关键词: 钾肥, 香稻, 净光合速率, 产量, 品质, 寒地

Abstract: The effects of different potassium fertilizer application level on photosynthetic characteristics, yield and quality of aromatic japonica rice in the cold region were studied in this test, Suigeng 18 and Zhonglonggeng 3 as materials. The results showed that potassium fertilizer could not significantly change SPAD value of the flag leaf, but appropriate amount of potassium fertilizer could improve LAI at full heading stage and net photosynthetic rate of the flag leaf significantly. Appropriate application amount of potassium fertilizer could not only significantly improve seed setting rate, but also could increase the grain number per spike and 1 000-grain weight, thus significantly increase the yield. Potassium fertilizer could not only increase the protein content and the head rice rate, but also could reduce the chalky grain rate and chalkiness degree. Potassium fertilizer could significantly increase aroma and taste quality of aromatic japonica rice. The optimal amount of potassium fertilizer was 96.0 kg/hm2 in this experiment.

Key words: potassium fertilizer, aromatic japonica rice, net photosynthetic rate, yield, quality, the cold region