为研究用生产蛋白维生素浓缩食品厂的未净化污水进行肥田和润田灌溉对土壤和农作物产量的影响,自1975年开始,作者进行了田间试验。试验地块的土壤是灰色森林土壤,其自然肥力并不高。腐殖质的含量为1.7—2.4%,总氮为0.1%。每100克土壤含 p_2O_54—5毫克,含 K_2O7.5—10.3毫克。土壤的 pH 值为6.3～6.5。就土壤的机械成分而言,是中砂 To study the effects of fertigation and soil runoff irrigation on soil and crop yields in raw wastewater from the production of protein vitamin concentrate foodstuffs, the authors conducted field trials starting in 1975. Soil in the experimental plot is gray forest soil, and its natural fertility is not high. The content of humus is 1.7-2.4% and the total nitrogen is 0.1%. Per 100 grams of soil containing p_2O_54-5 mg, containing K_2O7.5-10.3 mg. Soil pH is 6.3 ~ 6.5. In terms of the mechanical composition of the soil, it is medium sand