By N.C. Brady (Ed.)
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Additional info for Advances in Agronomy, Vol. 27
Laboratory studies of Watkins et al. (1972) indicated that volatilization losses of NH, were high, ranging from 6 to ENZYMES ACCUMULATED IN SOIL 43 30% of the urea N applied to bare mineral soils and 27 to 46% for mineral soils covered by forest floors. Such differences probably were related to higher urease and microbial activity and/or to differences in physical structure of mineral soil and forest floor. To prevent the undesirable effects of excessive urea hydrolysis in soil it is necessary to diminish the urease activity.
J. 63, 56-62. Salter, P. , and Goode, J. E. 1967. ” Commonw. Agr. , Farnham Royal, Bucks, England. Schneider, G. , and Childers, N. F. 1941. Plant Physiol. 16, 565-583. Singh, T. , and Paleg, L. G. 1973. Aust. I . Biol. Sci. 26, 77-86. Slayter, R. 0. 1969. “Physiological Aspects of Grain Yield” (J. D. ), pp. 53-83. Amer. SOC. Agron. and Crop Sci. SOC. , Madison, Wisconsin. Stewart, C. R. 1971. Plant Physiol. 48, 792-794. , Waldron, L. , and Ulrich, A. 1971. Planta 97, 281-289. Upchurch, R. , Peterson, M.
For example, cell elongation is affected by quite normal diurnal fluctuations in plant water status, while net photosynthesis requires considerably greater desiccation, and translocation is even less sensitive. The implications of this extend beyond 18 J. S. BOYER AND H. G. MCPHERSON the breeding and management of cereal crops themselves. For example, the effect of desiccation in crops where the economic yield is vegetative is likely to be greater than in grain producing crops during the grain-filling stage.
Advances in Agronomy, Vol. 27 by N.C. Brady (Ed.)