The Effect Of Different Quantity Of N Fertilizer And Mowing Heights On The Output And Quality Of Bachiaria Hybrid

Bachiaria Hybrid is a kind of new excellent ecological forage in recent years. It is preliminarily studied on the aspects of botany character and the nutritional value in the world. Bachiaria Hybrid has the character of fast-growing, high yield and high nitrogen consumption; different forages are not the same as the high or low growth point, the renewable character and the most appropriate stubble height. The higher the stubble height is, the lower the forage harvest yield is; it will undermine the grass growing point and affect the forage grass regeneration if the stubble height is too low. Therefore, the nitrogen nutrition and the stubble altitude play important roles on its output and quality. Researching the impact of nutrients, grass production on different levels of nitrogen and the stubble height of the main growth period, the most appropriate nitrogen fertilization and stubble height of the main growth period will be found on the condition of local soil nutrient. The conclusions were as follows in these two primary factors after one-year experiment:1. Fertilization experiment: Single-factor and randomized design are carried in 5 treatments and 3 times repetition. Among the 5 levels of N fertilization, the highest fresh forage yield was 215.50 t/ha when N 30k g/ha were applied once and the next was 187.01 t/ha when 0 kg / ha, the highest dry forage yield was 37.05 t/ha and 28.83 t/ha respectively. The nutrient contents were the highest when 30 kg / ha purity nitrogen once.2. Mowing experiment: The stubble heights are 0cm, 5cm, 10cm, 15cm and 20cm in jointing stage, flowering and maturity period. The total yields of fresh forage were the highest in the jointing stage of 15 cm stubble height which were 232.00 t / ha in one year. The next was 217.64 t / ha in 20 cm stubble height. The minimum yield was 117.51 t/ ha in the maturity period of 20 cm stubble height. Because the variety of output and assimilation nutriment is two contrary processes in the whole growing process, its economic worthiness was low when the majority of nutrients indexes were the best in the jointing stage of 0 cm stubble height.The conclusions were shown by synthesis comparison: 30 kg / ha once and the Stubble heights of 15cm in the jointing stage were the best.