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

By N.C. Brady (Ed.)

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Sample text

In the absence of toluene the proliferating microorganisms metabolize a large portion of the glucose released from dextran through the action of the accumulated dextranase and the dextranase recently produced. Toluene prevents utilization of glucose (DriganBularda and Kiss, 1972b) (Fig, 3). 3. Decomposition of dextran in soil in the absence (-t) or in the presence (+t) of toluene. ( 1 ) Dextran solution; (2-8) different soils plus dextran; (9) glucose solution. ENZYMES ACCUMULATED IN SOIL 35 minimum sterilizing dose or with toluene showed the same value of dextranase activity.

Rddulescu Babes-Bolyai University, Clui-Napoca, Romania Introduction. Role of Accumulated Soil Enzymes in the Initial Phases of the Decomposition of Organic Residues and of the Transformation of Some Mineral Compounds A. Carbon Cycle.. B. Nitrogen Cycle.. C. Phosphorus Cycle.................................................. D. Sulfur Cycle.. 111. Enzymatic Activities in Soil under Conditions Unfavorable for the Proliferation of Microorganisms.. A. Physical Factors ...................................................

This suggests that in soils where available carbon is a limiting factor for microbial proliferation, added urea is hydrolyzed exclusively by the preexisting amount of urease. , 1973). This indicates that the activity should be ascribed to the accumulated urease. Another evidence of the existence of accumulated urease is the isolation of urease from soil in a crystalline form. The preparation was a mixture of proteins exhibiting urease activity (Briggs and Segal, 1963). Bums et al. (1972a,b) have isolated a clay-free organic soil fraction which showed urease activity.

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