| The trial was conducted at ya'an city. In the trial, Hemarthria compressa (L. f) R. Br. cv. Guangyiea and Triflium repen L. cv. Chuanyin Ladino were studied the changes of yield and quality. Three management factors which included cutting frequency, the level of N fertilizer application and seeding rates of grass/legume were selected to study effecting to yield and quality . The yields of two grasses and the total yields in mixed pasture under different cutting frequency, seeding rates and nitrogen fertilizer were determined from 2002 to 2003. At the same time , the three factor were selected to set up the regression model in mixture pasture of limpograss and white clover .The relationship between herbage yield and management factors was analyzed by means of these modeling. According to modeling, finally optimal management plan was determined using computer. Study of planting and mixing technologies were analyzed and discussed to get optimal management plan for evolution of the South of China. The result shows:1. The yield of limpograss and white clover on different cutting frequency was significantly different (P<0.01), and the yields on different nitrogen fertilizer and seeding rate were not significantly different (P>0.05). There was a statistically significant relation with seeding rates and nitrogen fertilizer, and the yields on two factors were significantly different2. The yield of limpograss and total yield in the cutting 4 times were the highest They were 29.98 t/hm2and 30.21t/hm2. The yield of limpograss and total yield were the second. They were 21 .29 t/hm2 , 21 .62 t/hm2. However, the yield of white clover in the cutting 6 times was the highest. They were 4.58 t/hm2. So the yield of limpograss would be decreased if cutting time was frequent, but the yield of white clover would be increased.3. When the cutting time was lower, the yield of limpograss was increased in the treatments of higher fertilizer and seeding rates than in other treatment. However, the yield of white clover was decreased. When the cutting time was frequent, the yield of limpograss was decreased in the treatments of higher fertilizer and lower seeding rates, but the yield of white clover was increased.4. The crude protein content of limpograss was decreased in July and August. The content on cutting 4times was the lowest, but the ADF content was higher from 42.83% to 43.02%. At the same time, the crude protein content was higher in April and November. The content on cutting 5 times was the highest from 13.54%-14.30%. The ADF content of limpograss was decreased in April and November. The ADF content of A4B4C1 treatment was only 29.59%. However, the protein content of white clover was little change in one year.5. The protein yield of limpograss on cutting 4 times was the highest. It was 251.54g/hm2. The protein yield of limpograss on cutting 5 times was the second. It was 244.88 g/m2. But protein yield of limpograss on cutting 4times and on cutting 5 times was not significantly different (P>0.05). The ADF yield of limpograss on every cutting time was significantly different (P<0.01). The ADF yield of limpograss on cutting 4 times was the highest. It was 112.98 g/m2. The protein yield of white clover on every cutting time was significantly different (P<0.01). The protein yield and ADF yield of white clover on cutting 6 times were the highest. They were 117.29 g/m2 and 120.02 g/m2.6. When the cutting time was lower, the crude protein yield of limpograss was increased in the treatments of higher fertilizer and seeding rates than in other treatment. However, the yield of white clover was decreased. When the cutting time was frequent, the crude protein yield of limpograss was decreased in the treatments of higher fertilizer and lower seeding rates, but the yield of white clover was increased.7. According to modeling, finally optimal management plan was determined using computer. The best plan in the pasture was to 50% seeding rate of grass, cutting 5 times, and 0.3t/hm2 N fertilizer application. |
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