China experiences severe soil erosion problems, as a result of population pressure and a lack of land suitable for cultivation. In the south-west province of Yunnan, heavy monsoonal rains, combined with the fact that 95% of the province is mountainous, create erosion problems. This is exacerbated by the common practice of cultivating steep slopes due to lack of flat land. The best way to minimise soil erosion in these circumstances is to devise cultivation practices that conserve soil loss without reducing crop productivity. Work was carried out to consider the effectiveness of contour cultivation (CC) and contour cultivation plus straw mulch (CC+SM), in relation to their effects on soil erosion and maize productivity. Results were compared to the traditional practice of downslope cultivation (D) on 3 slope classes 3, 10 and 27°. In a wet year CC significantly reduced soil loss on the 3° and 10° slopes and adding straw mulch gave no extra protection. On the 27° slope, CC was not effective, but CC+SM reduced soil loss by almost 100%. In 1999, a drier year, no significant treatment effects were found on the 3° slope, but CC significantly reduced soil loss on the 10 and 27° slopes. The addition of straw mulch gave no extra reduction on either of the steeper slope in 1999. There was a tendency for yields to be higher under CC+SM and in 1999 this difference was significant on the 10° slope.
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- Erosion Rates and Crop Productivity on a Red Soil Experimental Site in Yunnan Province
M. A. Fullen
T. J. Hocking
D. J. Mitchell
- Springer Netherlands
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