Planting Date Study

2017 Iowa Corn Planting Date Study

  • Iowa

The purpose of this study is to determine the optimum planting date window by planting on multiple dates throughout the growing season.

OBSERVATION

Determining proper timing for corn planting is one of the most critical decisions farmers make every spring. Our multi-location data has shown that the earlier you can get into the field, the better off you are and the higher yields you will achieve. Our data this year is an exception. The April 22 planting date was the second lowest when it came to yield, which was a result of the cold, wet conditions that came two days after planting. The May 30 planting date was our highest yielder. We attribute this to a two week stretch in early September that dropped daytime temperatures around 70°F and nights in the upper 50s, and added moisture. Slowing plant growth down delayed plant senescence, which extended our grain fill period.

 

2-YEAR OPTIMUM PLANTING DATE WINDOW

 

2017 RESULTS

 

STUDY INFORMATION

Planted Various | Harvested Various | Population 34,000 Seeds/A. | Row Width 30 in. | Previous Crop Soybeans | Tillage Fall: Chisel, Spring: Field Cultivation | Herbicides Pre: 3.5 oz. Corvus®, 1 lb. Atrazine Post: 3 oz. Capreno®, 1 lb. Atrazine | Insecticides Escalate | Starter 8.5 gal. 32-0-0 2x2 | Total Nitrogen 190 Units as UAN | Brand 6076SX | Soil Type Nevin (Silty Clay Loam) | Soil Test Values pH 6, O.M. % 3.6, CEC 14.2 | Percent Base Saturation Ca 51.1, Mg 19.4, K 4.1, H 25.4 | Parts Per Million P 40, K 225, S 4, Zn 3.8, Mn 52, B 0.2

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