| Effects of conservation tillage on soil enzymatic activities in rainfed wheat field |
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| DOI：10.7606/j.issn.1000-7601.2009.01.02 |
| Key Words: conserv ation tillge soil enzymatic activities no-tillage straw covering |
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| Abstract: |
| Based on conserv ation tillage experiment in Dingxi of Gansu， effects of conv entional tillage and five conservation tillage patterns， namely，conventional tillage(T )，conv entional tillage W ith st ubble incorpo-
rating(TS)，no till with no stubble(NT)，no till with stubble retention(N TS), conventional tillage w ith plastic
film mulching(TP) and no till w ith plastic film mulching(NTP) on soil enzy matic activities and grain yield in the rainfed farming system w ere studied. T he results show ed that soil Catalase activity w as reduced with the in-censement of soil depth. The activities of U rease，Alkaline phosphates and Invertase in T ,TS and TP treatments decreased from the soil profile of 0~5 cm to 5~ 10 cm and increased from 5~10 cm to 10~30 cm，while de-creased in NT，NTS and NTP treatments from soil surface to deep soil layers. Compared with T treat ment，NTS treat ment can improve Catalase, Alkaline phosphatase and Invertase by 11.7%，17.60% and 43.99%, respectively. For grain yield, it is the highest in NTS treatment，being 1.68 times higher than that in T treat-
ment . Therefore， no till w ith st ubble ret ention w ould not only improve grain yield, but also can improve soil en-zymatic activities. |
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