Phosphate sorption curves as a soil testing technique: A simplified approach1
作者:
J. P. Jones,
R. L. Fox,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1977)
卷期:
Volume 8,
issue 3
页码: 209-219
ISSN:0010-3624
年代: 1977
DOI:10.1080/00103627709366715
出版商: Taylor & Francis Group
关键词: phosphate sorption curves;single point curves;equilibrating solution;ionic strength;tropical soils
数据来源: Taylor
摘要:
Single point phosphate sorption curves effectively estimated phosphate fertilizer requirements while requiring less work than multiple point curves. Correlation coefficients of 0.961 and 0.981 were obtained when phosphate rates, estimated using single point curves, were compared with those from multiple point curves. Reducing the ionic strength of the supporting electrolyte solution by using 0.001 M CaCl2or water rather than 0.01 M CaCl2during equilibration increased dissolved inorganic phosphate 73% and 141% on the average thus improving analytical precision. The relative effects of salt concentration were sufficiently independent of pH and phosphorus concentration to suggest that a simple conversion factor can be used to convert external P requirements from one set of equilibrium conditions (salt concentration) to another.
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