Phosphorus with Darek Kouma

October 24, 2019

10.24.19 | P is for Phosphorus from Central Valley Ag on Vimeo.

One of our most yield limiting nutrients in Midwestern crops is phosphorus, which is why it is one of the most common nutrients we focus on when we test soils.  When we use grid or zone-based soil sampling to assess our variability, phosphorus is one of the nutrients we focus on the most.  

At Central Valley Ag (CVA), we really like to see the soil test P in the 20-30 ppm range.  When we fall below that range, we tend to see more yield reductions we can associate to phosphorus deficiency. For our soils that are already in that range we focus mainly on replacing the nutrients removed in crop harvest. For corn, we normally plan on each bushel removing around 0.4 pounds of P2O5 per bushel.   For soybeans, that number grows to around 0.8 pounds per bushel we harvest.  

Because both yield and past fertilizer practices have varied tremendously over the years, we see a lot of opportunity to gain both yield and reduce fertilizer costs by matching our application rates of phosphorus fertilizer to match the needs of specific field areas.  

Besides application rate, we also like to talk to growers about products, placement, and timing. Placing some phosphorus close to the roots of small plants early in the growing season is generally a good practice to increase early plant growth and health. Product depends a lot on a grower’s system. If a grower is set up to work with liquid, 10-34-0 is a great way to band larger amounts of P fertilizer.  If broadcast dry fertilizer fits their system, either Micro Essentials SZ or MAP is going to be the preferred product.  

Talk to your CVA Field Sales Agronomist for more information on how we can become more efficient in our phosphorus application.  
 

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Posted: 10/24/2019 8:17:16 PM by Kelli Reznicek | with 0 comments


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