Fluctuations in soil test values for potassium as influenced by time of sampling1
作者:
WilliamC. Liebhardt,
M. R. Teel,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1977)
卷期:
Volume 8,
issue 7
页码: 591-597
ISSN:0010-3624
年代: 1977
DOI:10.1080/00103627709366750
出版商: Taylor & Francis Group
关键词: Potassium release;K equilibrium fertilizer recommendation;Kalmia sandy loam
数据来源: Taylor
摘要:
Soil samples were taken at frequent intervals in 1975 and 1976 from a factorial set of lime ‐K treatments initiated in December 1970 to determine the effect time of sampling has on K soil test values. Previous work at this site had shown wide fluctuations in K soil test values due to sample time thus necessitating a more detailed study than was previously made. Such information is necessary if accurate K fertilizer recommendations are to be made. Samples from 28 unfertilized plots showed that months of sampling significantly affected K soil test values. Soil test values for K were highest in late May and declined as the growing season progressed, remaining low until the relatively higher exchangeable K was re‐established the following spring.
点击下载:
PDF (212KB)
返 回