不同刈割高度对南牧1号杂交象草产量与品质的影响分析

Analysis on the influences of different cutting height on the yield and quality of hybrid napiergrass "Nanmu No.1"

南牧1号杂交象草具有很强的再生性和耐刈割性,为了确定最佳的刈割利用方式,在有限的耕地中获得较高的产量和效益,采用小区试验的方法,研究不同刈割高度对南牧1号杂交象草产量和品质的影响,结果表明:刈割高度对南牧1号杂交象草鲜草产量、干物质产量、品质有较大影响,随刈割高度的增加,年产草量呈抛物线式变化,刈割高度增加,粗蛋白含量下降、粗脂肪变化不明显、中性洗涤纤维和酸性洗涤纤维升高。刈割高度2.5 m平均每667 m2鲜草产量和干物质产量分别为22.95 t、3.25 t。

Hybrid napiergrass （Pennisetum purpureum Schumach） ＂Nanmu No. 1＂ possesses the characteristics of strong regenerating capacity and tolerance to multi-time cutting. In order to make sure the best cutting and utilizing mode and achieve higher yield and benefit in the limited field, the influences of different cutting heights on the yield and quality of the hybrid napiergrass ＂Nanmu No. 1＂ were studied by adopting a plot experiment. The results showed that there were obvious influences of cutting height on the fresh yield, dry matter yield and quality of the hybrid napiergrass ＂Nanmu No. 1 ＂. Following with the increase of the cutting heights, there were a parabola model on the annual yield, a decrease in the crude protein contents and an increase on the neutral detergent fiber and acid detergent fiber, but no obvious variation was found in the crude fat contents of the hybrid napiergrass. The fresh yield and dry matter yield per 667m^2 were 22.95 t and 3.25 （344. 25 t/hm^2 and 48.75 t/hm^2 ） trespectively if the cutting height was at 2.5 m.