Fertilizer

Nutrient Management Suggestions for Corn Updated in EC117 July 9, 2019

The Nebraska Extension Circular, Nutrient Management Suggestions for Corn (EC117), has been updated to account for residual soil nitrate-N and provide an alternative for determining fertilizer-P rates.

Drone equipped with sensors to read nitrogen levels — Figure 1. Nitrogen sensors can be used in drones, high-clearance rigs, or hand-held devices to determine how much in-season N may be needed following a wet spring. (Photo by Laura Thompson)

In-season Nitrogen Management for Corn in 2019 June 12, 2019

Spring weather has complicated nitrogen management this year, making in-season nitrogen application necessary in many fields. You can estimate N needs with the Late Spring Soil Nitrate Test or by use of crop canopy reflectance sensing, both of which are addressed here.

Figure showing reductions in nitrification based on temeprature. — Figure 1. Reductions in nitrification over time based on temperature.

Anhydrous Ammonia Conversion April 18, 2019

The environmental conditions allowing for anhydrous injury in 2018 are different then what we are experiencing this year. This brief looks at factors affecting the conversion from ammonia to usable soil nitrate.

Figure 1. When making decisions for your farm, check out some of the on-farm research results from 2018 to see what other growers learned.

Extension Releases Results from 2018 Farmer-Conducted Research April 12, 2019

An online database of results from the Nebraska On-Farm Research Network allows users to search and filter data from over 800 Nebraska on-farm research studies dating back to 1990.

More on Nutrient Management for 2019 April 11, 2019

This article addresses nitrogen application options for corn and availability of P and K from land-applied grain and fodder damaged by flooding. It supplements the previous article, Nutrient Management Issues for 2019.

Graph showing hypothetical illustration of variability of N loss.

Overall Efficiency of Fertilizer Nitrogen Use for Corn Production in Nebraska April 3, 2019

How well are we managing N fertilizer in corn and where can we improve to increase economic and environmental benefits.This article looks at sources of N fertilizer losses, input efficiencies and other factors.

Nutrient Management Issues for 2019 March 29, 2019

The impact on soil nutrient availability after the March snowmelt/heavy rainfall event is highly variable. The following describes what to consider in areas of little, moderate, and severe harmful effects.

Figure 1. Graph showing average (1998-2009) cumulative NO3-N loss in response to interaction effects of N treatments

Poultry Manure Reduces Nitrate Loss to Water in Iowa Study March 6, 2019

Iowa State University researchers concluded from a long-term field study that poultry manure, when applied at a rate to meet crop nitrogen (N) requirements, can reduce nitrate loss and achieve equal or better yields in corn-soybean production systems.