Effects of Partial Replacement of Chemical Fertilizer by Bio-organic Fertilizer Kunyijian on Yield and Quality of Tobacco Leaves

To explore the application effect of bio-organic fertilizer Kunyijian in flue-cured tobacco and provide scientific basis for its application in production, a plot trial was conducted with K326, a flue-cured tobacco variety, in the Science and Technology Test Base of Xundian County, Yunnan. Taking local fertilizer consumption (control 1) and 70% local fertilizer consumption (control 2) as controls, the following replacement groups were designed: under uniformly replacement 70% local fertilizer consumption, (1) organic fertilizer: microbial agent = 80 : 1（kg）, + 600 kg/ha, + 900 kg/ha, + 1 200 kg/ha, + 1 500 kg/ha Kunyijian; (2) organic fertilizer: microbial agent = 40 : 1（kg）, + 900 kg/ha Kunyijian. The results show that in the treatment of 70% local fertilizer consumption + 1 200 kg/ha Kunyijian [organic fertilizer: microbial agent = 80 : 1（kg）], the comprehensive performance of flue-cured tobacco was significantly better than that in the control groups, the yield of tobacco leaves reached 2 237.1 kg/ha, the output value was 45 505.2 yuan/ha, and the average price of the tobacco leaves was 20.53 yuan/kg. The performance of flue-cured tobacco in the treatment of 70% local fertilizer consumption + 1 500 kg/ha Kunyijian ranked second. The performance of other fertilization treatments was not good, but it did not differ significantly from that of control 1. In terms of chemical composition of tobacco leaves, partial replacement of chemical fertilizer by bio-organic fertilizer Kunyijian, was beneficial to increase the sugar content and reduce the nicotine and total nitrogen contents in tobacco leaves, especially the treatment of 70% local fertilizer consumption + 900 kg/ha Kunyijian (organic fertilizer : microbial agent = 80 kg: 1 kg), and it was also beneficial to increase the chlorine content in tobacco leaves, especially the treatment of 70% local fertilizer consumption + 1 500 kg/ha Kunyijian [organic fertilizer: microbial agent = 80 : 1（kg）]. Therefore, it is feasible to use the bio-organic fertilizer Kunyijian to replace 30% of chemical fertilizer in tobacco production. The rate is recommended to be 900- 1 500 kg/ha [organic fertilizer: microbial agent = 80 : 1（kg）]. It is suggested to further strengthen the demonstration and promotion of Kunyijian.