Abstract: In order to solve the problems existing in the production of flue-cured tobacco about low nitrogen and potassium use efficiency and inferior quality by unreasonable fertilizing technology,this project studied the change law of nitrogen and potassium in soil and the accumulation and distribution law in flue-cured tobacco and compared the use efficiency of nitrogen and potassium,yield and quality of flue-cured tobacco by different fertilization modes to filtrate a suitable fertilization mode for Meizhou tobacco production.The experiment with 7 treatments used flue-cured tobacco variety Yunyan 87 as material.Seven treatments respectively were：①Use all nitrogen and potassium as base fertilizer (control);②The amount of nitrogen and potassium is 90% of treatment 1 and 50% use as base fertilizer,50% as topdressing;③The amount of nitrogen and potassium is 70% of treatment 1 and 30% use as base fertilizer,70% as topdressing;④Base fertilizer without nitrogen and potassium and use real-time nitrogen management technique(RTNM) as topdressing;⑤Use 30% of nitrogen and potassium of treatment 1 as base fertilizer,apply RTNM to topdressing;⑥No nitrogen and potassium;⑦The application of nitrogen and potassium is the same as treatment 1 but without organic fertilizer;Topdressing by RTNM made nitrogen and potassium accumulation higher than other treatments.Allocation proportion of nitrogen and potassium in leaves was greater than stem in the aerial parts of tobacco.Compared with the control,top dressed nitrogen and potassium significantly improved the agronomic efficiency(AE),partial factor productivity(PFP),recovery efficiency(RE) and harvest index(HI) of nitrogen and potassium of flue-cured tobacco after transplanting;The comprehensive performance of fertilizer use efficiency in treatment 5 was the best.Its AE of nitrogen and potassium were respectively 38.71% and 37.99%,and RE were respectively 34.24% and 27.52% higher than control.Treatment 5 achieved the highest yield and the output value and the yield and output value were respectively 20.66% and 28.39% higher than control.The chemical constituents of B2F and C3F in treatment 5 were suitable for all treatments.Nitrogen and potassium as "basal+RTNM topdressing" achieved the highest use efficiency of nitrogen and potassium,higher yield and better quality and will be more suitable for application in the production of flue-cured tobacco in Meizhou.

Key words: Flue-cured tobacco, Fertilizer use efficiency, Yield, Quality

CLC Number: 

• S572.01

• S572.06