Abstract:

Abstract: In this research, the ramie variety—Tri-1，which were breeded by the Institute of Ramie Research of Hunan Agricultural University, was selected to serve as experiment materials. Pot experiment and field experiment were conducted to study the effect and mechanism on above and underground growth of ramie at Different Nitrogen Levels. The main research results were as follows. 1. It can promote the growth of ramie below-ground and significantly improve ramie above- and underground weight as the nitrogen concentration in the10 mmol/L～20 mmol/L 2. Fertilizering nitrogen could significantly improve the weight of raw linen of ramie, and the Different Nitrogen Levels is remarkable; 3. Fertilizering nitrogen could significantly improve the root-top ratio of ramie, and reached at maximum cap when the concentration of nitrogen at 15 mmol/L; 4. Fertilizering nitrogen could significantly improve ramie root activity, and reached at maximum when the concentration of nitrogen at 15 mmol/L; 5. POD activity was first increased and then decreased after the maximum with the concentration increased, and reached at maximum when the concentration of nitrogen at 15 mmol/L. POD activities of first season ramie of different treatment are higher than that of second season ramie.