我国南方川、滇、湘、鄂、浙、黔、桂七省,耕地三亿亩,其中旱地近半。旱粮占旱地面积的三分之二,但旱粮仅占全年粮食的25.5%。显而易见,旱地的内含增产潜力是巨大的。南方各省,大都为亚热带气候。雨量充沛,气候 China’s southern Sichuan, Yunnan, Hunan, Hubei, Zhejiang, Guizhou, Guangxi seven provinces, 300 million mu of cultivated land, of which nearly half of the dry land. Dry grain accounts for two thirds of the dry land area, but dry grain accounts for only 25.5% of the full year’s grain. Obviously, the potential for upside potential in drylands is enormous. Southern provinces, mostly subtropical climate. Rainfall, climate