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

By N.C. Brady (Ed.)

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B. Chemical Factors.................................................. IV. Summary. References. I. 25 11. I. 27 27 38 58 64 64 64 69 16 76 Introduction Enzyme activity of soil results from the activity of accumulated enzymes and from the enzymatic activity of proliferating microorganisms. By definition, accumulated enzymes are regarded as enzymes present and active in a soil in which no microbial proliferation takes place. Their amount in terms of weight is very small. Sources of accumulated enzymes are primarily the microbial cells.

S. 1974. Plant Physiol. 53, 474479. Kerr, J. , McPherson, H. , and Talbot, J. S . 1973. Proc. Aust. C o n f . Heat Mass Transfer, Ist, 1973 Sect. 3, pp. 1-8. Kirkham, M. , Gardner, W. , and Gerloff, G. C. 1972. Plant Physiol. 49, 961-962. Kozlowski, T. , ed. 1968. “Water Deficits and Plant Growth,” Vols. 1 and 2. Academic Press, New York. Kozlowski, T. , ed. 1972. “Water Deficits and Plant Growth,” Vol. 3. Academic Press, New York. Kramer, P. J. 1969. ” McGraw-Hill, New York. McCree, K. J. 1974.

These experiments were not conducted with the aim to demonstrate directly the occurrence of p-lY3-glucanasein the soil. It seems probable that p-1,3-glucanase is produced in soil in localized zones near fungal mate- ENZYMES ACCUMULATED IN SOIL 33 rial which is being colonized by lytic microorganisms, and p-1,3-glucanase accumulation should take place in these zones. 10. Hydrolysis of Inulin Hydrolysis of inulin was found in toluene-treated soil and peat samples (Hoffmann, 1959; Kiss and PCterfi, 1961a).

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