Soybean Pre-Plant Fertility Tips Video

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Planting soybeans soon?

Learn two pre-plant soil fertility tips for 2020 from Dr. Luke Gatiboni, NC State University’s new Extension Specialist in Soil Fertility in this new video:

It’s almost time to plant soybeans in North Carolina. We have two tips for our growers regarding soybeans and soil fertility. The first tip is regarding pH. Soybeans require a pH of 6.0, and if you have a pH below 6.0 it’s time to apply lime. Except for organic soils, where the target pH will be 5.0. We also can have some problems in North Carolina with very high pH.

Availability of different soil nutrients at varying pH levels.

Availability of different soil nutrients at varying pH levels.

In some soils, especially when we apply poultry litter for a long time, we can have pHs higher than 6.8. And in this case we probably can have problems with manganese deficiency. So be aware if you have a very high pH you can have a manganese deficiency during the soybean crop season.

Manganese deficiency in soybean. NC State.

Manganese deficiency in soybean. NC State.

The second tip that I have for you is regarding phosphorus. Most of the soils from North Carolina are very high in phosphorus.

Graph showing no yield response with an application of fertilizer when the P index is over 70

If your soil test report has a P index of at least 70 no yield response will occur

And if you have a phosphorus index that is higher than 70, you won’t have any response to phosphorus fertilization. So, don’t throw away your money with phosphorus if you have a phosphorus index higher than 70.

Written By

Jenny Carleo, N.C. Cooperative ExtensionJenny CarleoArea Specialized Agent, Agriculture - Grain Crops Serves 19 CountiesBased out of IredellCall Jenny Email Jenny N.C. Cooperative Extension, Iredell County Center

Contributing Author

Luke Gatiboni, N.C. Cooperative ExtensionDr. Luke GatiboniExtension Soil Fertility Specialist and Assistant Professor Call Dr. Luke Email Dr. Luke Crop & Soil Sciences
NC State Extension, NC State University
Posted on Apr 6, 2020
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