根据气象专家预测，我国在未来几十年内，气候可能趋于变暖，干旱趋于加重，缺水将更严重地影响粮食生产。实践证明，水浇地粮食产量要比旱地高出２倍左右，目前我国灌溉面积约４９３５万ｈｍ２，还不到全国粮田面积的５０％，而粮食产量却占到总产量的６０％还多。为此，... According to the prediction of meteorological experts, in the coming decades, China’s climate may become warmer, the drought tends to aggravate, and water shortage will affect grain production more severely. Practice has proved that irrigated land is twice as big as dry land. At present, irrigated land in China is about 49.35 million hm2, less than 50% of the total grain area in the country, while grain output accounts for more than 60% of the total output . to this end,...