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一、清沟排渍。棉花怕水渍,特别在苗期雨水较多时,应搞好清沟排渍。按水系和棉田片块,搞好开沟、清沟、达到“四沟”(主沟、腰沟、垅沟、围沟)畅通。一般要求厢沟深20～25厘米,腰沟30～40厘米,围沟50厘米以上,大沟一米左右,做到明水能排,暗水能滤,雨停沟干。这样有利于减轻棉田渍害,降低田间湿度,改善耕层透气状况;有利于灌溉,有利于夺取夏粮增产丰收和棉花—播全苗;有利于棉田及时管
First, clear ditch row of stains. Cotton afraid of water stains, especially in the seedling rain when more should be done to clear the ditch row of stains. Press water and cotton fields, do a good job of ditching, ditch, reaching “four ditch ” (the main ditch, waist ditch, ditch ditch, ditch) smooth. Generally require the box ditch deep 20 ~ 25 cm, waist ditch 30 ~ 40 cm, ditch more than 50 cm, about a kilometer ditch, so that water can be discharged, dark water can filter, rain stopped ditch. This will help reduce cotton soil damage, reduce field humidity and improve the ventilation of the topsoil; is conducive to irrigation, is conducive to seizing summer grain yield and cotton - sowing seedlings; is conducive to timely control of cotton fields