Studies On Cult-Ecological Adaptability And Energy Utilization Of Forage Crops In Forage-rice Rotation System

These studies introduced annual forage into farmland ecosystem and observed their ecological adaptability and productivity .Main results are summarized as follows:1 .Ryegress cannot adapt to the situation of seeded into early rice Population. In early rice with ryegrass pattern, most ryegrass withered after reaping of early rice in Hunan province. Pacesetter can adapt to the situation of seeded into early rice population and produce green feed about 88 444.5kg/hm2. The utilization ratio of light energy of the pattern of early rice with Pacesetter is 0.74%, the net income perhm2 8 143.5 yuan.2.The mid-season rice with ryegrass is a best pattern in Hunan province. This pattern produces high quality rough rice 9 018kg/hm2 and green feed about 74137kg/hm2. The utilization ratio of light energy of the pattern of mid-season rice with ryegrass is 0.69%,the yield of crude protein 2 442.5 kg/hm2, the net income per hm2 16314 yuan.3.Double Cropping rice with ryegrass pattern (seeding ryegrass seed into late rice population at late stage of late rice) is a high-input and high-output system. The utilization ratio of light energy of the pattern of Double Cropping rice with ryegrass is 0.90%,the yield of crude protein 1 827kg/hm2, the net income per hm2 18 583.5 yuan.4.1n early spring, mowing ahead of schedule could increase ryegrass's yield. The green feed increase by more than 17.8%.5.Ryegrass and Chinese milk vetch intercrop can increase the growth speed of ryegrass regeneration shoots. The growth speed of ryegrass regeneration shoots in intercropping with Chinese milk vetch faster than in single cropping by more than 50%. The yield of ryegrass and Chinese milk vetch intercrop are more than single cropping respectively.