VRI - Impact of Irrigation Environment on DEKALB Corn Products

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TRIAL OVERVIEW

  • With the increase in limited irrigation due to reductions in pumping capacity or restrictions on the amount of water producers are able to pump over a certain period of time, it is imperative that Monsanto tests products under varying irrigation rates to supply better corn product recommendations by irrigation level.

RESEARCH OBJECTIVE

  • • The objective of this study was to evaluate the effect of various irrigation environments on the yield of DEKALB brand corn products.
Location Soil Previous
Crop
Tillage
Type
Planting
Date
Harvest
Date
Potential
Yield/Acre
Planting
Rate/Acre
Gothenburg, NE Hord silt loam Corn Convnetional 05/07/2017 11/01/2017 240 bu 34,000

SITE NOTES:

  • Eight DEKALB corn products with relative maturities ranging from 101 to 114 were evaluated under four irrigation rates: 100% full irrigation (100% FI) to meet the evapotranspiration needs of the crop and 70%, 50%, and 20% FI. Irrigation amounts for each treatment were 6.0, 4.2, 3.0, and 1.2 inches for the 100%, 70%, 50%, and 20% FI treatments, respectively.
  • The irrigation rates were achieved using a variable rate irrigation system installed on a linear move overhead sprinkler system.
  • The study design was a split plot with irrigation as the whole plot and two replications.
  • Rainfall totals: May 2.53 in., June 0.75 in., July 1.52 in., August 3.63 in., and September 2.4 in., totaling 10.83 in.

UNDERSTANDING THE RESULTS

 
Table 1. DEKALB corn product performance affected by irrigation environment (average of the two reps).
  • The corn products that provided consistent performance across all irrigation treatments were DKC55-20RIB and DKC60-87RIB brand blends (highlighted in Table 1).
  • DKC56-45RIB brand blend had consistent performance at the 70% and 50% FI treatments, but yield decreased significantly at the 20% FI treatment when compared to 100% FI (highlighted in Table 1).

WHAT DOES THIS MEAN FOR YOUR FARM?

  • Farmers should carefully consider corn product selection and seeding rate based on the irrigation capabilities in each field to help maximize their return.
  • Monsanto intends to continue these trials for the 2018 season.
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