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Soybean Scouting (06/23/16)

A soybean survey project, called Benchmarking Soybean Production Systems in the North-Central USA, started during this past winter with questionnaires filled out by participating growers.

Soybean Scouting

A soybean survey project, called Benchmarking Soybean Production Systems in the North-Central USA, started during this past winter with questionnaires filled out by participating growers. The survey is part of a multi-state effort to evaluate what growers can do to improve soybean yields. Growers reported about their management of various soybean fields to provide data for this project. Graph 1 is indicating the distribution of the collected data. Throughout this summer, producers are providing information about their 2016 soybean field management and their fields are evaluated for established stand, nodulation, weed pressure, pests and diseases. The summer evaluation data is then compared to yield information provided by the producer after harvest.

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Graph 2 indicates that about half of the surveyed growers utilized post emergence herbicide strategies, whereas 43% of the growers utilized both pre- and post-emergence herbicides to control weeds.plsc.2

The second part of the graph indicates that 40% of the growers used insecticides, most likely to control soybean aphids and that 20% of the growers used fungicides. Decisions on use of pesticides should be based on the presence of insects or disease at threshold levels. Numerous studies, including data presented in Table 1, concluded that in the absence of disease, fungicide application may not increase yield. Due to the cost of the chemical and application, unnecessary use of pesticides may result in a lower net income per acre.

For the 2016 summer field observations, soybean roots are evaluated for nodulation (biological fixation of nitrogen) and other issues. Some roots show the presence of soybean cyst nematode as indicated with arrows in photo 1. Producers and consultants are encouraged to note if plants have cysts in order to prevent future yield loss by properly managing the soybean fields in the future. Management includes selecting tolerant soybean varieties, crop rotation with a non-host crop, and preventing the introduction of soybean cyst nematode into production fields.

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We are currently seeking 2016 soybean fields to evaluate this summer as part of this project to improve soybean yields in North Dakota. If you are interested, contact J Stanley at j.stanley@ndsu.edu.

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Hans Kandel

Extension Agronomist Broadleaf Crops

 

J Stanley

Soybean Survey Coordinator

 

This site is supported in part by the Crop Protection and Pest Management Program [grant no. 2017-70006-27144/accession 1013592] from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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