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NW Washington | The chemistry of phosphorus in the soil is very complex and involves a lot of other factors like soil types, minerals, soil organic matter and the plant roots. Also, a good deal of the P your apply to a crop may not become available for a long time. I have read of test showing that only 10 percent of the plants P was from that applied at planting. It also could be that the deep band is too deep to come available or has less of the necessary chemistry to make it usable . Basically, I think what all this means is that you should try maintain a good, recommended P level in your soil and not try to goose up the crop with a little shot in or next to the seed row.
Here is some more info from the U of Minnesota and phosphorus in the soil and plants. http://www.extension.umn.edu/distribution/cropsystems/DC6795.html
Edited by JohnW 3/3/2010 02:53
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Deep band vs broadcast P
