水田土壤的外附力是指它对钢、橡胶、塑料等材料表面的附着能力。土壤的内聚力是指它本身的粘聚能力。水田土壤是否会大量粘积于某种材料表面,是由这两种力决定的。如外附力很小,土粘不上去。如外附力虽大但内聚力很小,土只能粘上去薄薄一层,不会越粘越多。只有这两种力都达到一定值时,土才能粘上材料表面,而且越粘越多,直到因为太多而掉下来为止。 SF-1型水田土壤外附力内聚力测定仪,就是一 Paddy soil external force refers to its steel, rubber, plastic and other materials surface adhesion. Soil cohesion refers to its own ability to cohesion. It is up to these two forces whether paddy soil will accumulate in large amounts on a material surface. If the external force is small, the soil can not stick to it. Such as the external force is large but cohesion is small, the soil can only be a thin layer of glue, will not stick more. Only when both forces reach a certain value can the soil stick to the surface of the material, and the more sticky the more until it falls too far. SF-1 type paddy soil external cohesion tester, is one