|
Soybean
Insect Management
Wheat
Resource Management
Alfalfa & Forages
Field Updates/Resources
AgNews
|
![]()
|
Soybeans are in the R3 stage (beginning pod elongation) when there is a 1/4-inch pod in at least one of the four uppermost nodes of the soybean plant (i.e., count down from the top node -- the fully expanded leaf). There may be a few open flowers near the stem tip, but not many. Don't worry about pods lower down in the plant, Specht said, because irrigation-induced yields come from pods in the upper third of the plant. The R3 stage usually occurs in late July or early August for soybeans planted in mid May.
Irrigation is critical during the 8-10 days soybeans are in stages R3.0 to R4.0 (pods in upper four nodes reach 3/4 inch in length) and should continue after that as rainfall conditions dictate. Waiting for rain or not irrigating enough during this period can lead to reduced yields. In 15 years of NU research, heavy irrigation during pod elongation always led to large yield responses, Specht said.
Soybeans can benefit from irrigation through early September, he said.
"A lot of people shut off the water on soybeans too soon, when they're finished with their corn," he said. "Soybeans can actually use water for one more week. This is critical for some farmers." For further information, see Irrigating Soybean, NebGuide G1367.
Soybean aphid alert
Significant field infestations of soybean aphids have now been reported in Adams, Dawson and
Stanton counties. Soybean producers should be watching very closely for signs of infestation.
The June 20, 2003 CropWatch includes a comprehensive story on soybean aphid identification, scouting and management.
Keith Jarvi
IPM Extension Assistant, Northeast REC
This year's profit-making topics will include:Soybean Management Field Days
Don't forget to put these dates on your calendar and plan to attend this year's Soybean Management Field Day. The theme for this year's presentations and demonstrations is Soybeans American Style: Using Innovation and Experience to Increase Profitability.
Check the next issue of CropWatch for more detailed information or visit the NU Soybean Management Field Days site at http://ardc.unl.edu/soydays.htm
Two species of spider mites, the Banks grass mite and twospotted spider mite, commonly feed on Nebraska corn. Banks grass mites feed almost exclusively on grasses, including corn and sorghum. Twospotted spider mites not only feed on many species of grasses, but also on soybeans, fruit trees and a variety of vegetables and ornamental plants. Although these two species are somewhat similar in appearance, they differ in several biological characteristics and in their susceptibility to pesticides.
Banks grass mites usually appear earlier in the season, feed mostly on the lower leaves of the corn plant, and in Nebraska are moderately susceptible to many of the commonly used miticides. On the other hand, twospotted spider mites tend to appear in mid to late season, increase rapidly, feed over the entire plant, and often are not consistently controlled by available pesticides. The most useful characteristics for identification are the overall shape of the body and the pattern of pigmentation spots on the back (see figure). The dark green spots on both species are caused by food particles that accumulate in their gut. Because of differences in gut structure, these pigment spots accumulate in slightly different patterns. In Banks grass mites the pigments accumulate along both edges of the body near the rear and along the sides of the body. In twospotted spider mites, the pigments accumulate along the sides of the body in two distinct spots and do not extend back more than halfway on the body. The Banks grass mite is also slightly less robust than the twospotted spider mite and is slightly flatter from top to bottom.
Mites damage crops by piercing plant cells with their mouthparts and sucking the plant juices. The first evidence of mite feeding, which can usually be seen on the top of the leaf, is a yellow or whitish spotting of the leaf tissues in areas where the mites are feeding on the lower leaf surface. Because many other things can cause similar discoloration, it is important to check leaves closely to make sure mites are actually causing the damage. Leaf discoloration caused by mite feeding can be easily identified by checking the undersurface of leaves for the presence of mites, eggs and webbing. Both Banks grass mites and twospotted spider mites produce webbing, and a fine network of silken webs will likely be associated with mite colonies. A magnifying glass or 10X hand lens is helpful in examining plants for mites.
