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在只施氮肥的基础上增施磷肥、钾肥和磷钾肥配合施用明显地提高苏丹草产量,经过5次收获统计分别提高鲜草产量16 6%、20 3%和35 3%,其中磷钾肥配合施用增产效果最好。研究结果显示钾肥施用能明显地增强鱼草后期生长,保证鱼草在整个生长期都能丰产。经济效益分析结果表明,磷钾肥的配合施用增加净利润达3872元/hm2,肥料施用产投比达2 95。
With the application of only nitrogen fertilizer, the application of phosphate fertilizer, potassium fertilizer and phosphorus-potassium fertilizer significantly increased the yield of sudangrass. After five harvests, the yield of fresh grass was increased by 16.6%, 20.3% and 35.3% respectively. Application yield the best. The results show that potassium application can significantly enhance the late growth of larva and ensure the high yield of larval in the whole growth period. The results of economic analysis showed that the combined application of phosphorus and potassium fertilizer increased net profit of 3872 yuan / hm2, fertilizer production and application ratio of 2 95.