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Soil Syst. 2018, 2(2), 21;

Influence of Tillage Practices, Organic Manures and Extrinsic Factors on β-Glucosidase Activity: The Final Step of Cellulose Hydrolysis

Departamento de Producción Agraria, Universidad Politécnica de Madrid, Av. Puerta de Hierro 2, 28040 Madrid, Spain
Scotland’s Rural College, West Mains Road, Edinburgh EH9 3JG, UK
The James Hutton Institute, Invergowrie, Dundee DD2 5DA, UK
Author to whom correspondence should be addressed.
Received: 12 March 2018 / Revised: 5 April 2018 / Accepted: 6 April 2018 / Published: 10 April 2018
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β-glucosidase is a key enzyme in the C-cycle, and its activity is strongly influenced by soil management practices and by extrinsic factors such as weather conditions. However, the variability of β-glucosidase activity (BGa) over time and how this variability is affected by tillage and organic fertilization remain poorly elucidated. We investigated how contrasting tillage practices (zero, minimum, conventional or deep) and organic amendment application (dairy cattle slurry or green compost) govern BGa. Strong correlations (r = −0.98; p < 0.001) were found between BGa and preceding cumulative rainfall for soil without crops. Under cropped soil conditions, BGa was 53% greater under zero and minimum tillage than under ploughed treatments (p < 0.05) six years after their applications. These differences could be explained by associated effects of tillage on organic matter content, electrical conductivity and water stable aggregates. The separated organic residue experiment showed that BGa was 36% greater in soil amended with slurry than in soil amended with compost (p < 0.05) five years after their applications. Finally, the response ratio of BGa was calculated in order to study the effect size of each treatment at each sampling period. This simple strategy mitigated the variation on BGa measurements between two sampling periods, and may be applied in future studies to improve the interpretation of other potential soil quality indicators that are sensitive to seasonal changes. View Full-Text
Keywords: zero tillage; organic amendments; slurry; compost; C-cycle zero tillage; organic amendments; slurry; compost; C-cycle

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Mariscal-Sancho, I.; Ball, B.; McKenzie, B. Influence of Tillage Practices, Organic Manures and Extrinsic Factors on β-Glucosidase Activity: The Final Step of Cellulose Hydrolysis. Soil Syst. 2018, 2, 21.

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