通过田间试验，研究了同等施氮水平下，不同用量的P、K、Mg相互作用对烤烟产量及叶内化学成分的影响。试验表明，平衡施肥是目前烟叶生产中关键技术之一。同时还证实在长期或前茬施用较多磷肥的烟田中，应适当降低磷肥的施用比例，并在施用N、P、K的基础上适量配施中量元素，这对改善烟叶的经济性状及协调叶内化学成分有良好的效果。 Field experiments were conducted to study the effects of P, K and Mg interactions on the yield and chemical composition of leaves in flue-cured tobacco at the same nitrogen level. Experiments show that balanced fertilization is one of the key technologies in tobacco production. At the same time, it was also confirmed that in the long-term or previous stubble application of more phosphate fertilizer in tobacco fields, the proportion of phosphate fertilizer should be appropriately reduced and the amount of medium-amount elements should be applied on the basis of N, P, K, Coordination of the chemical composition of the leaves have a good effect.