Management
The economic injury level indicated in the table provides a method for deciding when to treat, taking into account the value of corn. This table works for both twospotted spider mites and Banks grass mites. The first row refers to the expected value of the crop ($/acre), determined by multiplying the expected yield (bu/acre), by the expected crop price ($/bu). For example, if the expected yield is 200 bu/acre and the expected price is $1.50/bu, then the value per acre is $300.
Deciding whether to treat involves two steps. First, determine the percentage of leaves infested with mites (an infested leaf has one or more live mites). Compare that number with the first number in the table. If the field average is less than the table value, you don't need to treat, but do continue to monitor the field. If the field average exceeds the table value, then estimate the percentage of total leaf area damaged by mites. If the field average exceeds the table value, it is likely that treating for spider mites will increase yield above the cost of treatment.
Also, note that control costs are a factor in this table. Depending on the product chosen, the critical values may change greatly. For example, under the column $300 market value, the critical value for percent infested leaves varies from 20%, if control costs are $10, to 49% if control costs are $25.
Products labeled for spider mite control on corn include dimethoate (several formulations), Comite 6.55EC and Capture 2EC. Dimethoate has performed reasonably well in Nebraska against Banks grass mites, but not twospotted spider mites. If twospotted spider mites are present, either Comite or Capture would provide better control. See the Department of Entomology web site on spider mite control or product labels for specific rates and restrictions. With the exception of Comite, pesticides do not kill mite eggs, and there is a possibility of re-infestation of the fields as eggs hatch out. Since many of their natural enemies were probably killed by the initial pesticide application, these populations may build up rather quickly and should be monitored carefully. Corn is unlikely to benefit from treatment for spider mites after the dent stage.
Twospotted spider mites also may develop on soybeans. No research has been conducted that would allow calculation of an economic injury level for twospotted spider mites on soybeans. Iowa State University Extension specialists have suggested that control may be warranted when infested plants have substantial spotting or leaf yellowing and live mites, but before mites cause browning and leaf drop. Damage from mites may be confused with that caused by drought and several foliar diseases, so be sure to base treatment decisions on the presence of mites, rather than just apparent injury symptoms.
Fields may be spot treated if the infestation is localized, but check other areas for mites (especially downwind of infestation) and extend treatments into these areas if large numbers of mites are found. Although late season infestations may accelerate soybean senescence and increase pod shattering, use caution when evaluating whether to treat with pesticides because many of the pesticides used for mite control have 21-28 day preharvest intervals
. Products to use in soybeans include dimethoate (several formulations) and Lorsban 4E at 0.5 to 1 pint per acre. See the NU Department of Entomology web site or product labels for specific rates and restrictions. For more information see the UNL Cooperative Extension publication, Spider Mite Management in Corn and Soybeans, G1167.
Bob Wright
Extension Entomologist
South Central Ag Laboratory
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Use corn rootworm scouting numbers
as basis for production decisions in 2004
|
There are no thresholds for silk-clipping damage based on beetle numbers because damage levels are not correlated well with beetle densities. Usually an average of at least 10 beetles per ear are required to seriously affect pollination. Severe silk feeding at 25-50% pollen shed may indicate the need to apply an insecticide, especially in seed production fields. Visit the NU Department of Entomology web site for a list of insecticides labeled for adult rootworm control.
Traditionally we have talked about the value of rootworm beetle scouting to determine the need for insecticides the next year if a field is to be planted back to corn. With the registration of YieldGard Rootworm corn, beetle scouting also can be used to determine where it would be most profitable to use this technology. Unlike European corn borers, we can predict where the greatest likelihood for rootworm injury will be, and beetle scouting information from this summer can be used to target placement of transgenic corn hybrids next year for rootworm control.
|
Start scouting for corn rootworm beetles soon after beetle emergence begins and continue scouting weekly until threshold levels are exceeded or beetle activity stops. Examine 50 plants per field, taking samples from each quarter of the field. Sampled plants should be several paces apart, so that examining one plant doesn't drive beetles off of the next plant to be sampled. The most reliable method is to examine the whole plant for beetles. Beetles may hide behind leaf sheaths or in the silks, so care is required to observe all beetles present. An alternative method is to check for beetles only in the ear zone (the area including the upper surface of the leaf below the primary ear and the under surface of the leaf above the primary ear).
