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连续 4年的冬小麦定位试验证明 ,旱地施磷 (P2 O5)量在 75～ 30 0 kg/ hm2时 ,小麦的增产率基本随磷肥用量的增加而提高 ,但 P2 O5的增产作用和磷肥利用率却随磷肥用量的增加而降低 ;磷肥不仅当季增产显著 ,而且后效明显 ,第 1季施磷后在第 4季 P2 O5施用量 75 kg/ hm2 的增产率为 5 3.9% ,施用量 15 0 kg/ hm2 的增产率为6 4 .3% ,施用量 30 0 kg/ hm2 的增产率为 10 9.6 % ,1kg P2 O5累计增产小麦依次为 38.7,2 5 .5 ,15 .1kg,分别为第 1次效果的 2 .2 6倍、2 .38倍和 2 .85倍。磷肥的利用率随用量增加而降低 ,当季利用率低 ,累计利用率高 ,施 P2 O575～30 0 kg/ hm2时 ,当季利用率为 12 .0 %～ 4 .3% ,累计利用率达 2 5 .0 %～ 12 .4 %。
The experiment of 4 years of winter wheat locating proved that when the phosphorus content in dry land was between 75 and 30 0 kg / hm2, the increase rate of wheat basically increased with the increase of the amount of phosphate fertilizer, but the increase of P2 O5 and the rate of phosphorus fertilizer utilization But decreased with the increase of the amount of phosphate fertilizer. Not only did the yield of phosphate fertilizer increase significantly during the season but also the obvious aftereffect. The yield of P2 O5 75 kg / hm2 in the fourth season after application of phosphorus was 5 3.9% and 15 0 kg / hm2 increased yield was 6.43%, the application rate of 30 0 kg / hm2 yield was 10 9.6%, 1kg P2 O5 accumulated wheat yield were 38.7,25.5, 15.1kg, respectively The first effect of 2.2 times 6 times, 2.38 times and 2.85 times. The utilization rate of phosphate fertilizer decreased with the increase of the dosage, the utilization rate of the season was low and the cumulative utilization rate was high. When the application rate of P2 O575 ~ 300 kg / hm2 was 12.0% ~ 4.3%, the cumulative utilization rate Up to 25.5% ~ 12.4%.