Download Advances in Agronomy, Vol. 27 by N.C. Brady (Ed.) PDF

By N.C. Brady (Ed.)

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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. Third, the availability of previously accumulated reserves can substantially protect yield during desiccation. They may also represent a potential resource for increasing yield under favorable conditions. Fourth, the physiological factors most likely to be limiting during one part of the season may be unimportant during another part of the season.

DRAGAN-BULARDA, AND D. RADULESCU cells, persisted in an adsorbed state. Toluene reduced urease activity by 3 3 4 9 % in tea soils (Bhavanandan and Fernando, 1970). According to Roberge (1968), toluene considerably diminished urease activity of both nonsterilized and 7-sterilized black spruce (Picea mariana) humus. , to an increase or to a decrease), but so does irradiation. The type of change is a function of soil and treatment dose (Thente, 1970). The four soils examined showed variable rates of urease activity with various doses of 7-irradiation.

6, 9-16. Claassen, M. , and Shaw, R. H. 1970a. Agron. J . 62, 649-652. Claassen, M. , and Shaw, R. H. 1970b. Agron. 1. 62,652-655. Croy, L. , and Hageman, R. H. 1970. Crop Sci. 10,280-285. Deckard, E. , Lambert, R. , and Hageman, R. H. 1973. Crop Sci. 13, 343-350. Eastin, J. A. 1969. Proc. 24th Annu. Corn Sorghum Res. C o n f . Amer. Publ. NO. 24, pp. 81-89. Frank, A. ,Power, J. , and Willis, W. 0. 1973. Agron. 1. 65, 777-783. Fry, K. E. 1970. Plant Physiol. 45, 465-469. Fry, K. E. 1972. Crop Sci.

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