Study On Fertilization Technology For Improving Potassium Content And Yield And Quality Of Guangyuan Tobacco

The pH value of 70%tobacco-growing soils in Guangyuan tobacco-growing area exceeded 7.5,the soil was alkaline,the content of available nitrogen and available potassium was low,the content of available calcium in soil was high,and there was a competitive relationship with potassium,which limited the absorption of potassium in Flue-cured tobacco,and made the low potassium content of Guangyuan tobacco affect its intrinsic quality.In this study,the best fertilization technology to improve potassium content and yield and quality of Guangyuan tobacco leaves was determined through the study of potassium base application and topdressing amount distribution,different forms of potassium fertilizer,organic-inorganic compound potassium fertilizer reduction topdressing,different nitrogen application amount and different fertilization formula.The conclusions are as follows:(1)The effects of different basal-topdressing ratios of Potassium Fertilizer on potassium content and yield and quality of tobacco leaves showed that the potassium content of middle and upper leaves of L2(4:6)treatment was 4.48%and 7.19%higher than that of control,respectively,and that of middle leaves of L1(5:5)treatment was2.99%higher than that of control.The sensory quality of L1 and L2 treatment was better than that of control.Overall,the potassium content and intrinsic quality of tobacco leaves were improved at 4:6 basal-topdressing ratio.(2)The effect of different forms of Potassium Fertilizer on potassium content and yield and quality of tobacco leaves showed that the treatment of organic-inorganic compound potassium fertilizer had better yield and output value than that of inorganic potassium fertilizer;the potassium content of upper and middle leaves of organic potassium fertilizer increased by 6.78%and 4.35%,respectively;and the smoking evaluation results of tobacco leaves were better than that of topdressing inorganic potassium fertilizer.(3)The effect of reducing and topdressing application of organic-inorganic compound potassium fertilizer on potassium content and yield and quality of tobacco leaves showed that under the condition of applying organic-inorganic compound potassium fertilizer with a base topdressing ratio of 4:6,the yield of T1(reducing topdressing potassium by 5%)increased by 9.23kg/666.7m2 and the income increased by 194.98 yuan/666.7m2compared with the control group,and the potassium content of tobacco leaves increased by4.76%in T1 treatment,respectively.The sensory quality of tobacco leaves was better than that of other treatments,which showed good aroma,purity,abundant aroma and good taste.(4)The effect of topdressing application of different nitrogen fertilizers on potassium content and yield and quality of tobacco leaves showed that under the condition of applying organic-inorganic compound potassium fertilizer and 4:6 ratio of base Topdressing of potassium application,the yield of K2(1.7kg/666.7m~2)was3.34kg/666.7m~2 higher than that of K0(conventional 1.3kg/666.7m~2),and the yield increased by 64.54 yuan/666.7m~2.The total potassium content of tobacco leaves treated with K2 was the most obvious increase,with the upper and middle parts increased by3.81%and 6.7m2,respectively.67%.The sensory quality of K1(2kg/666.7m~2)and K2treatments were better than that of the conventional control group.The sensory quality of K2 treatments was the best,which showed that the quality was improved and the sweetness was better.(5)The effects of different fertilization formulas on potassium content and yield and quality of tobacco leaves showed that B2(organic-inorganic compound fertilizer+bio-organic fertilizer model)and B1(organic-inorganic compound fertilizer+commercial organic fertilizer model)increased yield by 12?/666.7m~2,10?/666.7m~2,244yuan/666.7m~2 and 210 yuan/666.7m~2 respectively compared with B0(conventional model,tobacco special compound fertilizer+commercial organic fertilizer+chemical fertilizer).Compared with B0,the potassium content in upper and middle leaves of B2 and B1 increased by 9.31%,10.73%and 7.35%,6.21%respectively,and the economic benefits of B2 and B1 increased by 161 yuan/666.7m~2 and 145 yuan/666.7m~2,respectively.The sensory quality of B2 and B1 was better than that of control group.On the whole,B2fertilizer formula is the best.