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Abstract:
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(En)
Cultivation reduced the effectiveness for three fertilizers by 20 to 50 percent. The effectiveness of phosphorus (P) applied as superphosphate decreased with increasing period from time of application whereas the effectiveness of the rock phosphates increased but they were always much less effective than superphosphate. The relationship between grain yield and P concentration of plant tissue was similar regardless of fertilizer type, year of application of fertilizer, and whether or not the soil was cultited. Values of bicarbonate-soluble P for superphosphate treated soil were reduced by about 20 to 25 percent when the fertilizer was incorporated into the soil whereas the rock phosphate treated soils the values were little affected by cultivation. Concl
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