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Nitrate reductase activity as an indicator for assessing the nitrogen requirement of grass crops
Author(s) -
BarAkiva A.,
Sagiv J.,
Leshem J.
Publication year - 1970
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740210803
Subject(s) - nitrate reductase , nitrogen , chemistry , agronomy , nitrate , substrate (aquarium) , yield (engineering) , biology , ecology , materials science , organic chemistry , metallurgy
The enzymic nitrate reduction capacity of leaves, which is defined as the rate of response to the inducing stimulus of externally added NO 3 substrate to incubated leaf fragments, is proposed as a measure for assessing the nitrogen fertilisation requirement of grass crops. The assay was tested in an annual ryegrass field experiment plot, where the effect of increasing N levels was studied. The rate of response diminished from 11 to 1 and was negatively correlated with the yield and NO 3 concentration in the leaves.