【摘要】 2004年在云南省91个烟叶主产县(区)采集683个植烟耕层土壤进行分析。结果表明,云南植烟土壤有机质和全氮含量变幅较大,平均含量分别为33.0 g.kg-1和1.9 g.kg-1,两者处于Ⅰ级和Ⅱ级高水平含量的土壤样本分别占54.3%和68.3%。碱解氮含量平均140.8 mg.kg-1,处于Ⅰ级和Ⅱ级高水平含量的土壤样本占63.1%。不同植烟土壤类型有机质和全氮含量差异较大,其中水稻土含量较高,紫色土次之,红壤及黄壤含量相对较低。更多还原

【Abstract】 683 soil samples were collected and analyzed in 2004 from 91 major tobacco growing counties in Yunnan province.The results showed that organic matter and total nitrogen were rich in the soils,but the value varied greatly,the average value was 33.0 g·kg^-1 and 1.9 g·kg^-1 for organic matter and total nitrogen respectively.The content of organic matter and total N in Ⅰand Ⅱ grades accounted for 54.3% and 68.3% respectively.The mean of available nitrogen was 140.8 mg·kg^-1 of all the samples and in Ⅰand Ⅱ grades accounted for 63.1%.There was a great change in both organic matter and nitrogen for different soil types.In general,paddy soils had the highest value then followed by purple soil,the lowest value went to red soil and yellow soil.更多还原