Abstract:

To study the effect of nitrogen reducing fertilization on the growth, yield and quality of flue-cured tobacco under the integration of water and fertilizer in low altitude area of Ankang, taking the nitrogen fertilizer 90 kg N/hm² (base fertilizer) as control (CK), we set 3 treatments with nitrogen reducing [75 kg N/hm² (base fertilizer + drip irrigation fertilizer), 67.5 kg N/hm² (base fertilizer + drip irrigation fertilizer) and 60 kg N/hm² (drip irrigation fertilizer) to carry out the comparative experiment. The results showed that: (1) with the advance of growth process of tobacco, the difference of agronomic traits under different treatments had an increasing tendency; there was no significant difference among the treatments at rosette stage; the length of internode of N60 was the longest and the stem diameter of N60 was the shortest in the fast growing period, the joint speed of N60 was the fastest but the plant was not strong, the performance under N75 was the best; the difference at the top plate phase was N90=N75>N67.5=N60; (2) the difference between appearance quality and intrinsic quality of flue-cured tobacco under different treatments was N90=N75>N67.5>N60; the average price and sensory evaluation quality of N75 were the best; the difference of yield and output value was N90>N75>N67.5>N60. The dosages of nitrogen reduced by 16.7% compared with local conventional N application rate could have little effect on the production of flue-cured tobacco, and is beneficial to improving the quality of tobacco leaves; and the combined application of base fertilizer and water-soluble drip irrigation fertilizer is suitable for nitrogen reducing fertilization.

Key words: Flue-cured Tobacco, Integration of Water and Fertilizer, Nitrogen Reducing, Low Altitude Area, Effect, Ankang