Interactions between calcium amendments and phosphate on the response of alfalfa and barley growing on acid soils
作者:
Y.K. Soon,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1988)
卷期:
Volume 19,
issue 7-12
页码: 1343-1353
ISSN:0010-3624
年代: 1988
DOI:10.1080/00103628809368017
出版商: Taylor & Francis Group
关键词: Aluminum;gypsum;liming response;phosphorus;soil solution;Hordeum vulgareL.;Medicago sativaL.
数据来源: Taylor
摘要:
Alfalfa (Medicago sativaL. cv Peace) and barley (Hordeum vulgareL. cv Otal) were grown in the greenhouse on three moderately acid soils (pH 4.7 to 5.1). Calcium amendments consisted of adding CaCO3to achieve pH values of 6.0 and 6.7, or CaSO4(gypsum) equivalent in Ca to CaCO3to attain pH 6.7, and a check (nil Ca). Three P treatments were superimposed on each Ca treatment: O, 30 and 60 mg P kg‐1soil. Dry matter yields of both alfalfa and barley were increased by CaCO3and not affected by CaSO4. Phosphate increased yields although soil test P values were medium to high. There was a strong CaXP interaction. The yield increase due to CaCO3and P additions was greatest for the soil with the least amount of soil test P and organic matter, and relatively small when the soils were limed from pH 6.0 to 6.7. Liming reduced Al concentration and ‐increased P concentration in the soil solution. Gypsum increased Al concentration and had variable effects on solution P concentration. Soil solution P concentration and soil pH accounted for 85 percent of the yield variations in barley.
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