Effects Of Nitrogenapplication Combined With Potassium On Growth, Yield, Quality And Economic Benefits Of Flue-eured Tobacco In The East Gansu

According to the low plant benefits caused by high nicotine content and low potassium(K) content offlue-cured tobacco, the effects of flue-cured tobacco growth, dry matter accumulation and distribution, nutritionelements accumulated, quality and economic benefits on different nitrogen application combined withpotassium(NACP)were studied under the field experiment conditions of equal nitrogen and phosphorus rates inzhengning county Qingyang city in the east of gansu province. in2009The results showed that:NACP was optimized with tobacco agronomic characters parameters, single N or K₂O, tobacco plant height,stem diameter, maximum leaf area and leaf number and other biological were relatively low, explained theappropriate NACP gave more conducive to flue-cured tobacco growth than with single N or K₂O, and in thisfield trial, N2K3treatment was most favorable to flue-cured tobacco growth.NACP caused a notable effect with flue-cured tobacco dry matter accumulation and distribution.With theincreasing amount of K₂O, leaves, stems and roots dry matter accumulation of flue-cured tobacco had a trend ofincrease, with the increase of N, leaves, stems and roots dry matter accumulation of flue-cured tobacco was firstincreases, then decreases trend; On the whole, in N0K2and N2K0roots, stems, dry weight below othertreatments, and in N2K2and N2K3higher, showed that the appropriate NACPhad more conducive to flue-curedtobacco plant dry matter accumulation than with single N, K₂O. Therate of N and K₂O in1:4.5was helpful fortobacco leaves dry matter accumulation; In N0K2and N2K0,dry matter distribution in the leaves is higher, inmature in roots distribution was lower, the appropriate NACP reduced leaves dry matter distribution offlue-cured tobacco, improved the roots dry matter distribution of flue-cured tobacco in the mature period.NACP caused a notable effect with flue-cured tobacco nitrogen, potassium content.Leaves nitrogen content were in first increased and then drop au change trend with development period, nitrogencontent of stems and roots changed without obvious rule in growth period. NACP increased nitrogen content influe-cured tobacco leaves., super abundant N was not helpful for improving flue-cured tobacco leavesphosphorus content. With the increase of N, flue-cured tobacco leaves potassium content was first increased andthen decreased trends, With the increase of K₂O applied flue-cured tobacco leaves, stems, and roots opotassiumcontent increased, overall with K₂O increased the increase trend was a consistent.NACP caused a notable effect with flue-cured tobacco nitrogen, phosphorus and potassium accumulation.Nitrogen accumulation of flue-cured tobacco plant had increasing trend in all treatment, N and K₂O increasednitrogen accumulation of flue-cured tobacco leaves, stems, and roots mid and later period. Different proportionof NACP was beneficial to flue-cured tobacco plants with nitrogen accumulation rise, with the highest N2K3tomaturity, different proportions of NACP improved nitrogen accumulation of the organs of flue-cured tobacco inmid and later period.Different treatment flue-cured tobacco leaves phosphorus accumulation were tending toincrease-minus-increase.Single N and K₂O, was not helpful to tobacco phosphorus accumulation, but withNACP nitrogen is unfavorable and exorbitant.Different treatment was different in flue-cured tobacco leaves potassium accumulation of trend,differenttreatment flue-cured tobacco stems potassium accumulated were in first increased and then decreased au changetrend, Different NACP was beneficial to flue-cured tobacco plants with the improvement of potassiumaccumulation, and N2K3to deal with the most excellent.NACP had a notable effect for the quality of flue-cured tobacco.Different N and K₂O dosage and ratio causedsignificant influence for nicotine content of flue-cured tobacco tobacco. When different leaves had a nicotineoptimal the proportion of N and K₂O was different; Increased N fertilizer, with N: K₂O increased, the nicotinecontent of flue-cured tobacco were significantly increased; Add potassium fertilizer, with N: K₂O reduced, thenicotine content of flue-cured tobacco upper and middle leaves were first increased and then decreased to increase, the lower leaves were first decreased and then increased; K₂O dosage different N and K₂O ratio causedsignificant influence for potassium content of flue-cured tobacco tobacco,and increased K₂O fertilizer, with N:K₂O reduced,potassium content of flue-cured tobacco leaves increased significantly; Increased N fertilizer, withN: K₂O increased, potassium content offlue-cured tobacco leaves had certain increase,but not significant. Andthe N2K3had thehighestt leaves potassium conten.NACP had a notable effect for total sugar and the reducing sugar content of flue-cured tobacco.With theimprovement of N or K₂O fertilizer, total sugar and the reducing sugar content of flue-cured tobacco wasincreased in continuously, significant difference; On the whole, N2K0total sugar, the reducing sugar contentwas in the lowest, and N2K3the highest; Among them, N2K3upper and lower leaves sugar content were themost close to the optimal level, N1K2middle leaves sugar content was the most close to the optimal level.Different N and K₂O dosage and ratio caused significant influence for yield, production value, average price,ratio of mid-high grade leaves and net-profit of flue-cured tobacco.N2K3(N: K₂O=1:4.5, N60kg/hm², K₂O270kg/hm²) had the highest yield, production value, average price and net-profit,and ratio of mid-high gradeleaves was the highest in N2K2(N: K₂O=1:3, N60kg/hm², K₂O180kg/hm²). Increased N fertilizer, with N:K₂O increasing, tobacco yield, production value and economic benefit parameters first increased and thendecreased; Add K₂O fertilizer, with N: K₂O reduced, yield, production value, average price and net-profit offlue-cured tobacco tobacco had a trend of increase, but ratio of mid-high grade leaves depressed when N: K₂Owas1:4.5.Comprehensive consideration, N2K3(N: K₂O1:4., N60kg/hm², K₂O270kg/hm²) treatment had the mostbeneficial to the local tobacco high quality in fitness.