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在田间挖一长、宽、深均不小于1米的土坑,挖出的土按耕作层、心土和底土的土质各自堆放,各掺入5%～10%的粗砂,充分拌和均匀后,再按原层次还入坑内,尽可能夯打密实,耕层疏松仍种作物。由于掺砂降低了土壤的田间持水量,该坑位置上所种的作物必略先于这块大田的作物出现旱象,如中午茎叶临时萎蔫和叶尖发黄等,这时大田就正处于灌溉的适期。本法可以在壤土和砂性土地区推广应用。
Dig a long, wide and deep pit not less than 1 meter deep in the field. The excavated soil shall be plowed. The soil of the heart and subsoil should be piled up separately. The mixed sand shall be mixed with 5% -10% coarse sand evenly Then, according to the original level and also into the pit, compacting as dense as possible, still loose crop cultivation of crops. Due to the decrease of soil water holding capacity due to sand dredging, the crops in the pit position must be slightly earlier than cropland in this field, such as temporary wilting of leaves at midday and yellowing of leaves, etc. At this moment, The appropriate period of irrigation. This Law can be applied in loamy and sandy areas.