| Soil fertility is an important indicator of measuring soil for agricultural production base and crop production capacity. In this study, field experiments and indoor analysis were carri ed out to study the effect of different N, P, K fertilizer levels on tobacco crop yield in Shaoya ng, Jincheng and Tangtian town of Hunan province. The objectives of this study were to imp rove soil fertility and quality of tobacco production by the scientific fertilization technology, and to strengthen agricultural scientific management, promoting agricultural sustainable dev elopment and rational utilization of resources to provide theoretical basis and technical supp ort. The main results of the paper were as follows:(1) The pH value showed small variation, while the content of soil organic matter decreased with an average value of 15.2 g/kg. The content of soil total nitrogen was relatively higher, with a suitable area of 67%a nd 63% in Tangtianshi and Jinchenshi, respectively. But soil hydrolytic N content was relatively lower, which were at very low level and low level, respectively. Soil total P and total K contents decreased and their variations were large. Soil available P content increased, while the available K was lower in Tangtianshi. Soils developed from river sediment and Quaternary red clay had high nutrient contents, but soil developed from limestone had lower nutrient content.(2) The experimental results showed that field, the native contribution of tobacco soil for production of flue-cured tobacco was much smaller, and the economic product yield of flue-cured tobacco of no fertilizer plot only accounts for 30% that of the balanced NPK fertilization plot (treatment 6). In this study, the fertilizer which had the largest increasing production for economic yield is nitrogen, which had the increased production was 1060.51 kg/hm2、476.4 kg/hm2 and 585.3 kg/hm2. Fertilizer effects model with binary quadratic fit each test point "3414" trial data are not successful, the point "3414" test data should use a quadratic equation model fitting, and its optimum fertilization rate in this experiment condition were N 175.02 kg/hm2、P2O5105.59 kg/hm2、K2O 150.56 kg/hm2 respectively.(3) Field test results showed that treatment 6 is the highest than the others, total absorption the test points flue-cured tobacco on the ground part of the nitrogen, phosphorus and potassium were 105.8 kg/hm、16.03 kg/hm、131.02 kg/hm2.The upland growth of flue-cured tobacco absorption of nitrogen, phosphorus and potassium were mainly to transfer in tobacco leaves, Tobacco average absorption of nitrogen, phosphorus and potassium proportion of flue-cured tobacco on the ground portion of the total absorption of 62.08%, 14.49% and 67.03%.The amount of the upland growth of flue-cured tobacco absorption of nitrogen, phosphorus and potassium to transfer in the tobacco leaves was almost same on the same experiment points, the nutrient uptake of K> N> P.(4)Field test results showed that different fertilizer treatments have obvious increasing production effect,Tobacco production of Ziyunying+Single quality fertilizer is 2098.5 kg/hm,phosphorus and potassium proportion of flue-cured tobacco on the ground portion of the total absorption of 4.18 kg/hm2、73.75 kg/hm2,Rape straw+Single quality fertilizer The most that flue-cured tobacco on the ground part of the nitrogen is 61.89 kg/hm2.so 5 of treatment effect is the best.The data test simulation results, the best balance of three test points tobacco fertilization fertilizer 6 is reasonable, was N 175.02 kg/hm2、P2O5105.59 kg/hm2、K2O 150.56 kg/hm2.Different organic fertilizer processin that 5 of treatment effect is the best. |
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