TEST Soybean Irrigation Management

Trial Overview

  • Many farmers are faced with water restrictions and/or limited well10;capacity and need information on how to maximize soybean yield while using the10;least amount of water.

Research Objective

10;Location 10;
10;Soil Type 10;
10;Previous Crop 10;
10;Tillage Type 10;
10;Planting Date 10;
10;Harvest Date 10;
10;Potential Yield 10;
10;Planting Rate 10;
Gothenburg, NE
silt loam

10; Site Notes:10;

Five different irrigation treatments were tested10;plus a dryland control (Table 1): Full irrigation (FI) based on maintaining the10;soil water maximum allowable depletion above 40%, two treatments above FI to10;verify that full yield potential was actually achieved with 100% FI, and two10;treatments below FI initiated at R3 or R4.

Understanding the Results

Figure XX. Image Caption
  • No differences in yield were observed between10;the soybean products, so yields from the three products were combined for each10;treatment. However, the irrigation treatments did have a significant effect on10;yield.
  • Above average rainfall lead to relatively high10;yields in all plots. 20.7 inches was received from mid-April through July;10;however, rainfall in August and September was only 0.7 and 0.6 inches,10;respectively.
  • Timely irrigation of a total of 3 inches/acre10;starting at the R4 stage caused the 50% FI treatment to yield 97% of the 100%10;FI treatment while using 3 inches less water.

What Does This Mean for Your Farm

  • For10;those farmers with limited water supplies or allocations, a majority of the10;soybean yield can be captured if timely irrigation is made during the R4 growth10;stage.