Abstract:

In this paper, the effects of different fertilization levels on dry matter accumulation and nutrient accumulation and distribution in flue-cured tobacco were discussed, so as to provide a scientific basis for developing yield potential and optimizing fertilization management. Four fertilization levels (no fertilization, low fertilization level, medium fertilization level and high fertilization level) were used to study the content changes and the distribution characteristics of dry matter, nitrogen, phosphorus and potassium in roots, stems and leaves of flue-cured tobacco. The results showed that: (1) the dry matter accumulation of tobacco plants increased with the growth process, and there was no significant difference in leaf dry matter, phosphorus and potassium accumulation among different fertilization treatments at the dome stage; (2) with the increase of fertilization level, the utilization rate of nitrogen and potassium of tobacco plants decreased, and the utilization rate under high fertilization level was significantly lower than that under low fertilization level. Under the condition of this experiment, it is difficult to improve the yield (dry matter accumulation) of flue-cured tobacco by increasing the amount of fertilizer. In practice, it is recommended to apply fertilizer at medium level of 150.0 kg/hm² (N: P₂O₅: K₂O=1.0:0.8:2.0).

Key words: fertilization level, flue-cured tobacco, dry matter, nutrient, accumulation and distribution