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以当地生产推荐施磷量为对照,通过田间试验研究了低磷和高磷对烤烟打顶时(即赤星病发病初期)健康烟株烟叶中类黄酮、总酚、可溶性糖和游离性氨基酸4种生理生化物质含量、后期赤星病发病情况以及烟叶产质量的影响。结果表明,打顶时烟叶中类黄酮、总酚和可溶性糖的含量随施磷量增加而下降,其中高磷和低磷两处理间差异显著;而烟叶中游离性氨基酸的含量则以中等施磷量处理(当地推荐施磷量)显著大于低磷和高磷两处理。不同时期的赤星病发病率均呈现出随施磷量增加而增加,病情加重的趋势。烤后烟叶产量、产值在不同施磷量处理间差异不明显,但以低磷处理略微稍高;同时低磷处理烟叶两糖差相对较好,但糖碱比相对偏低。建议生产中的磷肥施用量应适当下调,以略高于低磷处理用量为宜。
Based on the local production of recommended phosphorus application, the effects of low phosphorus and high phosphorus on tobacco leaf flavonoids, total phenols, soluble sugar and free amino acid 4 Physiological and biochemical substances, the incidence of later brown spot disease and the quality of tobacco leaves. The results showed that the contents of flavonoids, total phenols and soluble sugars in tobacco leaves decreased with the increase of phosphorus application, and the difference between high and low phosphorus treatments was significant. The content of free amino acids in tobacco leaves was moderately applied Phosphorus treatment (locally recommended phosphorus) was significantly greater than the two treatments, low phosphorus and high phosphorus. The incidence of brown spot disease in different periods showed a trend of increasing with the increase of phosphorus application. After roasting, the leaf yield and output value were not significantly different among different treatments of phosphorus application, but were slightly higher with low phosphorus treatment; while the difference of two sugars in low phosphorus treatment was relatively good, but the ratio of sugar to base was relatively low. It is recommended that the amount of phosphate fertilizer used in production should be appropriately reduced to a level slightly higher than that of phosphorus treatment.