Plant growth response to applied k on coarse‐textured feldspathic soils1
作者:
C. A. Seybold,
D. L. McCallister,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1990)
卷期:
Volume 21,
issue 7-8
页码: 531-545
ISSN:0010-3624
年代: 1990
DOI:10.1080/00103629009368250
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
An experiment was conducted to determine the influence of continuous cropping and K fertilization on plants grown on coarse‐textured soils high in feldspars. The A and C horizons of Elsmere (sandy, mixed, mesic Aquic Haplustoll), Valentine (mixed, mesic Typic Ustipsamment) and Sharpsburg (fine, montmorillonitic, mesic Typic Arguidoll) soils were continuously cropped in the greenhouse with annual ryegrass (Lolium multiflorumLam.). Four K treatments (0, 18.5, 37.5 and 75.0 mg K/kg soil) were applied before planting. At approximately 4 week intervals, above ground plant tissue was harvested and analyzed for K content for a total of 12 cuttings. Potassium deficiency symptoms (marginal necrosis, spotting) eventually appeared in plants grown on all but the A horizon of the Sharpsburg soil. Continuous cropping decreased plant K concentration, averaged across all treatments, from 38 to 10 g/kg dry matter. Potassium fertilization increased K concentration in plant dry matter on the soils initially low in slowly available and exchangeable K, but did not increase biomass. Uptake was higher by plants grown on A horizons. Different K rates resulted in different cumulative K uptake on the soils initially low in available K.
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