Yield of alfalfa as influenced by levels of P and K fertilization
作者:
Dale Smith,
R. D. Powell,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1979)
卷期:
Volume 10,
issue 3
页码: 531-543
ISSN:0010-3624
年代: 1979
DOI:10.1080/00103627909366916
出版商: Taylor & Francis Group
关键词: P percentage;P removal;K percentage;K removal;Cl percentage;Cl removal;stand survival
数据来源: Taylor
摘要:
This study was conducted to ascertain further the need for P and K fertilizers to obtain maximum herbage yields from alfalfa (Medicago sativaL.). Vernal alfalfa was established on a low K Piano silt loam (Typic Argiudoll) soil and topdressed with zero, 22.4, and 44.8 kg/ha of P in autumn of seeding year and with zero, 224, and 672 kg/ha of K as KC1 each autumn. The harvest schedule was three cuts annually at first flower; a schedule widely recommended in the North Lake states. No statistical significance was found for P levels nor for the P x K interaction; significance was found only for K levels. Maximum herbage yield was obtained with 224 kg/ha of K in the first harvest year, but with the 672 kg/ha of K rate in the second harvest year. Herbage K and Cl percentages and amounts removed from the soil increased significantly each year with each increase in K applied. Herbage P and N percentages were decreased significantly with the first increment of K. Residual herbage yields showed dramatically the influence of K fertilization on winter survival. All alfalfa stands with no K fertilization were killed completely. Residual yields and stands increased with each increase in K applied. Yield increase over the control was significant only with the second increment of K, while stands increased significantly with each increase in K applied. These data continue to confirm that high levels of soil K are needed for stand survival as well as for high herbage yields.
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