沙碱地土层较薄,养分含量低,有机质含量不足1.0%。其土体结构松散,耕性良好,漏水漏肥严重,春天有轻微的返碱现象,发“小苗”不发“老苗”。历年来,小麦亩产徘徊在200公斤左右,并且投入(施肥、浇水)越多,产量不仅没有增加,反而还要下降,经济效益很低。1989～1992年,我所在临汾市实施了万亩沙碱地小麦高产攻关开发研究,收到明显的效果。三年小麦平均亩产353.7公斤,比开发前三 SAC soil thin, low nutrient content, organic matter content of less than 1.0%. Its loose soil structure, good tillage, serious leakage leakage, the spring back to a slight slight phenomenon, the “seedlings” not “old seedlings.” Over the years, the output of wheat hovers around 200 kilograms, and the more inputs (fertilization and watering), the more the output has not increased but the decline has been achieved with low economic returns. From 1989 to 1992, Linfen City, where I implemented mu mu mu of alkali-alkali wheat high yield research and development, received significant results. Three-year average yield of wheat per month 353.7 kilograms, compared with the first three