In continuous corn if beetle counts exceed 0.75 beetle per plant, damaging populations of corn rootworms are possible in that field next year. In first year corn, there is a higher proportion of female beetles, so the threshold is lowered to 0.56 beetle per plant. These thresholds are based on a 24,000 plant population per acre. The number of beetles per plant to equal a threshold level should be adjusted for different plant populations (see table or NebGuide G86-774, Western Corn Rootworm Soil Insecticide Treatment Decisions Based on Beetle Numbers). If the ear zone method is used for scouting, divide the above thresholds in half, since on average only 50% of the beetles on a plant are counted using this method.
In fields with insect levels over the threshold, consider rotating out of corn, planting a transgenic corn active against rootworms or plan to use an insecticide at planting or cultivation to prevent economic damage. Fields remaining below the threshold level throughout the beetle egg-laying period are not expected to have economic populations of rootworms next year.
Individuals using adult beetle control programs should begin treatments when the beetle threshold is exceeded and 10% of the female beetles are gravid (abdomen visibly distended with eggs). This is an important point since the first beetles to emerge are mostly male, and females require at least 10-14 days of feeding before they can lay eggs. Treatments applied too early may be ineffective if large numbers of females emerge after the residual effectiveness of the treatment has dissipated. Continue to monitor fields weekly after treatment for rootworm beetles. If beetle numbers exceed 0.5 beetles per plant, retreatment is warranted. Late maturing fields are particularly susceptible to corn rootworms moving into them from nearby earlier maturing fields. A complete discussion of adult corn rootworm management can be found in Corn Rootworm Management (EC1563).
Bob Wright
Extension Entomologist
South Central Ag Laboratory
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Scout for mid-summer chinch bugs in grain sorghum
|
Growers in southeast Nebraska should be checking for chinch bugs throughout their fields, not just the area bordering wheat or small grains. Chinch bugs feed at the base of the plant, but also may hide behind the leaf sheaths in the heat of the day. Chinch bugs are a threat to sorghum during three stages: the seedling stage when chinch bugs are present because of poor or late control of grasses like volunteer wheat; when wheat or oats ripen and chinch bugs move to nearby grain sorghum or corn fields; and when the second generation flies to infest grain sorghum.
According to KSU entomologists, “Unless spot treatment can be used, the size of the area infested must be compared to the cost of treating the entire field. Consider using field- wide treatment with ground-applied sprays for midsummer infestations in fields where infested spots (averaging about 50 bugs/plant where plant size is from about 1 foot in height through the flowering stages) are equivalent to about one acre infested in each seven acres of field size.” To think about this in terms of percentages, this is equivalent to the infested spots (as defined above) equaling 14% or more of the field.
A variety of foliar insecticides are labeled for control of chinch bugs in grain sorghum, including Sevin XLR (1-2 quarts per acre), Furadan 4 F (1 pint per acre), Warrior 1EC (2.56-3.84 fl oz per acre), Mustang (3.4-4.3 oz per acre), Baythroid 2EC (1.3-2.8 oz per acre) and Lorsban 4E (1-2 pints per acre). Higher spray volumes provide improved control because the sprays must penetrate the canopy to reach where chinch bugs feed on the lower part of the plant.
See the label or the NU Department of Entomology Web page, Insecticides for Chinch Bug Control in Sorghum, at http://entomology.unl.edu/instabls/chinchbg.htm for information on rates and restrictions for these products.
Bob Wright
Extension Entomologist
South Central Ag Lab
Adult blister beetles vary in size and color but can be recognized by elongated, narrow,
cylindrical and soft bodies. When viewed from above, they have a constriction behind the head
where it attaches to the narrowed anterior end of the thorax. Several species of blister beetles are
common to Nebraska and pose varying degrees of problems. In Nebraska, the three-striped, gray
and black blister beetles are the most common. The three-striped is long, slender, brown and
yellowish-gray with yellowish stripes. The gray is a larger beetle that is 9/16 inch to 11/16 inch
long. The gray coloring is due to a thick covering of hair. The black blister beetle is the largest of
the three species. It is more robust and is 5/8 inch to 7/8 inch long.
