贵州烟区紫色土与其它土壤类型养分特点的差异

为合理利用贵州烟区紫色土及其它类型土壤资源,2001年在全省有代表性的植烟土壤上采集了948个土壤样品,测定了有机质、氮磷钾、pH值、水溶性氯、有效硫、交换性钙、交换性镁及部分微量元素的含量,分析了贵州烟区紫色土与其它土壤类型养分特点的差异。结果表明:紫色土相对于其它土壤类型,其有机质、氮素、磷素含量偏低;全钾含量较高,速效钾含量偏低;土壤pH值与其它类型土壤差异不显著,大部分在中性至微酸范围内,较适合烤烟生长;水溶性氯含量过低,难以满足优质烤烟生长需要;有效硫含量中等;交换性钙、镁含量偏高;微量元素中有效铁、锰含量丰富;有效铜、锌、钼含量中等,但与其它土壤相比稍低,需适当补充;有效硼含量普遍较低,建议增施硼肥。

Difference of Nutrients between Purple Soil and Other Soil Types in Guizhou Tobacco-growing Areas

948 soil samples were measured their contents of organic matter,total N,total P,total K,hydrolytic N,available P,available K,pH values,water soluble Cl,available S,exchangeable Ca,exchangeable Mg and partial microelements to investigate the difference of nutrient characteristic between the purple soil of Guizhou tobacco field and other soil types for utilizing rationally the soil resources.The results showed that the purple soil had the lower contents of organic matter,total N and hydrolytic N,total P and available P;and higher content of total K but lower content of available K compared with other soil types;pH values had no significant difference between purple soil and other soil types;most of the soil samples with neutral to slightly acid pH was suitable for growth of flue-cured tobacco;the content of water soluble Cl was too low,which could not satisfy the growth of high quality flue-cured tobacco;the content of available S was medium;contents of exchangeable Ca and exchangeable Mg were slightly high;the purple soil was rich in available Fe and available Mn;the contents of available Cu,Zn and Mo were medium,but were slightly lower than those of other soil types.Because the content of available B was lower,applying B fertilizer was essential for tobacco growth.