红云集团原料基地植烟土壤质地和pH特性研究*

 对红云集团3省23基地县（区）植烟土壤的质地和pH状况进行了分析。结果表明：①土壤质地均为壤土或轻粘土，壤土占85%以上；3个基地省中，以福建质地最砂，云南居中，贵州最粘；23县（区）中，以福建明溪质地最砂，贵州江口最粘；②借助聚类分析，基地县（区）土壤质地由砂到粘被分为5类，第1类为轻中壤型，后4类为中重壤型，仅在中重壤所占比例上存在差异；③有4134%的植烟区属pＨ55～75的适宜区，有572%属极强酸性和强碱性等不适宜烤烟生长的区域；④基地县（区）pH状况经聚类分为3类：一是强酸、微酸、中性、微碱均衡并存型，二是强酸为主，极强酸、微酸均势并存型，三是强酸、微酸型。

Study on the Texture and pH of Tobacco-planting Soil of Material-Base in Hongyun Tobacco Group

The characteristics on soil texture and alkalinity in material base counties were studied in this paper.The results showed that all of 23 counties’ soil textures were all constituted of loam soil and light clay.Among 3 base provinces，Fujians soil texture was the most sand，Yunnan was middle，Guizhou was the most clay.Among 23 counties，Minxi was the most sand，Jiangkou was the most clay.Soil textures of material base were classified into 5 types，type 1 was light and middle loam soil，the other 4 types were middle and heavy loam soils which were only different in their percentage.In material base of Hongyun Tobacco Group，the pH of the tobacco planting soil which accounted for 4134% was suitable to planting tobacco，but the pH of the tobacco planting soil which accounted for 572% was not suitable to planting tobacco.The pH of tobacco planting soilin 23 material base counties was classified into 3 types by cluster analysis.The first type was strong acid，tiny acid，alkalescence，the second type was mighty acid and tiny acid，and the third type was strong acid and tiny acid.