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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。
The effects of nitrogen, phosphorus and potassium fertilizers on the growth of alfalfa under alkaline soil conditions were studied. The yield and plant height of alfalfa under different fertilization treatments were determined by randomized block design. The results showed that the yield of alfalfa hay was “N ” with the increase of nitrogen application rate, but with the increase of phosphorus and potassium content, the yield of alfalfa rose first and then decreased. Under the condition of nitrogen application, the total yield of alfalfa hay was the highest at the rate of 60 kg / hm2 and 21.7% higher than that under the no-fertilization treatment. Under the condition of phosphorus application, the hay output was 135 kg / hm2 The highest yield was found under the condition of no fertilization. Under the condition of applying potassium, the yield of hay was highest at the rate of 90 kg / hm2 and the yield was 58 823.2 kg / hm2. Nitrogen, phosphorus and potassium fertilizers all promoted the growth of alfalfa plant height, and the first and second crop increased more than the third and fourth crop.