钾素营养对烟株氮代谢及烟叶品质形成的影响

摘 要：本试验通过不同钾肥施用量(K2O)（0kg/hm2，90kg/hm2，180kg/hm2，270kg/hm2，360kg/hm2）田间试验,研究了钾营养对烤烟氮代谢及烟叶品质形成的影响。结果表明，在0～270 kg/hm2范围内，烟叶硝酸还原酶活性和全氮含量、蛋白质含量在烤烟生长前期随着施钾量的增加而增加，而在生长后期随着施钾量的增加而减少；烟叶烟碱含量随着施钾量的增加而减少。钾营养促进了烟株碳氮代谢的协调，有利于优质烟叶的形成。在本试验条件下,烤烟的适宜施钾量为270kg K2O/hm2。

Study on the Effects of Potassium Nutrition in Nitrogen Metabolism and Quality of Flue-cured Tobacco

This experiment studied the effects of potassium in nitrogen metabolism and quality of flue-cure tobacco by different potassium （K2O） levels treatment （0, 90, 180, 270, 360 kg/hm2）. The results showed that the activities of nitrate reductase, the nitrogen content and the protein content of leaves increased with the increasing potassium nutrition levels in a range of 0-270 kg/hm2 during the earlier stage of tobacco growth, and decreased with the increasing of potassium nutrition levels during the later stage of tobacco growth; The nicotine content of leaves decreased with the increasing of potassium levels. In a word, potassium nutrition promoted the coordinate development of nitrogen metabolism, which made the carbon and nitrogen metabolism bloom. Under this experimental condition, the appropriate quantity of adding potassium was 270 kg K2O/hm2.