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通过田间取样和室内分析相结合的方法,调查研究了重庆市石柱、奉节和南川3个县烤烟连作土壤的养分状况。结果表明:烟田连作后土壤pH值下降,相邻茬次之间平均下降0.05,土壤酸化;有机质含量逐年下降,相邻茬次之间平均衰减0.56%g/kg;全氮、全磷、全钾含量随连作年限延长表现出不同程度的升高趋势,表现为P(6%～31%)>K(6%～21%)>N(2%～12%);速效磷、速效钾含量随连作年限延长逐年降低,且降低程度P(6%～24%)>K(2%～10%),速效氮含量略有上升;速效养分N/P、N/K和K/P比值明显增加,土壤养分比例失调。
Through field sampling and indoor analysis, the nutrient status of flue-cured tobacco continuous cropping soil in Chongqing Shizhu, Fengjie and Nanchuan were studied. The results showed that the soil pH value decreased after continuous cropping and the average soil acidification was decreased by 0.05 between the adjacent cropping times. The content of organic matter decreased year by year, with an average decay of 0.56% g / kg between adjacent crops.The total nitrogen, total phosphorus, The content of total potassium increased with different years of extension, showing P (6% ~ 31%)> K (6% ~ 21%)> N (2% ~ 12% The content of available nitrogen decreased slightly with the decreasing of P (6% ~ 24%)> K (2% ~ 10%), while the content of available nitrogen increased slightly. The N / P, N / K and K / Significantly increased, the proportion of soil nutrients imbalance.