为了节约用水,现在很多农田灌溉都已采用在土壤下面进行根部浸灌的方法。但在土壤下面铺设的有孔管道,其孔眼最易被淤泥堵塞而浸不出水。现在,美国西佛杰排灌公司研制并生产出的双层排灌水管彻底解决了这一难题。双层水管的外管较薄,紧箍在内管上,内外两管的管壁上都有孔眼。当 In order to save water, many farmland irrigation methods have been used to infiltrate roots under the soil. However, the laying of perforated pipe under the soil, the hole is most easily blocked by the mud and immerse the water. Now, the United States West Fung irrigation and drainage irrigation company developed and produced double drainage pipe completely solve this problem. Double outer tube thin outer tube, tight hoop in the inner tube, both inside and outside the tube wall has holes. when