Twenty-five years of phosphate and potassium fertilization of a crop rotation |
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Authors: | Stanley A Barber |
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Affiliation: | (1) Agronomy Department, Purdue University, 47907 West Lafayette, In, USA |
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Abstract: | Effects of rate and placement of phosphate and potassium fertilizers was studied using a 4-year rotation of corn (Zea mays L.), soybeans (Glycine max L.), wheat (Triticum vulgare L.) and hay (later changed to corn). Yields increased with increased P until 22 kg P ha–1 yr–1 was applied. Yields increased with increased K applications to 140 kg K ha–1 yr–1. Broadcast P applications gave high yields than row applications. Crop response to P was affected more by soil P level than by application to the specific crop. Residual effect from K fertilizer applications did not last as long as the residual effect from P application. Soil tests for available P were closely correlated with rate of P application over the 25-year period. Soil tests for P were higher where P was banded where P was broadcast indicating less tie-up of P by the soil where less mixing occurred.Journal Paper No. 7910, Purdue University Agricultural Experiment Station. |
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Keywords: | fertilizer placement plant analysis P soil test Zea mays Triticum vulgare residual P |
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