Abstract:

In order to determine the best mowing way of Setaria sphacelata (Schum) Stapf ex Massey, three mowing treatments with plant height in 30cm, 45cm and booting stage of were designed, and the effects of different mowing height 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 sphacelata (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 sphacelata (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 sphacelata (Schum) Stapf ex Massey was highest (17.46%), but mowing in booting stage could obtain the highest crude protein yield of Setaria sphacelata (Schum) Stapf ex Massey (0.2302 kg/m2).