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beta-Glucosidase and proteases activities as affected by long-term management practices in a Typic Argiudoll soil

Horra, A.M. de la, Conti, M.E., Palma, R.M.
Communications in soil science and plant analysis 2003 v.34 no.17-18 pp. 2395-2404
soil enzymes, proteinases, beta-glucosidase, enzyme activity, Argiudolls, agricultural soils, no-tillage, conventional tillage, grassland soils, pastures, soil organic matter, nitrogen content, carbon, soil fertility, Argentina
The objective of the present study was to determine the effect of tillage systems on the activities of enzymes associated with the carbon (C) and nitrogen (N) cycles (beta-glucosidase and protease) on a Typic Argiudoll (Marcos Juarez Series). The experiment was performed in a randomized complete block design with three replications under no till, conventional tillage and native pasture used as control soil. The activities of beta-glucosidase and protease, total N and oxidizable C contents were determined at depths of 0-5 and 5-15 cm. Not only the activities of both enzymes, but also C and N contents were greater in the native soil at both depths, which shows the impact of land use on this soil. The enzymatic activities in the surface of no-till soil were significantly higher than those for conventional tillage. At the 5-15 cm depth these variables did not present significant differences between tillage systems. The enzymatic activity was more sensitive to tillage systems than oxidizable C content in the first cm of the top layer. These results indicate that beta-glucosidase was a more sensitive index of management effects than protease.