Evaluation of three calcium extractants for coastal plain soils
作者:
A. K. Alva,
G. J. Gascho,
Yang Guang,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1990)
卷期:
Volume 21,
issue 1-2
页码: 29-47
ISSN:0010-3624
年代: 1990
DOI:10.1080/00103629009368213
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Mehlich 1‐Ca is used as an index to predict the Ca requirement for peanut (Arachis hypogaeaL.) fruit development in major peanut growing states. Recently, some concern has been raised about the inadequacy of Mehlich 1 extractable Ca for that purpose. Possible use of alternative extractants for soil Ca has been suggested. In this study, relationships among Mehlich 1, 0.2 M NH4Cl and 0.01 M NaNO3extractable Ca were examined in several Coastal Plain soils to which gypsum or lime had been applied. Variability in extractable Ca was much greater following lime treatment than following gypsum treatment. In Bonifay soil, the quantity of Ca extractable by the three extractants was similar in a gypsum treatment, but in a lime treatment (at an application rate equivalent to the gypsum treatment) Mehlich 1‐Ca was 2 and 5‐fold greater than NH4Cl‐ and NaNO3‐Ca, respectively. In Greenville soil, Mehlich 1‐Ca was 3 to 4‐fold greater than NaNO3‐Ca regardless of gypsum or lime amendment.
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