By N.C. Brady (Ed.)
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Extra info for Advances in Agronomy, Vol. 28
Work on the effect of age was conducted in two separate experiments by Greenwood and Titmanis (1966); the results have been brought together and reexpressed in Fig. 6. Over the first 5 weeks after emergence, a given concentration of total nitrogen in the youngest fully expanded leaf of the tiller gives a fairly constant estimate of SNR. Thereafter the predicted value of stress falls. For ninhydrin nitrogen, the two experiments gave inconclusive results. , 5-6 weeks at the most. No precise work has been recorded on the effects of either the composition of the nitrogen source or the relative supply of other nutrients on the regression of SN on leaf nitrogen.
The data have been presented here because of the rare insight they give into the sensitivity of leaf elongation under a variety of seasonal conditions. For example, soil water measurements showed that the fertilized plots contained 2-8 cm less water in the root zone in late May than did the check plots. This could account for the negative response to nitrogen obtained at that period. The dry matter responses obtained (to be published by Power elsewhere) reflected the variation in leaf elongation rates.
Agric. Anirn. Husb. 9, 329-340. , Greenwood, E. A. , and Dowling, E. J. 1972. Aust. J. Biol. Sci. 25, 1147-1 156. Chapman, H . , ed. 1966. ” Div. of Agric. , Univ. of California. Goodall, D. , and Gregory, F. G. 1947. Cornrn. Bur. Hort. Plant. Crop (G. ) Tech. Cornmun. 17. Greenwood, E. A. N. Plant Soil 24,279-288. Greenwood, E. A. , and Titmanis, Z. V. Plant Soil 24,379-389. A. , and Titmanis, Z. V. Aust. J. Agric. Res. 19,9-14. Greenwood, E. A. , Goodall, D. V. Plant Soil 23,97-116. Greenwood, E.