Suat Irmak – Distinguished Professor, Soil and Water Resources and Irrigation Engineering

Harold W. Eberhard Distinguished Professor of Biological Systems EngineeringSuat Irmak

Work Chase Hall (CHA) 239
Lincoln NE 68583-0726
Work 402-472-4865 On campus, dial 2-4865

Faculty Bio

soybean field

Planting Soybean after Soybean (Part 1): Planting Considerations

April 13, 2017
Farmers are increasing their soybean plantings for 2017, which likely means some are shifting to soybeans-after-soybeans. This article looks at what you should be considering at planting time as you consider changing your cropping sequence.

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Center pivot irrigated soybeans
Management in a successful soybean-after-soybean cropping system may require growers to make some slight adjustments in their practices, including irrigation, seed selection, and pest management.

Planting Soybean after Soybean (Part 2): In-Season Management Considerations

April 13, 2017

In Part 1 of this article, we look at considerations for planting soybean after soybean. In this article, Part 2, we share considerations for in-season management.

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Field trials comparing early and late planted rye cover crop
Field trials comparing early and late planted rye cover crop

Implementation of Cover Crops in Corn and Soybean Systems in Nebraska

November 29, 2016
A short review of cover crop research conducted at four University of Nebraska research fields (two irrigated, two dryland) to study the feasibility and impact of winter cover cropping on soil quality, soil water, and crop yields in corn-soybean systems. Objectives were to quantify cover crop emergence, fall and spring biomass production, soil water changes, soil chemical and physical property changes, and crop yields.

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Harvest 2016 — When Corn Yields are Below Expectations

October 14, 2016
A review of 2016 growing conditions across Nebraska sheds light on a number of factors that may have contributed to reduced yield in individual fields. An understanding of these factors may be helpful when selecting seed for 2017.

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Figure 1: Early-planted rye (left) and late-planted rye before corn at Concord, April 22, 2016.
Figure 1: Early-planted rye (left) and late-planted rye before corn at Concord, April 22, 2016.

Biomass Production of Winter Annual Cover Crops in Corn and Soybean

August 11, 2016
Rye was the leading biomass producer in the first two years of a four-year study exploring whether winter cover cropping in no-till corn and soybean systems in Nebraska can benefit soil quality despite their short growing season.

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Corn leaf rolling
Figure 1. One indicator of heat stress is when corn leaves roll in the early morning in areas where there is adequate soil moisture.

Impacts of Extreme Heat Stress and Increased Soil Temperature on Plant Growth and Development

June 21, 2016
Both corn and soybean are susceptible to extreme heat (and water) stress during early vegetative stages as well as later critical growth stages (pollination for corn and flowering for soybean). Extreme heat stress can reduce plant photosynthetic and transpiration efficiencies and negatively impact plant root development, which collectively can negatively impact yield. The author recommends that during an extended heat wave (air temperature equal to or greater than 90 F for 7-10 days), applying 0.25-0.40 inch of water can be very beneficial.

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