不同施氮水平下苎麻生长特性的研究

Research on Growth Characteristics of Ramie(Boehmeria nivea L.)at Different Nitrogen Levels

以湖南农业大学苎麻研究所选育的"多倍体一号"为材料,采用膨胀珍珠岩盆栽试验与大田试验相结合的方法,系统研究了不同氮素水平对苎麻地上部和地下部生长的影响及作用机理。主要的研究结果如下:氮浓度在10～20mmol/L范围时,随着浓度的增高苎麻地下部和地上部的质量随之增加。施氮能极显著提高苎麻原麻产量,且在各个氮水平之间差异极显著。施氮能极显著提高苎麻根冠比,氮浓度为15mmol/L时根冠比达到最大值。施氮能极显著提高苎麻根系活力,氮浓度为15mmol/L时达到最大值。随着氮浓度的增高,POD活性先增高后降低,氮浓度为15mmol/L时达到最大值,且各处理中破杆麻POD活性比二麻高。

In this research, the ramie variety-Tri-1, which was brooded by the Institute of Ramie Research of Hunan Agricultural University, was selected to serve as experiment material. The effect on aboveground and underground growth of ramie was studied at different Nitrogen levels in pot culture experiment and field experiment. The main research results were as follows. The weight of aboveground and underground were increased with the nitrogen concentration increase when the nitrogen concentration were in 10 mmol/L to 20 mmol/L scope; The rawfiber yield of ramie could be significantly improved by fertilizering nitrogen, and there were significant difference in different nitrogen level; The root shoot ratio of ramie could be significantly improved by fertilizering nitrogen, and the root shoot ratio was maximum, when the nitrogen concentration was 15 mmol/L; Fertilizering nitrogen could significantly improve ramie root activity, and reached at maximum when the concentration of nitrogen was 15 mmol/L; POD activity was first increased and then decreased with the concentration increase, and it reached at maximum when the concentration of nitrogen was 15 mmol/L. POD activities of first crops of different treatment are higher than that of second crops in ramie.