不同施肥处理对紫花苜蓿产量和株高的影响

Effects of Different Fertilization on Output and Plant Height of Alfalfa

研究了在碱性土壤条件下氮、磷、钾肥对紫花苜蓿生长状况的影响,通过随机区组设计测定了不同施肥处理下紫花苜蓿的产量及株高。结果表明,紫花苜蓿干草产量随着施氮量的增加呈"N"字型变化趋势,但随着施磷、钾量的增加呈现先上升后下降的趋势。在施氮情形下,紫花苜蓿干草总产量在施氮量为60kg/hm2时最高,比不施肥处理情形下的产量高21.7%;在施磷情形下,干草产量在施磷量为135kg/hm2时最高,与不施肥处理情形下的产量差异极显著;在施钾情形下,干草产量在施钾量为90kg/hm2时最高,产量为58 823.2kg/hm2。施氮、磷、钾肥均能促进紫花苜蓿株高的增长,并且第一、二茬株高增加幅度要大于第三、四茬。

Effects of nitrogen, phosphorus, potassium fertilizer on the growth of alfalfa in the alkali lands were studied. The output and plant height of alfalfa with different fertilization were measured by means of randomized block design. The results showed that the output of alfalfa hay changes like N with increasing the amount of nitrogen fertilizer, while the output increased initially and then decreased with the increase in the amount of phosphorus and potassium fertilizers. With using nitrogen fertilizer, the output of alfalfa hay was highest as the nitrogen amount was 60kg/hm^2,which is 21.7% higher than that without fertilizer. With using phosphorus fertilizer, the output was the highest as the phosphorus amount was 135kg/hm^2 , which was different obviously from that without fertilizer. With using potassium fertilizer, the output of alfalfa is highest as the potassium amount was 90kg/hm^2, which was 58823.2kg/hm^2. All the nitrogen, phosphorus and potassium fertilizer facilitate increasing plant height of al- falfa. The increasing amounts of plant height of the first crop and second crop are higher than those of plant height of the third crop and fourth crop.