Effects of different combinations of proportion of organic and inorganic fertilizer on the dynamic changes of pH and organic matters and humic acid in the tobacco planting soil are studied through the field comparative experiments. The results show that different ratios of combinations of organic and inorganic fertil-izers have different effects on the dynamic changes of pH and organic matter composition. After 20 days of transplanting, the rhizosphere pH increases with the amount of organic nitrogen application increasing. While after 120 days of transplanting, the rhizosphere pH gradually decreases with the amount of organic nitrogen application increasing. There are no acidification issues for rhizosphere soil even with 100% application of in-organic fertilizer in this experiment. When the ratio of organic nitrogen is above 25%, the constituents of or-ganic matters and humic acid increase with the amount of organic nitrogen application increasing. However, considering the growth of tobacco, ratio of input and output, quality of tobacco leaves and the care for soil, yield and quality of flue-cured tobacco, it is appropriate to keep the ratio of organic nitrogen at 25%.%通过田间对比试验,研究有机无机肥配施对植烟土壤pH和有机质、腐殖酸含量的动态变化影响.结果表明:不同有机无机肥配比植烟土壤pH和有机物成分动态变化规律不同.移栽后20天,根际土壤pH随有机氮施用量的提高而提高;移栽后120天,根际土壤pH随有机氮施用量的提高呈递减趋势;100%施用无机肥并没有引起根际土壤酸化的问题.有机氮比例在25%以上,根际土壤的有机质和腐殖酸含量随有机氮施用量的提高而提高.结合烤烟产质量因素,有机氮施用比例以25%为宜.
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