Amy Timmerman - Extension Educator

Amy Timmerman

faculty

Assoc Exten Educator NE Ext Engagement Zone 2 University of Nebraska–Lincoln

Work

128 N 6th St O'Neill NE 68763-1616

Work 402-336-2760

atimmerman2@unl.edu

vCard

Location: Holt and Boyd Counties

Accurately Growth Staging Corn after Lower Leaf Loss and Implication for Post-emergence Herbicide Application

May 29, 2020

After a frost, or hail event, the dead tissue is not able to resurrect itself and is eventually sloughed off as the plant continues to grow. Thus a common question is how do I determine corn growth stage when I can no longer count leaves?

emerging corn showing varying degrees of frost damage

Evaluating Freeze and Chilling Injury in Corn and Soybeans

May 13, 2020

The weather took a turn to the cold side over the last week. Across Nebraska, lows at or below 32°F were recorded. Clear conditions coupled with these temperatures favor frost formation especially in low lying areas. So, what does this mean for our crops?

Flooded field — **Figure 1.** Flooded crop fields in south-central Nebraska after heavy rains in 2019 caused growers to reexamine their options for fields already late planted or taken as prevented planting. (Photos by Sarah Sivits)

Crop Impacts and Options After Mid-season Flooding

July 2, 2024

After heavy summer rains have led to flooding in Nebraska, many farmers are facing concerns about how long crops can survive in standing water and implications for the remainder of the growing season.

Part of a row of corn struggling to survive — These plants, in a Clay County corn field, are in deep water and deep trouble! The bright vibrant greens of typical V2 to V3 seedlings are replaced with sickly yellows, indicating plummeting chlorophyll readings and photosynthesis. Roots of these oxygen-starved plants are no longer growing and are likely dying. The soil to which they are anchored has changed dramatically and full plant recovery is likely not possible. (Photos by Roger Elmore)

Corn Establishment and Growth in Saturated Soils: A Brief Review of New Research

May 31, 2019

How long can seedling corn survive under flooded conditions? A review of current scientific literature offers new understandings of when and how plant injury occurs and what factors affect it.

Figure 1. The degree of damage from standing water in this field will depend on several factors and likely will lead to direct yield losses or indirect losses from increased disease pressure.

Response of Germinating and Early Season Soybeans to Flooding

May 30, 2019

Injury to germinating and seedling soybean from flooding depends on several factors, including soybean growth stage, flood duration, and air and soil temperature and varies the varieties. Pythium and Phytophthora are two diseases to scout for after flooding.

Resistance Management Webinar Series Starts in January

December 7, 2018

The new “Resistance Management Webinar Series” starting this January will feature live presentations from guest speakers on current resistance issues and research. Continuing education credits will be available for certified crop advisers.

Figure 1. The degree of damage from standing water in this field will depend on several factors and likely will lead to direct yield losses or indirect losses from increased disease pressure.

Flooding and Ponding in Soybeans

June 22, 2018

Soybean plants are generally able to withstand a fair amount of flooding in the short term; however, diseases favored by wet conditions may become a problem for the rest of the season. Research shows the length of time the soil is wet and the type of soil will affect plant injury and survival.

Flooding and Ponding in Corn

June 22, 2018

Ponding or flooding of fields affects corn differently at different stages, depending on duration of flooding and other factors. Growers should assess the potential for nitrogen loss and increase scouting for corn disease in these fields.

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