Runoff Efficiency and the Technique of Micro-water Harvesting with Ridges and Furrows,for Potato Production in Semi-arid Areas |
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Authors: | Qi Wang Enhe Zhang Fengmin Li Fengrui Li |
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Affiliation: | 1.Cold and Arid Region Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou,China;2.Gansu Agricultural University,Lanzhou,China;3.The Laboratory of Arid Agroecology, School of Life Science,Lanzhou University,Gansu Province,China;4.State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation,Chinese Academy of Sciences,Yangling, Shaanxi Province,China |
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Abstract: | A field study was conducted to determine runoff efficiency and the effects of different ridge: furrow ratios and ridge-covering
materials on tuber yield, soil moisture storage and water use efficiency (WUE) in the ridge and furrow micro-water harvesting
system in a dry semi-arid region of China, during two consecutive years of 2002 and 2003. The average runoff efficiency of
ridges with compacted soil (SR) was very low (24.6–28.8%) compared to that of ridges covered with plastic film (MR) (91.1–94.3%).
The minimal rainfall necessary to produce runoff was 2.76–2.78 mm for SR, only 0.23–0.47 mm for MR. The field experiments
using potato as an indicator crop showed that tuber yields in the MR system were significantly higher than that in the flat
planting (control), with an average increase of 158.6–175.0% during 2 years. In the SR system, the average increase was valued
of 14.9–28.4% during 2 years. Regression analysis between tuber yields and ridge widths indicated the optimum ridge: furrow
ratio for MR was 39: 60 cm in 2002 and 48: 60 cm in 2003 respectively. The WUE values of potato in MR were 1.50 times greater
than that of the controls in 2002 and 1.62 times greater than the controls in 2003. No differences were found in the WUE between
the SR and the controls on average of 2 years. Due to the different runoff efficiency between two ridge-covering materials
and absence of runoff occurrence in the controls, the soil water content in the MR was higher than that in the SR, both of
which were greater than the controls. With the soil crust development, the distribution of soil water at the bottom of the
furrow, at the side of the furrow and at the top of the ridge, is similar between the SR and the MR. |
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Keywords: | Furrow Ridge Micro-water harvesting Runoff Tuber yields Water use efficiency |
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