Abstract:

Abstract: This experiment studied the effects of potassium in nitrogen metabolism and quality of flue-cure tobacco by different potassium(K2O) levels treatment(0kg/ hm2，90kg/ hm2，180kg/ hm2，270kg/ hm2，360kg/ hm2). The main results are showed, 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. 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 is 270kg K2O/hm2.