Adult blister beetles can generally be found in alfalfa through the second and third cuttings and
some years into the fourth cutting. Horses are particularly susceptible to blister beetle poisoning.
Part or all of a horse's digestive tract can be severely irritated, leading to secondary infections and
bleeding. Cantharidin is absorbed and excreted through the kidneys, thus irritation of the kidneys,
ureter, urinary bladder and urethra could be followed by secondary infections and bleeding. The
substance also lowers serum calcium levels and causes damage to heart muscle tissue.
Researchers estimate that the minimum lethal dose of cantharidin is about 1 mg/Kg body weight
of a horse. The lethal dose for cattle may be as low as 0.5 mg/Kg body weight. Consequently, a
few beetles with a high cantharidin level would kill a small horse, but quite a few with a low
level would be required to kill a larger horse. About 1700 black blister beetles would be needed
to kill an 825-pound horse, but only 120 three-striped blister beetles. However, only 40
three-striped blister beetles would kill a 275-pound colt. As little as 4-6 grams of dried beetles
can be fatal to a horse.
Management
Toxicosis by blister beetles is related to simultaneous cutting and crimping of hay when beetles
are present. If hay is cut with a sickle bar or rotary mower and not crimped, the beetle can leave
the hay after it is cut. If the beetles are not allowed to escape, the trapped beetles die and are
incorporated into the hay.
Scout fields, particularly in border areas, for the presence of blister beetles and if found, treat
with a short residual insecticide before cutting. Insecticides approved for use on alfalfa can be
found on the UNL Department of Entomology web site.
When selecting a pesticide, read the label to determine harvest restriction intervals. Kansas State
University doesn't recommend blister beetle treatment because the dead beetles, which are still
toxic, remain in the field. Other recommendations include not using crimpers on hay intended for
horses and cutting alfalfa in the bud stage because blooms attract blister beetles.
It is difficult to eliminate the possibility of blister beetles in alfalfa, but carefully examining the
hay being fed to horses may help detect their presence.
Jack Campbell
Presence of stinking smut or common bunt in harvested grains is easily detected by a distinctive
objectionable fishy odor to the grain and by the presence of bunt/smut balls mixed in with the
healthy grain. With common bunt the normal kernel is replaced by a bunt ball containing a
black, sooty, powdery mass of fungal spores enclosed by the seed coat. The bunt balls are easily
ruptured during combining and the black spores on seed can be detected in grain samples.
Harvested grain has an overall dusty, grayish-black appearance.
Smut-contaminated grain causes a total economic loss since nothing can be done with it. Feeding
is not an option. Although it isn't toxic to livestock, i.e. hogs, they won't eat it because of the
unpalatable odor and poor kernel quality. Even diluting it with noncontaminated grain doesn't
seem to improve hog acceptance. It definitely can't be used for seed for fall planting or stored
with clean grain. About the only option is to bury it.
The common bunt in these incidences was brought about by growers saving their own seed for
planting and not treating the seed with a fungicide prior to planting. Losses are easily prevented
by not saving grain for seed but rather by using certified seed every two to three years and by
having the seed treated with a fungicide by a commercial seed conditioner prior to planting.
Seed treatments such as Raxal MD, MD Extra or ET; Gaucho XT; Dividend XL or XL RTA or
Baytan effectively prevent common bunt and loose smut. Uniform application is important, so
they are best applied by a commercial seed treater.
