The effects of applying magnesium, boron and molybdenum fertilizer on the yield and quality of flue-cured tobacco variety NC297 in purple-soil mountainous region were studied through field experiment. The results showed that applying magnesium, boron and molybdenum fertilizer in the purple soil could effectively promote the growth of tobacco plants,prolong its growth period, improve the agronomic characters of tobacco plants, and enhance the economic benefits and industrial availability of baked tobacco leaves. The tobacco plants in the treatment T4(simultaneously applying magnesium,boron and molybdenum fer-tilizer)possessed the best economic traits and chemical compositions; the flue-cured tobacco in the treatment T2(only applying boron fertilizer)had the best smoking quality;the various indexes of flue-cured tobacco in the treatment T3(only applying molyb-denum fertilizer)were middle or upper; the flue-cured tobacco in the treatment T1(only applying magnesium fertilizer)had the best leaf grade structure; the flue-cured tobacco in the treatment CK had more harmonious chemical compositions, but its other indexes were worse.%以NC297为材料,通过田间试验研究了施用镁硼钼肥对山地紫色土烤烟产质量的影响.结果表明:紫色土施用镁、硼、钼肥能有效促进烟株早生快发,延长生育期,改善烟株农艺性状,提高烤烟经济效益、工业可用性;同时施用镁、硼、钼的T4处理的经济性状、化学成分最好,施用硼的T2处理评吸质量最好,施用钼的T3处理各项指标中偏上,施用镁肥的T1处理烟叶等级结构最好,CK处理除化学成分协调性较好外,其他指标均较差.
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