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淮河流域有效灌溉面积占耕地面积的比重,已由建国初期的5％左右提高到目前的59％,早涝保收及实灌面积已占耕地面积40％以上。据统计资料,1949年至1985年间全流域累计实灌面积为157000万亩(按每亩增产粮食50公斤计算,三十七年来因灌溉增产约7850多万吨),其中63000万亩是1978—1985年灌溉的,对淮河流域近期粮食大幅度增产(全流域粮食总产量目前已达6000万吨)起了很大作用。根据对各省近几年粮食亩产及实灌率(实灌面积占耕地面积的百分率)关系的统计分析,发现粮食亩产与
The proportion of the effective irrigated area in the Huaihe River Basin to the cultivated land area has risen from about 5% in the early days of the founding of the People’s Republic of China to the present 59%. The area for conservation and early irrigation and actual irrigation has occupied 40% of the cultivated land area. According to statistics, the total actual irrigation area of the whole basin was 1.57 billion mu between 1949 and 1985 (50 kg grain yield per mu was calculated, and about 78.5 million tons was boosted by irrigation in 37 years), of which 630 million mu Irrigated in 1985, it has played a significant role in boosting the recent grain output in the Huaihe River Basin (the total grain output in the entire basin has now reached 60 million tons). According to the statistical analysis of the relationship between the grain yield per mu and the actual irrigation rate (the percentage of actual irrigated area to the cultivated land area) in various provinces in recent years, it was found that grain yield per mu