The Effect of Phenyl Phosphonic Acid upon Yield, Grain/Straw Ratio and Nitrogen Uptake of Cereals.The investigations presented confirm positive effects of phenyl phosphonic acid upon grain/straw ratio obtained by other authors. This improvement however resulted from a decreased yield of straw and not from an increased yield of grain, and was not accompanied by reduction of straw length. It is therefore of no advantage. An increase in the yield of grain and increased nitrogen uptake reported by other authors due to the application of phenyl phosphonic acid were not confirmed by the results of the present study.
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