氮磷肥配施对羊草干草产量、养分吸收及品质影响

以中科2号羊草(Leymus chinensis ‘Zhongke No.2’)为材料,系统分析了氮磷肥配施对干草产量、品质及养分吸收的影响.结果表明:增施氮肥羊草产草量显著增加(P<0.05),以120 kg·hm^-2 P₂O₅为肥底、施用120 kg·hm^-2 N时产草量最高,较对照增产1.5倍;氮、磷、钾吸收量随氮磷肥施用量的增加均呈现先增加后减少趋势,适当增施磷肥促进氮素的吸收,增施氮肥促进磷素的吸收,钾吸收量对氮肥响应显著;氮磷肥合理配施有效增加羊草粗蛋白含量,降低粗纤维和无氮浸出物含量,以120 kg·hm^-2 P₂O₅为肥底、施用90 kg·hm^-2 N时羊草品质最优,且经济效益较对照增收1.48倍,建议同类地区推广施用.

The Effects of Nitrogen Fertilizer and Phosphate Fertilizer Rates on the Yield,Nutrient uptake and Quality of Leymus Chinensis

The effects of combined application of nitrogen and phosphorus fertilizer on the quality, grass yield and nutrient uptake of Leymus chinensis were analyzed at the west beach of Yanchi county in Ningxia. The results showed that the grass yield of Leymus chines ‘Zhongke No.2’ fertilized 120 kg·hm^-2 N with the base fertilizer of 120 kg·hm^-2P₂O₅ increased 1.5 times compared to control. The grass yield of Leymus chines ‘Zhongke No.2’ significantly increased after fertilizing more nitrogen (P<0.05). The uptake of nitrogen, phosphorus and potassium firstly increased and then decreased with the increases of nitrogen and phosphate. Rational fertilization could effectively increase the crude protein content of Leymus chinensis, and lower the content of nitrogen-free extractum. The quality of Leymus chinensis was the best after fertilizing 90 kg·hm^-2 N with the base fertilizer of 120 kg·hm^-2 P₂O₅ and the economic efficiency increased 1.48 times. Therefore, the combined application of 90 kg·hm^-2 N with the base fertilizer of 120 kg·hm^-2 P₂O₅ was recommended to be applied in the same region.