Spatial variation of soil test phosphorus and potassium, oxalate‐extractable iron and aluminum, phosphorus‐retention index, and organic carbon content in soils of Western Australia
作者:
M. D. A. Bolland,
D. G. Allen,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1998)
卷期:
Volume 29,
issue 3-4
页码: 381-392
ISSN:0010-3624
年代: 1998
DOI:10.1080/00103629809369952
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Spatial variation of bicarbonate soil test phosphorus (P) and bicarbonate soil test potassium (K) was studied by measuring soil test values for 40 individual soil samples collected from random locations within eight uniform 100 m by 100 m field sites in south‐western Australia. In addition, for five of the sites, spatial variation of the three P sorption indices (ammonium oxalate extractable iron, ammonium oxalate extractable aluminum, and the P retention index) and of organic carbon (C) was measured for 20 individual soils samples. Spatial variation was found to be large, with coefficient of variation (CV) exceeding 20% in most cases, and 50% in some cases. It is therefore essential to collect an adequate number of soil samples from uniform areas in paddocks in order to provide a representative composite sample to measure the soil properties.
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