陕南山地烟田不同植烟年限土壤养分的变化

Nutrient distribution in soil for tobacco planting over different years in southern Shaanxi mountainous region

为给陕南山地烟草生产布局及有针对性的施肥措施提供依据,分析了陕南山地烟田不同植烟年限（0~15年）与土壤养分含量的关系。结果表明：随着植烟年限延长,有机质线性下降,全氮和速效钾显著上升,有效磷先上升后下降;氯、有效铁、有效锰、有效硼和有效铜无显著变化或变化很小,有效锌则在第1年急剧下降,之后保持稳定,10年后再次显著下降。认为陕南山地烟区烟叶生产中应适当增加有机肥的施用而合理控制氮肥、磷肥和钾肥的施用,并要注意锌肥的补充。

In order to facilitate arrangement of tobacco production and targeted fertilization, nutrient distribution in soil for tobacco planting over different years（0~15） in southern Shaanxi mountainous region was studied. Results showed that with the increase of tobacco cropping years, the organic matter content decreased while total nitrogen and available potassium content increased. Available phosphorus content increased first and then declined. There were no significant or slight differences in chlorine, available iron, effective boron, copper and manganese content in soil of different cropping years. Available zinc content in tobacco cropping soil was lower than that in soil before tobacco cropping. There was no significant difference in available zinc content in the first 10 planting years, but it significantly decreased after planting for 10 years.