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SUBSCRIBESoil and Crops
fert. app/soil test levels
Post At
02/15/2010 - 5:32 pm
reply from
tom koppel
I have been basing my fertilizer applications on soil samples 6" deep. This on soils no tilled 15+ years. P levels 40#/a., K levels 210#/a. 90% of my fertilizer is broadcast, remainder is in-furrow. Soil samples @ 2"-3" are far, far higher. The question: Should I be basing my application rates on the 3" sample or continue to base it on the 6" sample? My primary crops are soybeans and small grains. Thanks for the help, Tom K.
Reply at
02/17/2010 - 8:25 am
reply from
arlan niehues
Your test levels for the top 3in are bound to be higher if you are broadcasting P &K. Your roots are growing downward pulling nutrients from deeper in the profile. The nutrients will move down thru the profile slowly. Some guys cut back or don't apply every year so in theory a layer of low fertility is moving down thru the profile. In notill it is important to be appling every year to keep the nutrient levels in check down thru the profile. Where you are growing soybeans and wheat you have quite a few roots in the top three inches but fertility is still important deeper in the profile
Hope that helps.
Hope that helps.
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