Using a chlorophyll meter to predict nitrogen fertilizer needs of winter wheat
作者:
R. H. Fox,
W. P. Piekielek,
K. M. Macneal,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1994)
卷期:
Volume 25,
issue 3-4
页码: 171-181
ISSN:0010-3624
年代: 1994
DOI:10.1080/00103629409369027
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Although it has been shown that the nitrogen (N) concentration of winter wheat(Triticum aestivumL. em Thell) at Feeke's growth stage 5 (GS 5) can be used to assist in making more accurate spring N fertilizer recommendations, the need remains to find a more convenient and accurate means for predicting N fertilizer needs of wheat. We conducted seven N fertilizer response experiments over two years in central and southeastern Pennsylvania to determine if chlorophyll meter readings of wheat leaves at GS 5 could predict whether a significant, positive grain yield response to N fertilizer would be obtained. The chlorophyll meter readings at GS 5 were more accurate (correctly predicting response to N fertilizer in 24 of 25 treatments for a 4% error rate) than GS 5 plant N concentration (20% error rate). There were too few treatments with a positive response to N fertilizer to be able to determine if chlorophyll meter readings could be used to accurately predict N fertilizer rates needed for economic optimum yield.
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