氮磷钾配比施肥对敖汉苜蓿产量和品质的影响

摘要：采用完全随机区组设计，研究了32个氮磷钾施肥配比处理组合对赤峰地区敖汉苜蓿（Medicage sativa cv.Aohan）产量和品质的影响。结果表明，施氮肥可以显著提高苜蓿第1年的产量（P<0.05），苜蓿产量从2.90 t·ha-1提高至3.16 t·ha-1，但施用氮肥对于紫花苜蓿第2年产量的提高幅度较小。磷肥和钾肥处理下敖汉苜蓿的产量差异显著（P<0.05），而钾肥施入量对苜蓿产量的效果则没有氮肥与磷肥明显。施氮肥可以使苜蓿粗蛋白质含量从17.75%提高至18.74%。施磷肥和钾肥也可以提高苜蓿粗蛋白含量，磷肥处理下产量差异显著（P<0.05），但钾肥处理下差异并不显著（P>0.05）。

Effects of nitrogen, phosphorus and potassium ratio fertilizer on the the yield and quality of Aohan alfafa

Randomized block design and 32 different fertilizer treatments combination were used to analyze the effect of different N， P and K combined fertilizer applied on the yield and quality of Aohan alfalfa (Medicago sativa cv. Aohan) in Chifeng region. The results showed that N fertilizer significantly increased the yield of the first year alfalfa（P<0.05）, from 2.90 t·ha-1 to 3.16 t·ha-1 , but the rate of the increase decreased in the second year. P and K fertilizer also significantly improved the yield of alfalfa（P<0.05）, but the effect of K fertilizer was poor than the effect of N and P fertilizer. The crude protein content of alfalfa increased from 17.74% to 18.72% after applied N fertilizer. When applied P and K fertilizer, the crude protein content of alfalfa also increased and the difference were not significant（P>0.05）.