Seasonal variation in foliar composition of black walnut trees
作者:
Felix Ponder,
RobertE. Phares,
RichardC. Schlesinger,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1979)
卷期:
Volume 10,
issue 12
页码: 1513-1521
ISSN:0010-3624
年代: 1979
DOI:10.1080/00103627909367006
出版商: Taylor & Francis Group
关键词: Foliar sampling;Juglans nigra; foliar N;P;K;Ca;and Mg
数据来源: Taylor
摘要:
Leaf samples were collected from upper and lower crown positions at three times during the 1971 and 1972 growing seasons for planted black walnut (Juglans nigraL.) trees on the Kaskaskia Experimental Forest in Hardin County, Illinois. The average dry weight of leaves was affected by crown position and time of year. Foliar concentrations of N, P, K, Ca, and Mg were affected by season, but not by crown position. The content of all elements tested and the concentrations of Ca and Mg increased with season while concentrations of N, P, and K decreased as the season progressed. Suggestions for sampling dates are given.
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