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tillage in the western Loess Plateau
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ZHENG Li-na, WANG Xian-zhi, SHEN Yu-ying
[18]
(College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China)
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Abstract: The research presented crop yield, phosphorus dynamic for a wheat-soybean rotation systems affected by tillage management: conventional tillage (t), tillage+stubble retention (ts), no-till (nt), no-till+stubble retention (nts) in the Loess Plateau. Results showed that ten years tillage management implementation did not carry a yield penalty for winter wheat, soybean yield had a positive response to conservation tillage. Soil phosphorus content increased with the increasing of rotation sequences. Both total phosphorus and available phosphorus contents were increased at top 0-5 cm. Stubble retention increase crop phosphorus uptake, P contents in soybean grain under nts and ts treatnment were 111% and 82% higher than that under t treatment. The results provide a local agricultural implement provides certain theoretical guidance.
[20]
Key words: conservation tillage; total phosphorus; available phosphorus; phosphorus uptake; crop rotation
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