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Callao, Missouri | I kick this around quite a bit.
Right now I fertilize like you, for corn or wheat, I also add what the beans call for.
But people in the know tell me that things like P get tied up in my clay soils, thus the ideas about banding, etc.
So if I am putting on crop removal for two years, and a large portion of it is unavailable to the plant, am I putting on enough?
If I did have to put on more to compensate for this, would this increase in $$ outweigh the added cost of spreading every year, and not utilizing the N from the MAP?
Almost all of my ground is extremely low in P. So in following the build recommendations from the University, do I simply add the rec. for corn and beans? Or are these rec. made based off a yearly application?
Sample Farm:
pH 5.3
OM 2.7%
CEC 14.8
Available P: 5lb/Acre
Available K: 147lb/Acre
Calcium: 3082lb/Acre
Magnesium: 329lb/Acre
The rec. is for 60bu. soybeans: 0-110-135
For 150bu. corn: 170-130-90
So it would need 0-240-225 in P and K. That's about $240/acre when taking into account the value of the N in the MAP.
Will these recommendations decline after I lime this farm?
By the way, who is the 'they' that wants you to spread more than two years worth of P and K? Is it going the way of the land market ("they're not making anymore of it!")?
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P&K fertilizer questions