John WatkinsBlister beetles numerous in alfalfa
Blister beetles (Epicauta spp.) are very common this year and alfalfa producers should be on the
alert as they prepare for the next cutting. The increase in blister beetles is likely because
immature blister beetles feed on grasshopper eggs, which are plentiful this year. Blister beetles feed on a plant's flowers and leaves, but usually cause little damage. They can
create a serious problem, however, for the animals that consume them. Blister beetles contain a
lipid soluble blistering agent called cantharidin, which causes blisters on skin tissue upon contact
and can severely irritate an animal's digestive tract, especially a horse's system.
Extension Entomologist
West Central REC
Keith Jarvi
Extension IPM
Northeast REC
Wheat growers: Be alert to smut, quality issues when selecting seed for 2004
Common bunt, or as it is sometimes called, stinking smut can be a producer's nightmare when it
shows up in harvested grain. The immediate effect is elevator rejection of the grain. The delayed
effect is saving back contaminated seed and having a worse problem next year. We have had two
samples in the disease clinic and one report of common bunt in wheat this month. In all cases the
grain was rejected by the local elevator.
Extension Plant Pathologist
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
NU’s Plant and Pest Diagnostic Clinic exists to provide accurate and timely identification of plant diseases, weeds, and insects. Anyone can submit a sample to the clinic for analysis and, for a nominal fee, receive a detailed report in return. The clinic’s goal, said Jennifer Chaky, NU Extension plant pathologist, is to help people manage landscape and crop problems.
“We want to provide them with as much information as possible,” Chaky said. To do that, she said, she needs as much information about a particular sample as she can get.
“We try to assess the whole situation,” Chaky said. “We really talk to the person that brings in the sample to get some really good information on fertility, variety, cropping history, and any chemicals that have been applied. Using that information, along with what I find in the lab, we can give them a good diagnosis and some management information they can use either this year or in following years.”
Chaky stresses the importance of delivering good quality samples to the lab. Methods for obtaining and delivering quality samples of both plants and insects will be demonstrated during the Aug. 1 “Market Journal Extra.” Other guests scheduled to appear on the program include Loren Giesler, NU Extension plant pathologist; and Jim Kalisch, Extension entomologist.
On Friday, August 1, “Market Journal Extra” will be broadcast on the Dish Network’s University House Channel (NAUHS) 9411, at 1:30pm Central Time. The program also will be available via satellite (NEB*sat channel 102), and the public is invited to view the program at Cooperative Extension offices in the following Nebraska counties: Boone, Cass, Holt, Madison, Saunders, Sioux, Valley, Washington, and York. In Lincoln, “Market Journal Extra” can be seen on Time-Warner Cable channel 21. Audio and video clips from the program will be available on the Market Journal Web site.
Some commonly used insecticides that will devastate pollinators if applied to blooming crops or
weeds include: Furadan F, Penncap-M, Sevin WP, Lorsban EC, Cygon, Guthion and Malithion.
For further information, see the NU NebGuide, Protecting Bees When Using Insecticides
(G98-1347) or contact Marion Ellis, extension entomologist, at (402) 472-8696 or email
mellis3@unl.edu.
Seedbed preparation and planting can be done several ways. Some turnip growers work soil like
a fully prepared alfalfa seedbed. Others heavily disk their ground, but leave it fairly rough, while
a few spray Roundup or Gramoxone on wheat or oat stubble to kill weeds and then plant no-till.
Whatever method you choose, good early weed control is essential. Turnips do poorly if weeds
get ahead of them. Once started, however, turnips compete well. Since no herbicides are labeled
for turnips, weeds must be controlled either by tillage or by using contact herbicides like
Roundup or Gramoxone before planting. Then plant quickly to get the turnips off and running
before the weeds get a chance to come back.
Plant only 1 to 3 pounds of turnip seed per acre. Turnip seed is very small, so barely cover it. If
the seed is drilled, just scratch the surface with the openers. Simply broadcasting seed onto tilled
soils works well for many growers, especially on rough seedbeds where rainfall washes soil on to
the seeds for soil coverage. Then wait. With a few timely rains you will have excellent green feed for October, November, and December.
