High Yield Irrigated Soybean Management Strategies

Trial Overview

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  • Soybeans are an exceptional rotational crop for13;10;corn.  However, consistent higher soybean13;10;yields are desired by many farmers. 
     
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  • With this in mind, two research trials were13;10;conducted evaluating which components such as fertility and crop protection products13;10;in a soybean system have the  greatest13;10;effect on increasing  irrigated soybean13;10;yield. 
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Research Objective

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  • The purpose of the first13;10;study (High Management) was to evaluate the effects of manageable inputs on an13;10;irrigated soybean crop. An additional study (Nitrogen Fertility) was conducted13;10;to evaluate the application of nitrogen (N) on soybean yield potential.
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13;10;Location 13;10;
13;10;Soil Type 13;10;
13;10;Previous Crop 13;10;
13;10;Tillage Type 13;10;
13;10;Planting Date 13;10;
13;10;Harvest Date 13;10;
13;10;Potential Yield 13;10;
13;10;Planting Rate 13;10;
Gothenburg, NE (High Management)
Silt Loam
Corn
Strip-till
04/25/2016
09/23/2016
90
160,000 to 220,000
Gothenburg, NE (Nitrogen Fertility)
Silt Loam
Corn
Strip-till
05/06/2016
09/27/2016
90
160,000
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13;10; Site Notes:13;10;

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High Management. The first soybean study (High Management) evaluated several high yield13;10;management practices and was planted on April 25, 2016. It was a randomized13;10;complete block design with four replications. At the strip-till timing, the low13;10;management treatment had 10 gallons of 10-34-0 applied on April 15, 2016. All13;10;other treatments had 23 gallons of 10-34-0, and 8.4 gallons of 12-0-0-26S13;10;applied on April 15, 2016 (Table 1).Nitrogen Fertility. The second soybean study (Nitrogen Fertility) was planted on May 6,13;10;2015 and evaluated the effects of inoculation and fertilization. The study was13;10;a randomized complete block design with six replications. A fertilizer13;10;application of 10 gallons of 10-34-0 was made April 15, 2016 to provide a base13;10;rate of phosphorus (Table 2).
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Understanding the Results

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  • In the High Management Study, treatment 7 with the additional fungicide plus13;10;the previously added management factors and treatment 8 with the increased13;10;seeding rate had significantly greater yields than the low management treatment13;10;and provided the most yield benefit (Table 3).
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  • No fertilizer treatment increased yield in either13;10;study (Table 3 and Table 4). These results are similar to 2015. Even though the nitrogen13;10;management study was specifically placed in an area with low residual nitrogen13;10;in 2016, there was still no observed yield benefit. Reasons for this could be13;10;one or both of the following factors. 
         --High13;10;organic matter level in the soil of 2.8% which allows for the mineralization of13;10;nitrogen over the growing season. 
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         --Additional13;10;nitrogen applied through the pivot in the irrigation water of approximately 1513;10;lbs/acre.
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  • In addition, soil type may have a significant effect13;10;on whether late-season nitrogen applications influence yield. No soil effect13;10;was observed at the Gothenburg Learning Center on our silt loam soils; however,13;10;a positive impact may be observed on soils with high clay content.
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What Does This Mean for Your Farm

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  • To13;10;reach the high end range of yield potential for soybeans, soybean crop needs13;10;should be evaluated on each field.  High-yielding soybeans come from13;10;managing yield-reducing factors such as disease, insects, irrigation, weeds,13;10;nutrient deficiency, and cultural practices. 
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