不同氯化钾施用措施对烤烟上部叶产质量的影响.

[Objective] To explore the potassium chloride application measures suitable for Luzhou tobacco planting area and further improve the regulation technology of upper tobacco leaves in the field. [Method] A field experiment was conducted with Zhongchuan 208' as the test material. Four potassium chloride application rates of 30,60,90 and 0 kg/hm² were set. The ratio of base fertilizer to topdressing was 5: 5. The topdressing period was set at 30 and 50 d after transplanting, with a total of seven potassium chloride application methods. The changes of agronomic characters, SPAD value, economic characters, chemical composition and physical characters of upper tobacco leaves were analyzed. [Result] Compared with no application of potassium chloride, the application of potassium chloride increased the yield, output value, average price and the proportion of medium and high-grade tobacco by 3.11%-9.17%,6.12%-19.29%, 2.79%-12.92% and 4.01%-18.25% respectively. The color, maturity, body, oil content and chroma of flue-cured tobacco were improved, and the comprehensive score was increased by 1.15%8.30%. [Conclusion] Applying 30 kg/hm² potassium chloride as base fertilizer and applying 30 kg/hm² after transplanting for 50 days has the highest economic benefit. The appearance quality, chemical composition and physical properties of the upper tobacco leaves after baking get the highest score. [ABSTRACT FROM AUTHOR]