不同施氮水平对朝鲜碱茅生产性能的影响

研究不同施氮水平对朝鲜碱茅生产性能的影响。结果表明,施用氮肥对提高朝鲜碱茅种子和草产量有显著作用,施氮量138 kg/hm2效果较好。种植第3年的朝鲜碱茅施氮138 kg/hm2种子和草产量分别达到613.33 kg/hm2和7 100.40 kg/hm2,分别比对照增产177.1%和102.1%,平均每千克氮增产种子和草产量分别为2.8 kg和26.0 kg。种植第4年的朝鲜碱茅施氮量138 kg/hm2时,种子和草产量分别为524.40 kg/hm2和6 807.60kg/hm2,分别比对照增产209.7%和232.1%,平均每千克氮增产种子和草产量分别为2.6 kg和34.5 kg。施氮使朝鲜碱茅株高和密度增加,并可提高饲草的粗蛋白质含量。

Effects of Different Nitrogen Application Rates on Productiveness of Puccinellia chinampoensis Ohwi

Effects of different nitrogen application rates on productiveness of Puccinellia chinampoensis Ohwi were studied in the paper.The results showed that applying nitrogen fertilizer has significant effect on the increase of seed and herbage yield.The optimal effect was achieved when 138 kg of nitrogen was applied per hectare.Seed and herbage yield of this treatment in third year after sowing were 613.33 kg/hm2 and 7 100.40 kg/hm2,with an increase of 177.1% and 102.1% compared to the control.Increase of seed and herbage yield per 1 kg nitrogen was 2.8 kg and 26.0 kg.Seed and herbage yield of this treatment in fourth year after sowing were 524.40 kg/hm2 and 6 807.60 kg/hm2,with an increase of 209.7% and 232.1% compared to the control.Increase of seed and herbage yield per 1 kg nitrogen was 2.6 kg and 34.5 kg.The application of nitrogen increased the plant height and density and raised crude protein content of herbage.