Study on key parameters of fertilizer application for flue-cured tobacco in Longyan
In order to study the fertilizer effect of flue-cured tobacco under different fertilizer dosage and determine the appropriate fertilizer application dosage,a field experiment was carried out in Longyan city,Fujian province,using Yunyan 87,the local main cultivar,as the material.The effects of combined application of nitrogen(N),phosphorus(P)and potassium(K)fertilizers on nutrient uptake,relative yield,nutrient factors limiting yield,economic characteristics and fertilizer utilization rate of flue-cured tobacco were studied.The results showed that the nutrient accumulation of N,P and K was K＞N＞P during the growth period of flue-cured tobacco,and the nutrient accumulation mainly concentrated in the flourishing period.The yield and economic properties of flue-cured tobacco in Longyan tobacconic area were reduced by lack of nutrients.The effects of lack of nitrogen,phosphorus and potassium on yield and economic properties of flue-cured tobacco were as follows:lack of nitrogen＞lack of phosphorus＞lack of potassium.In different nitrogen application treatments,N3 treatment(N:135 kg/hm2,P2O5:105 kg/hm2,K2O:375 kg/hm2)had the best indicators.The yield was 2053.17 kg/hm2,the proportion of high-grade tobacco was 79.64％,the proportion of medium-grade tobacco was 95.64％,the output value was 61850.36 Yuan/hm2,the average price was 30.12 Yuan/kg,the nitrogen utilization rate was 31.27％,the agronomic utilization rate was 11.28 kg/kg,and the partial productivity was 15.21 kg/kg.Nitrogen application and tobacco yield were fitted with the fertilizer effect equation,which was y=511.488+1.3614x+0.116x2-0.0004x3(R2=0.9812).Considering tobacco yield,fertilizer utilization rate and economic benefit,the recommended nitrogen application rate in Longyan area is 135.0-177.2 kg/hm2.
flue-cured tobacconitrogen,phosphorus and potassiumrecommended fertilizationfertilizer effect equation
万方数据
维普
