河南省不同茬口烟田土壤养分状况评价

通过对河南省不同茬口烟田的1145个土壤样品分析，评价了全省主要茬口植烟土壤的养分现状。结果表明，主要茬口(烟草、玉米、豆类、甘薯、其它作物)土壤有机质含量均较适宜于优质烟生产，其平均含量由高到低顺序为玉米、其它作物、烟草、豆类和甘薯；各茬口土壤有效氮由高到低排列为玉米、甘薯、其它作物、豆类和烟草，其中玉米、甘薯和其它作物茬分别有30.7％、21.7％和19.2％的土壤有效氮含量高于100 mg/kg，需注意控氮；各茬口土壤速效磷平均含量都在中等偏上水平；土壤速效钾含量以烟草茬最高，其它各种茬口由于农民不注重钾肥的投入，土壤速效钾含量相对较低；各茬口土壤水溶性氯含量普遍适宜；各茬口土壤有效锌含量由高到低顺序为豆类、烟草、甘薯、其它作物和玉米，有50％以上的烟田需补施锌肥；各茬口土壤有效硼含量普遍缺乏。 

Evaluation of nutrients status in tobacco planting soils under different cropping systems in Henan province

The nutrients status of tobacco planting soils under different cropping systems in Henan was evaluated by analyzing 1 145 soil samples.Results showed that soil organic matter content in soils of all cropping systems,including tobacco,maize,legume,sweet potato,and other crops,Was suitable for high-quality tobacco production.Average content Was in the order of maize-tobacco rotation(m-t)>other crop-tobacco rotation(o-t) >continuous planted tobacco(c-t)>legume crop-tobaccorotation(l-t)>sweet potato-tobacco rotation(s-t).Soil available N content Was in the order of m-t>s-t>o-t>l-t>c-t,and percentage of soils in which available N content was higher than 100mg/kg were 30.7%,21.7%,and 19.2%underm-t,s-t and o-t.respectively.The amount of N application should be controlled for these soils.Content of soil available P was medium to hiigh.Content of soil available K in c-t Was the higheat while that in others were relatively low due to less K fertilizer input.Content of soil water-soluble C1 was suitable in all cropping systems studied.The order of soil available Zn content was l-t>c-t>s-t>o-t>m-t and over 50%soils of all cropping systems studied were Zn deficient while almost all soils studied were available B deficient.