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多年多点试验研究表明 ,河西地区主要耕地 0～ 2 0 cm耕层有效磷平均含量 9.9mg/ kg,10 mg/ kg以下的农田占 5 6 .4% ,大于 15 mg/ kg的 19.5 % ,90 %的农田施磷增产 15 .0 %～ 2 6 .0 %。作物对土壤磷依存率在氮肥激发条件下为 6 8.1%～ 85 .9% ;无肥条件下 46 .1%～ 75 .8% ,供磷能力与土壤磷呈正相关。作物吸收的磷素 14.1%～ 31.9%由当季施肥供给 ,化肥磷素的当季利用率为 9.9%～ 17.6 %。
The multi-year pilot study showed that the available phosphorus content of 0-2.0 cm plowed land in Hexi area was 9.9 mg / kg, that of farmland of 10 mg / kg or below was 56.4%, 19.5% of 15 mg / kg or above, 90% of farmland phosphorus production increased 15.0% ~ 26.0%. The crop phosphorus dependency on soil was 61.1% -85.9% under nitrogen fertilizer stimulation, 46.1% -75.8% under no fertilizer condition, and phosphorus availability was positively correlated with soil phosphorus. 14.1% ~ 31.9% of the phosphorus absorbed by crops was supplied by the season fertilizers, and seasonal utilization of chemical fertilizers was 9.9% ~ 17.6%.