Lime-phosphorus interactions in the growth of temperate pasture species on highly-weathered soils
作者:
MilesN.,
EckardR.J.,
期刊:
South African Journal of Plant and Soil
(Taylor Available online 1991)
卷期:
Volume 8,
issue 4
页码: 200-205
ISSN:0257-1862
年代: 1991
DOI:10.1080/02571862.1991.10634834
出版商: Taylor&Francis Group
关键词: Acid soils;liming;nutrient interactions;phosphorus fertilization
数据来源: Taylor
摘要:
Lime and phosphorus (P) requirements for the growth of temperate pasture species on acid, well-drained soils in the Natal Midlands were evaluated in factorial field trials. Species studied were white clover (Trifolium repens), tall fescue (Festuca arundinacea) and Italian ryegrass (Lolium multiflorum). All three species exhibited large yield responses to lime and P. In addition, evidence for both positive and negative lime-P interactions was present in dry matter production data. Positive interactions, exhibited during the establishment phase of growth of white clover and Italian ryegrass, appeared to be restricted to conditions of severe P deficiency. Yield data of all species contained evidence of negative interactions, which occurred at more favourable levels of P supply. Negative interactions reflect a decrease in response to P with increasing lime supply (to salt pH values of approximately 5.5). The latter interactions are of major importance from a practical standpoint since they imply a‘trade-off’between lime and P in pasture production. Consideration is given to the role of soluble Al in the development of lime-P interactions, as well as to factors possibly responsible for a noted lime-induced yield depression in the case of white clover.
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