Effects of a one-time application of bentonite on soil enzymes in a semi-arid region

Soil enzymes play a key role in many soil processes that affect soil health and which may be adversely affected under a changing climate. We investigated the short- and long-term effects of bentonite amendments on soil catalase, invertase, urease, and alkaline phosphatase activity in a field experim...

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Bibliographic Details
Published in:Canadian Journal of Soil Science 2018-09, Vol.98 (3), p.542-555
Main Authors: Mi, Junzhen, Gregorich, Edward G, Xu, Shengtao, McLaughlin, Neil B, Liu, Jinghui
Format: Article
Language:English
Subjects:
activité des enzymes du sol
Alkaline phosphatase
application unique de bentonite
Arid environments
Arid regions
Bentonite
Catalase
Climate change
Deserts
Enzymatic activity
Enzyme activity
Enzymes
Invertase
Long-term effects
Millet
one-time bentonite amendment
Phosphatase
Plant growth
Semi arid areas
Semi arid environments
Semiarid environments
Semiarid lands
soil enzyme activity
soil health
Soil improvement
Soil investigations
Soil layers
Soils
Sustainable agriculture
Urease
vitalité du sol
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Summary:Soil enzymes play a key role in many soil processes that affect soil health and which may be adversely affected under a changing climate. We investigated the short- and long-term effects of bentonite amendments on soil catalase, invertase, urease, and alkaline phosphatase activity in a field experiment in a semi-arid region in northern China. Treatments included six rates of bentonite amendments (0, 6, 12, 18, 24, and 30 Mg ha-1) applied only once in 2011. Addition of bentonite had a significant (P < 0.01) effect on the activity of each enzyme at different layers and days after millet sowing. Observed increases in catalase, invertase, urease, and alkaline phosphatase activities were up to 42%, 46%, 58%, and 50%, respectively, and they were approximately linear with increasing bentonite rate up to 24 Mg ha-1 over the 5 yr experimental period. Averaged over 5 yr, the 24 Mg ha-1 rate of bentonite amendment led to the largest effect on soil enzyme activity in all soil layers at five growth stages over the growing season. The observed increased enzyme activity suggests that bentonite can help maintain and improve soil health to support plant growth and contribute to sustainable agriculture production in a semi-arid environment.
ISSN:0008-4271
1918-1841
1918-1833
DOI:10.1139/cjss-2018-0011