磷石膏对提高氮肥效率的研究

磷石膏与碳铵和尿素混合或制成尿素磷石膏复混肥施用均可提高氮肥生产率及氮肥利用率，改善小麦、玉米的农艺性状，提高作物的产量。碳铵与磷石膏混施其氮肥利用率提高２．８２％～３．７０％，每公斤Ｎ增产小麦１．２３ｋｇ、玉米１．８５ｋｇ；尿素与磷石膏混施其利用率提高６．３２％～８．８２％，其生产率增加２．１１ｋｇ（小麦）、１．１４ｋｇ（玉米）；尿素与磷石膏制成复混肥其利用率提高１３．３８％，其生产率增加３．０６ｋｇ（玉米）。小麦及玉米的产量因添加磷石膏而分别增加５．２％～９．２％、５．５％～８．６％。

STUDY ON APPLYING PHOSPHOGYPSUM FOR INCREASINGN-FERTILIZER EFFICIENCY

This paper discribed the effect of phosphogypsum(PG) on N-fertilizer productivity and utilization rate by pot and field experiments. The PG was blended fully with urea or ammonium bicarbonate fertilizers before they were used. The main results showed: (1) When the PG was mixed with ammonium bicarbonate, the increase in N-fertilizer utilization rate ranged from 2.82% to 3.70%, the N-fertilizer productivity increased grain by 1.23 kg/kg (wheat), 1.85kg/kg (maize); (2)When the PG was added to urea, the increase in N-fertilizer utilization rate ranged from 6.23% to 8.82%, the productivity increased by 2.11kg/kg (wheat),1.14kg/kg(maize); (3) When the PG and urea were compounded into blending fertilizer, the utilization rate and productivity increased by 13.38%, 3.06kg grains/kg N (maize) respectively; (4) The increase in the yield of wheat ranged from 5.2% to 9.2%, the maize ranged from 5.5% to 8.6% because of adding PG to N-fertilizers; (5) Pot experirment also showed that owing to adding PG the plant recovery of N-fertilizer and N-accumulation increased.