我县引黄灌区是一个人多地少的地方,系稻旱两段轮作地区,灌排便利,土壤肥沃,增产潜力较大.为了发挥土地生产潜力,改一年一熟为稻旱两熟,在以往小面积试验成功的基础上,1972年全县有9个公社、80多个大队搞了稻旱两熟试验,面积达4,436亩,占全县水稻总面积的7%,比1971年1,700亩增长160.9%.虽然1972年气候反常,霜冻危害(晚霜迟于5月14日,早霜早在9月3日,枯霜在 Yellow River Irrigation District is a small area where more people, the Department of rice rotation rotation for two areas, irrigation and drainage facilities, fertile soil, yield potential greater .In order to play the land productivity, On the basis of the success of small-scale experiments in the past, there were 9 communes in 1972 and more than 80 brigades engaged in rice-dry and double-ripening experiments with an area of ​​4,436 mu, accounting for 7% of the total rice area in the county, compared with 1971 1,700 acres increased by 160.9%. Although the 1972 climate anomalies, frost damage (late frost later than May 14, early frost as early as September 3, Ku Frost