Effects of One-time Application of Controlled-release Integrated Fertilizer on Photosynthetic Traits and Yield of Tobacco 'Yunyan 87'
The effect of one-time application of controlled-release integrated fertilizer on photosynthetic traits and yield was investigated,to provide technical support for the application of controlled-release integrated fertilizer in tobacco production.The tobacco cultivar 'Yunyan 87' was selected as the experimental materials in a field experiment in Liangshan tobacco-growing area of Sichuan Province.Three fertilizer treat-ments were set up:local conventional fertilizer (T1),750 kg/hm2 controlled-release integrated fertilizer (T2) and 900 kg/hm2 controlled-re-lease integrated fertilizer (T3). The stand type characteristics,leaf chlorophyll content,areas of green leaves,hotosynthetic rate at flat top stage,and the yield were investigated. Compared with conventional fertilization,one-time application of controlled-release integrated fertilizer enhanced the average stem circumference,SPAD value of upper leaves,areas of green leaves and net photosynthetic rate of 'Yunyan 87'.The application of controlled-release integrated fertilizer (T2 and T3) increased the yield by 8.19％ and 13.80％,respectively,and significantly in-creased the yield of Zhongju 3 and Zhongju 2,the output value increased by 6058.95 and 12874.65 yuan /hm2,respectively.Increasing the amount of fertilizer could significantly enhance the SPAD value and net photosynthetic rate of the upper leaves of 'Yunyan 87',which followed by higher yield and output value.The variation of yield and output value between different fertilizer treatments might be caused by difference of photosynthetic functions of upper leaves.In conclusion,compared with the traditional multiple fertilization,the application of controlled-release integrated fertilizer is beneficial to promote the development of upper leaf,improve tobacco yield,optimize grade structure and increase output value.Appropriately increasing the application amount of controlled-release integrated fertilizer could improve the yield and output value of to-bacco.For 'Yunyan 87',the effect of increasing yield was more obvious when the application amount of controlled-release integrated fertilizer was 900 kg/hm2.
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