The precipitation regularity on Weibei highland is analyzed

and the results are as follows.(1) The annual precipitation was statist ically in accordance with normal distribution with a probability of 80% in ≥450mm precipitation and eight-year-cycle and twenty-year-cycle in time.(2) The distribution of monthly precipitation follows the equation: Y=0.0291 x 5The precipitation regularity on Weibei highland is analyzed

and the results are as follows.(1) The annual precipitation was statistically in accordance with normal distribution with a probability of 80% in ≥450mm precipitation and eight-year-cycle and twenty-year-cycle in time.(2) The dist ribution of monthly precipitation follows the equation: Y=0.0291 x 5-0. 8737 x 4+8. 9185 x 3-37. 277 x 2+72. 661 x-40. 575

R2=0. 9354.(3) The rainfall events often occurred during May to October a year

the highest rainfall was in July with alow variation. On the basis of the results

four techniques for improving rainfall utilization efficiency are put forward

firstly

basic building of farmland and soil fertiliza ion

secondly

preservation water with less tillage and mulch

thirdly

drop irrigation and micro-irrigation with mulch

fourthly

integrated controls of desolate mountains with rain collect ion planting.-0.8737 x4+8. 9185 x 3-37. 277 x 2+72. 661 x-40. 575

R2=0. 9354.(3) The rainfall events often occurred during May to October a year

the highest rainfall was in July with a low variation. On the basis of the results

four techniques for improving rainfall utilization efficiency are put forward

firstly

basic building of farmland and soil fertilization

secondly

preservation water with less tillage and mulch

thirdly

drop irrigation and micro-irrigation with mulch

fourthly

integrated controls of desolate mountains with rain collection planting.