Bruce Anderson
The critical factor in most fields, though, is water. Last year the drought dried up nearly all
dryland alfalfa. And it's probably happening again. Good rainfall this spring was sufficient to
support early growth, but little or no moisture reached deep into the subsoil, which was
completely dried out last year. Now when it gets really hot and dry and alfalfa needs extra
moisture, there is none to spare. And there is nothing you can do about it, so don't waste time
and money trying. Just cut when plants recover from the last cut and there is enough to justify a
harvest.
Irrigators can apply more water for more yield, but remember that with temperatures in the 90s,
it takes 7 to 8 inches of water to pro-duce a ton of hay.
With high temperatures, alfalfa plants suffer, growth rates decrease and moisture stress is common, even in moist soil. Those trying to grow high-quality hay also will be challenged when temperatures don't drop at night. High night-time temperatures cause rapid
metabolic rates in alfalfa, burning off valuable nutrients that plants
accumulated during the day. This often produces alfalfa hay with fine
stems that contain high protein, high fiber and low
relative feed value.
Another problem is that when it's hot,
alfalfa may begin to bloom in less than four weeks. Many growers use
blooming as a signal to harvest, so this early blooming can be misleading.
Alfalfa plants need more time, not less time to rebuild nutrient reserves
in their roots during hot weather because they burn off nutrients instead
of moving them to the roots.
You also may need to adjust time of day when you cut your hay. When
hay in the windrow stays above fifty percent moisture, plant cells continue
to respire, burning away valuable nutrients. Hay cut late in the day will
respire all night long, losing yield and quality. Some research has shown
that cutting in late afternoon produces higher quality hay than cutting in
the morning. However, it still may be wiser to cut in the morning on good
drying days if plant cells can dry and be stabilized before nightfall.
Producing and storing high quality hay is challenging under the best of conditions. Both you and the weather
must cooperate and even then there are no guarantees.
Bruce Anderson Learn tips for submitting plant and pest samples on Aug. 1 Market Journal Extra broadcast
The mission and methods of the University of Nebraska’s plant and pest diagnostic clinic will be discussed at length on the August 1 “Market Journal Extra,” a bi-monthly, 30-minute television program produced by NU Cooperative Extension and the Institute of Agriculture and Natural Resources.Protect pollinators when spraying for grasshoppers
With grasshopper numbers on the rise, farmers and ranchers may be spraying ditches with
insecticides and inadvertently killing beneficial insect pollinators. When scheduling
applications, consider plant growth stage and peak activity periods for pollinating insects.
If bloom is not present, precautions are not warranted. If bloom is present, applications should
be as late in the day as possible, and short residual products should be selected. Synthetic
pyrethroids, such as Asana, are good products when bloom is present; however, they should be
applied in the late evening. The insecticide Dimilin can be applied any time without harming
pollinators.Plant turnips for winter grazing
Planting turnips into wheat or oat stubble can provide a high quality pasture for late fall and early
winter grazing and pay big dividends for growers. Turnips can provide good grazing beginning in October and often lasting into the new year. Turnips also are cheap to plant since seed can cost less than $5 per acre.
Extension Forage Specialist
Some alfalfa struggling
Despite good yields from first and most second cuttings of alfalfa, stands in many areas now are
struggling to grow. Even irrigated fields aren't doing so well. Several factors may be affecting
production, some of which you may be able to change. Potato leafhoppers have turned many fields yellow and these fields will not grow well again until that yellow growth is cut off. Grasshoppers and other insects also are feeding on alfalfa in many areas and need to be controlled if it's economically feasible.
Extension Forage Specialist
The kits will be demonstrated at upcoming field days and in September will be available for checkout at 16 extension offices. Counties offering kits are: Box Butte, Boone, Brown, Cass, Cuming, Custer, Dixon, Gage, Holt, Lincoln, Merrick, Perkins, Phelps, Scotts Bluff, Washington and York. Among other items, each kit includes a measuring wheel, a platform scale, an electrical conductivity meter for checking salt concentration of liquid manure, rain gauges for sprinkler applications, and instructions and forms for calibration. They also will have some sampling supplies for manure nutrient testing, DeLoughery said. For more information, consult the NU Nebraska's Comprehensive Nutrient Management Planning Web page. |
"By attending both morning and afternoon sessions, participants will receive Nebraska Department of Environmental Quality land application training education credits," DeLoughery said. "These are required of livestock producers who have received a new or updated livestock waste control facility permit since April 1998."
