刈割处理对纳罗克非洲狗尾草产草量和品质的影响

为了确定纳罗克非洲狗尾草（Setaria sphacelata (Schum) Stapf ex Massey）最佳的刈割方式，设计了3个刈割处理，即在植株高度为30 cm、45 cm和孕穗期进行刈割，分析了不同刈割高度对纳罗克纳罗克非洲狗尾草产草量和品质的影响。结果表明：刈割高度对纳罗克非洲狗尾草鲜草产量、干物质产量和品质有较大影响。孕穗期刈割产草量最高，鲜草产量和干物质产量分别为12.29 kg/m2和1.68 kg/m2，比株高在30 cm刈割处理平均增产23.27%和44.83%。株高在45 cm刈割处理的平均鲜草产量和干物质产量为9.97 kg/m2和1.32 kg/m2，比30 cm刈割处理的平均增产11.77%和12.12%。纳罗克非洲狗尾草各刈割处理的粗蛋白含量在13.73%~17.46%之间，株高为30 cm时刈割纳罗克非洲狗尾草粗蛋白含量最高（17.46%），但在孕穗期刈割可获得最高单位面积粗蛋白产量（0.2302 kg/m2）。

Effect of Mowing Treatments on the Yield and Quality of Setaria sphacelata (Schum) Stapf ex Massey

In order to determine the best mowing way of Setaria sphace]ata （Schum） Stapf ex Massey, three mowing treatments with plant height in 30 cm, 45 cm and booting stage of were designed, and the effects of different mowing treatments on the yield and quality of Setaria sphacelata （Schum） Stapf ex Massey were analyzed. The results showed that： there were significant relationships between mowing height and the fresh yield, dry matter yield and quality of Setaria spbaeelata （Schum） Stapf ex Massey. The yield of mowing way in booting stage was the highest, the fresh yield and dry matter yield was 12.29 kg/m2 and 1.68 kg/m2 respectively. They increased by 23.27% and 44.83%, compared with that of 30 cm mowing plant height in average. In mowing plant height in 45 cm, the fresh yield and dry matter yield was 9.97 kg/m2 and 1.32 kg/m2 respectively, which was 11.77% and 12.12% higher than that of 30 cm mowing plant height in average. The crude protein content of Setaria sphaeelata （Schum） Stapf ex Massey in three mowing way was between 13.73% and 17.46%. In mowing plant height in 30 cm, the crude protein content of Setaria spbacelata （Schum） Stapf ex Massey was highest （17.46%）, but mowing in booting stage could obtain the highest crude protein yield of Setaria sphaeelata （Schum） Stapf ex Massey （0.2302 kg/m2）.