Runoff generation characters of mini-size water collection by ridges and furrows in semiarid area of Loess Plateau and related potato-planting techniques

Abstract

Abstract: Ridges and furrows rainfall harvesting(RFRH)system with plastic film and compacted soil is being promoted to increase the water availability for improving and sustaining agricultural production in northwest China.This system was built by shaping soil surface with alternated ridges and furrows along contours.Employing straight-line regression analysis method,this paper studied the runoff generation characters of mini-size water collection by ridges and furrows in the semiarid area of Loess Plateau and related potato-planting techniques.The results showed that the minimal rainfall necessary to produce runoff was 2.83 mm for the ridges with compacted soil(SM),and 0.23 mm for those covered with plastic film(MR),with an average runoff efficiency of 24.6% after runoff occurred for SM,and of 91.1% for MR.The tuber yield of MR30,MR45,MR60,SR30,SR45 and SR60 was increased by 173%,168%,119%,28%,24% and 18%,respectively,and water use efficiency was increased by 3.98,3.74,2.25,1.10,0.93 and 0.72 kg·mm^-1·hm^-2,respectively,compared to the control(no ridges).Ridges covered with plastic film could increase the tuber yield by 119%～173%,while those with compacted soil could increase the yield by 18%～28%,compared to the control.

Key words: Alfalfa, Dry matter yield, Yield characteristics, Diversity

CLC Number:

S157

WANG Qi, ZHANG Enhe, LI Fengmin, LI Fengrui, XU Changlin. Runoff generation characters of mini-size water collection by ridges and furrows in semiarid area of Loess Plateau and related potato-planting techniques[J]. cje, 2005, (11): 1283-1286.

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