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作者于1979—1982年在苏联某国营农场测定了在灌溉情况下苜蓿地施磷肥的最适量。试验地块的土壤是一般的贫瘠黑钙土。耕作层腐植质含量为4.52％,在100克土中含水解氮12.7毫克;有效磷2.2;代谢钾23。在苜蓿分枝和孕蕾期进行灌溉,灌水量为700米~3/公顷。在苜蓿开花期以前,土壤一米深的土层内的含水量保持在土壤最低含水量的70—100％,从开花到籽实成熟时为55—60％。
In 1979-1982, the authors determined the optimum amount of phosphate fertilizer for alfalfa under irrigation conditions at a state farm in the Soviet Union. The soil in the experimental plot is generally poorly calcareted black earth. Tillage humus content of 4.52% in 100 grams of soil containing hydrolyzed nitrogen 12.7 mg; available phosphorus 2.2; metabolic potassium 23. Irrigation in the alfalfa branches and buds during pregnancy, irrigation volume of 700 m ~ 3 / ha. Prior to flowering of alfalfa, the water content in the soil one meter deep in the soil remained at 70-100% of the minimum soil moisture content, from 55-60% at flowering to seed maturity.