试验方法一、土垡暗沟的设置:晚稻要搁好田,收割前6—7天要干干湿湿,保持土壤湿润不陷脚,为挖深沟作好准备。挖沟分三步进行:(如图1)第一步先刨去表土层;第二步切土宽8寸、深9寸的土垡,切垡稍带倾斜面,这样复盖时吻合紧密,土垡要按次序排列在沟边;第三步在第二层中心开挖沟宽2寸左右,深11寸左右的小沟。要挖一段清一段,保持沟底平 Test methods First, the soil riparian ditch settings: Late rice should be put good field, 6-7 days before harvest to dry wet, keep the soil moist does not fall, to dig deep trench to prepare. Trench ditch in three steps: (Figure 1) The first step to planing the topsoil; the second step cut 8-inch wide, deep 9-inch soil 切, cut 垡 slightly inclined surface, so close cover close fit , Soil 垡 to be arranged in order to follow the edge of the ditch; the third step in the center of the second floor ditch excavation about 2 inches wide and about 11 inches deep groove. To dig a paragraph clear, keep the ditch flat