| Owing to the rapid development of animal husbandry and the severe grassland degradation by overexploritation in recent years in China, the problem between the livestock and the grass supply becomes more and more obvious. As the national agricultural structural adjustment is promoted, animal husbandry gradually develops from the pastoral areas to the agricultural areas, and the forage plantation expands from the traditional natural grassland to the South Mountain and hilly areas. Hongya County in Sichuan province is a national ecological demonstration County, and its climate is very suitable for the growth of high-quality forage. In recent years, some large dairy companies such as "New Hope", "Mengniu" have set up factories there, which makes Hongya County a cow feeding and dairy production base in the southwest area. In recent years forage maize becomes one of main forage crops, and its acreage expands, but with lack of high-yield planting technologies.In this study, annual forage No.2 was selected for the experiment, and grown in the tuanjie cow breeding base in Hongya and Fengjiang scientific farm in Sichuan Agricultural University. Through different application of nitrogen, phosphorus, potassium fertilizers and manure, the influence on the growth, yields, quality and the principle of the nutrient absorption and accumulation of the forage maize was studied under different fertilizer applications, in order to find out the effect of the fertilizer application on growth of forage maize, to guide high-yield production of the forage, and alleviate the contradiction between the livestock and the grass supply, and provide the theoretical basis and technical support for the promotion of the local economic development. The results were as follows:1,Nitrogen application could significantly promote the tillering and the yield potential of the forage maize. In a certain range, the yields of the forage maize increased with the increase of nitrogen fertilizer; when the nitrogen rate reached 180kg/hm2, if the rates continued to increase, the yields would no longer increase but decrease. Also, nitrogen application could significantly improve the crude protein (CP) contents, while reduce the contents of acid detergent fiber (ADF) and neutral detergent fibre (NDF), which lowered the digestibility and so improved the nutrient value of the forage maize. 2,The application of phosphorus fertilizer showed different actions in the two areas. In Ya'an spot (soil available phosphorus 102.5 mg/kg) the application of phosphorus fertilizer had no significant effect on the forage maize, while in Hongya spot (soil available phosphorus 13.5mg/kg), that had significant impact. In the treatments without phosphorus(N180,N180K), in the early times of the forage maize, it had slow growth and the tillering numbers, plant height, dry matter (DM) accumulation and the nutrient absorption were significantly lower than those with phosphorus application(N180P,N180PK,N180PKM). This suggests that the application of the phosphorus fertilizer must be in compliance with the soil, and the seedling stage is the key period for the phosphorus nutrition for forage maize.3,Application of the manure mixed with chemical fertilizers (N180PKM) had significant advantages. Among the growth stages, plant height, tillering numbers, yields and nutrient accumulation were significantly higher than these of other fertilizer applications with the same rate of nitrogen; Manure significantly increased forage CP contents, meanwhile it also significantly increased the contents of ADF and NDF.4,In the whole growth stages, the order of nitrogen, phosphorus and potassium absorption was N>K2O>P2O5 with their ratio:8:1:5.5.5,Whether in Ya'an (2008) or in Hongya (2009), the forage maize in the second planting season (from July to October) had no tillering and low plants, and the DM were only about quarter of the first season. This indicats that the material used in the study (Sicao 2) is not suitable to plant in the the second season from July to October Both in Ya'an and in Hongya.
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