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Studies conducted by R.J. Goos et al shared that wheat vegetative growth was more responsive to P than buckwheat, while buckwheat was somewhat more responsive to N than wheat. At harvest, both crops responded profitably to N. At four sites uncomplicated by drought or ponding, the average nitrogen uptake efficiency into the seed + straw was 50% for wheat versus 33% for buckwheat. At these same four sites, the average phosphorus uptake efficiency into seed + straw was 5% for wheat versus 17% for buckwheat. Wheat translocated most of its P to the seed, while little P was translocated to buckwheat seed. As a result, buckwheat straw contained a significant amount of P, as much as 38 lb P2O5/A. Buckwheat is more aggressive at taking up P from the soil than wheat, and returns almost all of the P taken to the soil.
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