Method for determining optimal nitrogen fertilizer application amount of flue-cured tobacco

Abstract

The invention discloses a method for determining the optimal nitrogen fertilizer application amount of flue-cured tobacco. No control groups are set, five repeating groups are set, 201 pieces of flue-cured tobacco are adopted in each repeating group, the nitrogen application amount is set for each piece of flue-cured tobacco, the nitrogen application amount of each piece of flue-cured tobacco is continuously increased, and the consistent nitrogen, phosphorus and potassium ratio of each piece of flue-cured tobacco is guaranteed; 8-12 days after topping, the suitable interval of the optimal nitrogen element application amount is visually and preliminaryly determined according to the good mature appearance condition of tobacco plants; the single flue-cured tobacco plant in normal good mature appearance is harvested and baked, the appearance quality, the main chemical component content and the sensory evaluation quality of baked tobacco leaves are comprehensively analyzed, the suitable nitrogen element application amount range which is preliminaryly obtained is adjusted, and therefore the optimal nitrogen application amount range can be finally determined. According to the normal layering good mature appearance condition of tobacco plants, and the appearance quality and the internal quality of the baked tobacco leaves, the suitable nitrogen element application amount range is visually and accurately determined; the suitable nitrogen element application amount range is obtained, not a certain nitrogen application level is obtained, and therefore the obtained suitable nitrogen element application amount is more accurate compared with an existing method.

Description

technical field [0001] The invention relates to a method for determining the optimum nitrogen fertilizer application rate of flue-cured tobacco, which belongs to the field of agricultural production. Background technique [0002] Fertilization is one of the important technical links in flue-cured tobacco planting. Among the three elements of nitrogen, phosphorus and potassium, appropriate application of phosphorus and potassium fertilizers generally does not have much adverse effect on the yield and quality of tobacco leaves, but nitrogen fertilizer is different. Due to the large differences in soil and climate conditions in various places, the physical and chemical properties of the soil are different, the amount of residual nitrogen in the previous crops is different, the annual rainfall is unevenly distributed, and the types and application methods of fertilizers are different. The absorption and utilization rate of nitrogen in the medium and nitrogen in the fertilizer i...

AI Technical Summary

Problems solved by technology

However, the conventional nitrogen dosage test design can only determine the appropriate interval of the optimal nitrogen dosage based on experience and test results, and it is difficult to determine the appropriate interval of the optimal nitrogen dosage intuitively and effectively.