土壤湿度对香料烟根系发育和根系活力的影响

研究了香料烟两个主要栽培类型, Ｂａｓｍ ａ（芳香型）和 Ｓａｍ ｓｕｎ（吃味型）,在不同土壤湿度条件下的根系发育和根系活力,结果表明土壤适度干旱处理（土壤相对含水量６０％ ）两类型的根系干重、吸收面积和活跃吸收面积的测定值均高于其他处理。在土壤相对含水量６０％ ～８０％ 的处理条件下, Ｓａｍ ｓｕｎ 类型上述项目测定值均高于 Ｂａｓｍ ａ 类型;而土壤相对含水量在４５％ ～３５％ 的条件下, Ｂａｓｍ ａ 类型的项目测定值高于 Ｓａｍ ｓｕｎ 类型。

Effect of Soil Humidity on Aromatic Tobacco Root System Development and Activity

The root system development and activity of two main tobacco cultivars, Basma type and Samsun type, was studied under the conditions of different soil humidity. The result showed the dry matter weight, the values of absorption area and active absorption area of roof system of the two types,in the proper drainage treatment were much higher than these in other treatments. The values mentioned above of Samsun type in soil water content of 60%～80% were higher than these of Basma type, but quite opposition in soil water content of 35%～45%.