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Season and phosphorus age effects on the relationship between maize yield and phosphorus soil test on a highly weathered soil



Season and phosphorus age effects on the relationship between maize yield and phosphorus soil test on a highly weathered soil



South African Journal of Plant and Soil 4(1): 21-25



This paper discusses data obtained from a long-term N, P, K field experiment with maize (Zea mays L.) on a Normandien clay loam (Plinthic Paleudult) near Newcastle, Natal [South Africa]. After eight seasons plots were split, sub-plots being allowed either to rundown or continuing to receive annual P applications. Soil samples were obtained shortly after fertilization each season and P soil tests were related to final grain yield. The results obtained indicate that although yield maxima varied from 3000 kg ha-1 in the dry 1981/82 season to over 6 500 kg ha-1 in the more favourable 1983/84 season, there was no meaningful difference in the optimum P soil test using either the Ambic, modified Truog or Bray 1 extractants. Furthermore, the relationship between yield and soil test was identical for residual P subplots and those which received annual applications of fertilizer P.

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Accession: 001679952

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