在宁夏南部山区清水河流域河谷阶地条件下，试验观察了氮磷钾配施对紫花苜蓿种子产量的影响，结果表明，以分枝期施氮24 kg /hm2、磷90 kg/hm2、不施钾肥处理的种子产量最高，平均折合产量483.58 kg/hm2，较其余处理增产3.57%～20.8%，是氮磷钾配施的最优组合。

The influence of NPK fertilizer on yield of alfalfa seed was observed in the mountainous area of southern Ningxia. The results showed that the seed yield was highest in processing of nitrogen 24 kg/hm2， phosphorus 90 kg/hm2， no potassium fertilizer and fertilizer in branch period seed . The average seed yield was 483.58 kg/hm2 and 3.57% ~ 20.8% higher than of the check. The results also indicated that the processing combination was optimal combination of NPK fertilizer under the conditions of alfalfa test .

S565.4

宁夏回族自治区“十一五”科技攻关项目“草地建植管理技术研究与示范” (NZ0926)部分内容