Effect Of Potassium Fertilizers Applied By Drip-fertigation On Growth And Quality Of Tobacco

The potassium content of tobacco is an important index that influences the quality of tobacco leaves.Potassium content of tobacco leaf cultivated in C hina is about 2%,while overseas high-quality tobacco leaf potassium content as high as 4% ~ 6%.Potassium chloride is easily water soluble and with high potassium analysis,but due to the chlorine in the fertilizer sensitive to quality of tobacco,it may be limited to use.Tobacco has been cultivated in pot to study the drip fertigation under different K levels,different ratio of potassium chloride and drip fertigation with fulvic acid and zinc on yield and quality of tobacco.The main research results are as follows:1.In a pot experiment,comparing to conventional fertilization,under the condit ion of the same nutrient inputs,drip fertigation treatment can significantly increase the yield of tobacco leaves increased by 21.11%.2.Drip fertigation can greatly increase the potassium content of tobacco leaves,which can reach 8.38%.At the same time,in the case of the same nutrient input,the normal fertilizer application of the lower leaf potassium content was increased by 47.81%,and the potassium content was 4.39%.The level of potassium in the middle leaf increased by 29.15%,reached 4.41%.The amount of potassium in the upper leaf increased by 96.43% and reached 6.60%.3.When the amount of potassium by drip-fertigation is less than conventional fertilization,the leaf K content is still significantly higher than in conventional fertilization.When drip fertigation amount of K is 3.6 g/pot,conventional K is 5.4 g/pot,drip fertigation comprehensively increased the content of potassium in lower leaf than conventional fertilization by 28.96%;The level of potassium in the middle leaf increased by 26.53%.In addition,the potassium content of upper leaves was increased by 82.44%,reaching 6.13%.4.Appropriate use of potassium chloride can increase the output of tobacco leaf,when applying potassium chloride by 25% in the total K use,it can inc rease leaf yield by 4.98%,but there is no difference on the content of potassium with different K sources.5.In the condition of drip fertigation,adding fulvic acid and zinc nutrient in the fertilizers can significantly increase the leaf yield and leaf K content.