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供应可给态磷较少的浅栗色土壤施磷肥时,由于糖甜菜轮作中苜蓿耕层内3年磷的储积,大大改善了土壤的磷酸盐状况。从产量、根中含糖率和一公顷产糖量看,同样数量的磷肥定期施用较年年施用表现出最好的效果。
Phosphorus supply to shallow chestnut soils which supply less phosphorus can greatly improve the phosphate status of the soil due to the 3-year accumulation of phosphorus in alfalfa plow layers in sugar beet rotation. Judging from the yield, the sugar content in the roots and the sugar yield in one hectare, the same amount of phosphate fertilizer showed the best effect on a regular basis compared with that on the annual basis.