The effect of cutting frequency on ground vegetation of the tropical tussock grassland

The different cutting frequencies were conducted in the tropical tussock grassland of Kast Areas in one year, and yield, agronomic characters, regenerative capacity and the following year returning green stage were analyzed primarily. The results showed that: 1) the following year returning green stage for 2-4 cutting times postponed 4-10 d compared once in a year; 2) the regeneration height of plants decreased with increasing of cutting frequency in the same growth period. The correlation analysis of treatments among average layer height of grass, grass cover and yield showed a positive correlation (r=0.974 9, r=0.962 8 and r=0.967 5); 3) the fresh and hay yields were 11.87 t/hm2 and 5.33 t/hm2, respectively. There was significant difference of hay yield between treatments (P0.05); 4) the growth rate increased with increasing of temperature, active accumulated temperature and rainfall among different cutting stages for the same treatment, vice versa; the growth rate decreased with increasing cutting frequency in the same cutting time of different treatments. The growth rate was the highest 2.1 g/(m2d) for one cutting in full year.