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Effect of time of application of fertiliser nitrogen on the distribution and identity of the nitrogenous constituents of young apple trees
Author(s) -
HillCottingham D. G.,
Cooper Denise R.
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.2740210402
Subject(s) - asparagine , arginine , glutamine , nitrogen , chemistry , phloem , amino acid , botany , biochemistry , horticulture , biology , organic chemistry
The initial response to an application of fertiliser N appeared always as a rise in the level of asparagine. Following spring and summer N applications this high level of asparagine later decreased as those of arginine and the insoluble N increased, but after autumn N application both asparagine and arginine accumulated, especially in the roots. Leaves were exceptional both in containing a high proportion of insoluble N at all times and in containing a large amount of soluble glutamine soon after spring N application, in addition to the arginine and asparagine. Direct analyses have been transformed on to a weight basis and the results are given diagrammatically as the total weight of N present in each tissue of the tree as each of the four components: insoluble N, soluble arginine, soluble asparagine, or the total of all other soluble compounds. This has enabled the movement of N within the whole tree and the interchange between compounds in response to season and to fertiliser application to be recognised more readily. The possible significance of the relative mobilities of arginine and asparagine is also discussed, together with the possible merits of sampling leaves or other tissues, for example the roots, for predicting the future crop potential of apple trees.