Recommend changes for double-crop soybeans

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Putting in a crop of soybeans following wheat can really boost your income. Adequate moisture at planting, seeding rate, planting date and maturity are some important issues to consider before making the commitment. Rainfall in August and escaping an early frost are things we can’t control but are essential for a successful crop as well.

It takes a soybean plant around 90 days to reach physiological maturity. So, the first thing to consider is when the wheat crop is harvested and when is the first average frost date. I looked across the Midwest at different sites and the following is an average of graph’s I viewed.

First Average Frost

·         Nebraska, Iowa and Colorado                October 5- 10th

·         Kansas, Illinois, Indiana and Indiana     October 15-20th

·         Missouri, Kentucky and Boot Hill           October 20-25th

If we take Illinois for example, and use October 15th as a frost date you would subtract 90 days, which would put the target date for planting double crop soybeans on July 18th for the crop to reach maturity.

The biggest question I get with double crop beans is: “I am double cropping soybeans and will need an early variety.” This is not the case. We only have so many days for the crop to mature. Planting a medium to mid-late soybean will usually provide more height and yield. Taller plants set more pods which equals increased yields. 

Population and row spacing are other factors that can also gain yield. Higher population pushes the first pod on plant higher which will lead to combine cutting more harvestable pods. Planting into wheat stubble may dcasue the loss of a few soybeans, so seeding an extra 15-20,000 seeds will help stand establishment. Narrow rows for late planting are also a plus. Planting 30 inch row beans will not canopy and close the rows for better weed control. If you have a 30-inch row planter just double back and split the rows. Studies have shown a 15-20% yield increase in narrow rows with late planted soybeans.

In conclusion, there are several factors when deciding to plant a crop of soybeans after wheat.  If soil moisture is adequate and wheat harvest is timely, planting a crop of beans is a definite option for adding profit. There are variables we cannot control such as timely rains in August and frost. But planting a mid to fuller maturing soybean and increasing population are things we can control to increase yield potential.


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