前言滴灌在美国,尤其是在美国缺水或供水昂贵的地区,或既缺水又供水昂贵的地区越来越显得重要。根据目前的估计,在美国西部大约有十万英亩的土地是采用滴灌的,将来有可能扩大到几百万英亩。滴灌适用于从果园到温室的宽广范围,将来也有可能用于条播作物。滴灌的发展趋向及其存在问题已由科尔(Cole)和布莱克(Black)等人提 Introduction Drip irrigation is becoming more and more important in the United States, especially in the United States where water is scarce or expensive, or where water and water are expensive. According to current estimates, about 100,000 acres of land in the western United States is drip irrigation and may expand to millions of acres in the future. Drip irrigation is suitable for a wide range of applications from orchards to greenhouses and in future may also be used for crop plants. The trend of drip irrigation and its existing problems have been suggested by Cole and Black et al.