Dates, locations, additional topics and contacts are:
Registration is $30 for the full day or $20 for the afternoon field program. The morning program begins at 10:30 a.m. with registration at 10 a.m. Lunch will be provided at noon to all participants. The afternoon program begins at 1 p.m. and will end by 3:30. Space is limited for the morning programs. To pre-register, call the local contacts listed above at least two days before the event.
For more information, consult the NU Nebraska's Comprehensive Nutrient Management Planning Web page. The event is partially funded by the Nebraska Environmental Trust and Cooperative Extension in NU's Institute of Agriculture and Natural Resources.
Sandi Alswager
IANR News and Publishing
|
Field day participants will hear updates on major interdisciplinary NU research on carbon sequestration, or storage, in irrigated and dryland cropping systems. Tours will feature the state-of-the-art field research facilities scientists use to measure and study how much carbon is stored under different crop management schemes.
This research is designed to answer practical as well as scientific questions about carbon sequestration in the different farming systems of Nebraska and the north-central United States, said Shashi Verma, a UNL micrometeorologist who co-leads the interdisciplinary team. Steadily increasing atmospheric concentrations of carbon dioxide, a major greenhouse gas associated with global warming, are driving interest in storing more carbon in cropland. Utilities or other companies might pay farmers to store carbon in their soil in exchange for credit toward their carbon dioxide emissions.
"This is a chance to provide information on what carbon sequestration is, how it's measured and monitored, and how it's affected by crop and soil management practices," said Ken Cassman, project co-leader and head of UNL's Agronomy and Horticulture Department. "We'll explain how the net benefits from carbon sequestration are tightly linked to other aspects of crop production that maximize profitability and minimize environmental concerns." While much more research is needed, preliminary results point to the potential to boost carbon storage and crop yields.
"We can say that our initial results indicate substantial potential to increase the amount of carbon recycled to soil while also achieving high yields and high crop input efficiency," Cassman said. Field day presentations include: agriculture's contribution to greenhouse gas mitigation; the need for low-cost carbon sequestration monitoring; the potential for carbon sequestration, renewable energy and environmental protection; market mechanisms to support carbon sequestration; and sequestration considerations in the U.S. Department of Agriculture's environmental quality initiative.
The field day is designed for a wide audience, including crop producers, policy-makers, commodity groups and industry representatives. Attendance is limited because of space, Cassman said, but if more than 150 people register by the Aug. 1 deadline, the team will organize a second field day. For more information about the field day, contact Maribeth Milner at (402) 472-0503, mmilner1@unl.edu. More information about the research is available online at http://csp.unl.edu/public/index.html.
"Nebraska is ideally situated for this research because it sits at the intersection of major continental climate zones where both irrigated and rainfed cropping systems are common," Verma explained. "This provides a wide range in (crop) productivity and carbon sequestration potential."
Event sponsors are USDA's Consortium of Agricultural Sciences for the Mitigation of Greenhouse Gases, Nebraska Corn Board, Nebraska Soybean Board and NU's Institute of Agriculture and Natural Resources.
Vicki Miller
IANR Science Writer
![]() |
About Crop Watch |
Agricultural News |
Events |
Archives |
Markets Ag Links | Weather | Photos | Search Lisa Jasa, Crop Watch Editor | Publications | IANR |
![]() | ||
| Published by University of Nebraska Cooperative Extension in the Institute of Agriculture and Natural Resources Cooperating with the counties and the U.S. Department of Agriculture | ||
| The University of Nebraska-Lincoln does not discriminate on the basis of gender, age, disability, race, color, religion, marital status, veteran's status, national or ethnic origin, or sexual orientation. | ||