[kirschenman]

In our high pH soils, I have generally found that MAP is about 8-12% efficient or available. In other words, if you apply 25 lbs. actual P, you are, in reality, getting about 2-3 lbs. available to the plant. With liquids, I find that we are getting 35-45% availability, so 10 lbs. liquid actual means 3.5-4.5 lbs. to the plant, and more evenly distributed.

I often see the 8-12% efficient comment. What that says to me is that you may need to wait 10 years after you switch from dry in order to actually see if you are mining the soil and if there is a yield response. If the efficiency is that poor, you are using the MAP applied a decade before with your current crop. And that doesn't make for good research.



Glad to see you talking about removal rates and applying dry for maintenance of P levels. Many liquid salesmen do not admit that.