Effect Of Drip-NK-fertigation On Growth,Yield And Quality Of Flue-cured Tobacco

Drip irrigation fertilization technology is a comprehensive management measure for sustainable development of modern agriculture.Its merits include economy water and fertilization,increasing production,improving quality and saving labor.In this paper,under conditions of driping N and K irrigation,through field experiments,research the different levels of N and K fertilizer on growth,productivity,yield and quality,accumulation and distribution of dry matter and nutrients,fertilizer and nutrient uptake efficiency of flue-cured tobacco.The results showed as follow:1.It is no significant effect on the growth of tobacco when reduce the amount of N and K application under conditions of driping N and K irrigation.The same as conventional fertilization,60% of N and K after transplanting in 15 days through drip irrigation dressing,tobacco plant height,girth,effective leaf number and maximum leaf area and other agronomic traits and physiological indices are better than furrow to all fertilizer.Two treatment of 20% to 40% of N and K reducing fertilizer,the tobacco agronomic traits and physiological indicators was no significant difference with conventional fertilization.60% of N and K reducing fertilizer,the growth of tobacco is weaker than conventional water and fertilizer management.2.It is helpful to improve the aboveground dry matter accumulation of flue-cured tobacco under conditions of driping part N and K irrigation.The same as conventional fertilization,60% of N and K after transplanting in 15 days through drip irrigation dressing,significantly increased dry matter accumulation of aboveground.Compared to conventional water and fertilizer management,20% of N and K reducing fertilizer,aboveground dry matter accumulation of tobacco will not reduce but increase.40% of N and K reducing fertilizer,aboveground dry matter accumulation is equal to conventional fertilizer management.Continue to reduce N and K amounts to 60%,dry matter accumulation of tobacco plants will be reduced.3.The tobacco plant nutrient content and accumulation is reduced with culting down the application of N and K fertilizer.The four drip irrigation fertilizer treatment,with culting down the application of N and K fertilizer,the plant nutrient content and nutrient accumulation is reduced.Between different treatments,the nutrient content and accumulation was not significantly different in the early growth time,with the growth period extended the difference was gradually increased.When 20% to 40% ofN and K reducing fertilizer,the nutrient content and accumulation was not significantly different with conventional water and fertilizer management.4.It is benefit to improve the efficiency of nutrient absorption and fertilizer partial productivity that apply part of N and K through drip irrigation.Under the same conditions of fertilization,through drip irrigation topdressing 60% of N and K,the absorption efficiency and partial productivity Nutrients improved significantly.The absorption efficiency and partial productivity of N and K were significantly improved with reducing the application of N and K.5.The yield and quality of flue-cured tobacco was improved reducing the amount of N and K application under conditions of driping part N and K irrigation.Compared to conventional water and fertilizer management,the treatment that 60% of N and K in 15 days after transplanting through drip irrigation dressing improved the yield,but reduced the quality seriously.Under drip irrigation topdressing part of N and K condition,20% to 40%N and K reducing amounts was most conducive for the formation of Tobacco Yield and Quality,continued to reduce N and K fertilizer will reduce the yield and quality.6.It is benefit to improve the economic efficiency and the proportion of superior tobacco that apply part of N and K through drip irrigation.The economic efficiency and the proportion of superior tobacco was highest that 40% the N and K reducing application under conditions of driping part N and K irrigation,20% of N and K reducing application is second.20% and 40% N and K reducing application rates,the proportion of superior tobacco were improved 26.41% and 11.11% than regular water and fertilizer management,the income of per hectare increased by 0.83 and 0.77 ten thousand yuan.In summary,under the condition of drip irrigation fertilizer,it will not affect the normal growth of tobacco plant 20% to 40% of N and K reducing amounts,and it will not reduce tobacco production,and significantly improve the efficiency of nutrient absorption and fertilizer partial factor productivity and improve the quality,increase economic efficiency.Therefore,60% to 80% of conventional nitrogen and potassium fertilizer is appropriate under the experimental conditions,and the economic benefits is highest.