Season and phosphorus age effects on the relationship between maize yield and phosphorus soil test on a highly weathered soil
作者:
FarinaM.P.W.,
ChannonP.,
期刊:
South African Journal of Plant and Soil
(Taylor Available online 1987)
卷期:
Volume 4,
issue 1
页码: 21-25
ISSN:0257-1862
年代: 1987
DOI:10.1080/02571862.1987.10634230
出版商: Taylor&Francis Group
关键词: Fresh P;P×season interaction;P soil tests;residual P
数据来源: Taylor
摘要:
This paper discusses data obtained from a long-term N, P, K field experiment with maize (ZeamaysL.) on a Normandien clay loam (Plinthic Paleudult) near Newcastle, Natal. 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 3 000 kg ha−1in the dry 1981/82 season to over 6 500 kg ha−1in 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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