作物叶片持液量与溶液表面张力的关系

将靶标作物水稻、甘蓝苞菜、豇豆和棉花叶片在不同浓度的表面活性剂溶液中浸泡10 s,分别测定其叶片持液量。结果表明:疏水型的水稻和甘蓝包菜,无论溶液内表面活性剂是否达到临界胶束浓度,只要溶液的表面张力大于叶片的临界表面张力,叶面的持液量就少;当溶液的表面张力适度小于叶片的临界表面张力,溶液内表面活性剂达到临界胶束浓度时,其叶面持液量就多;而亲水型的棉花和豇豆的叶面持液量则随溶液表面张力下降而减少。

The Relationship between Maintained Quantity of the Liquid by the Leaves of Crop and the Surface Tension of the Liquid

The maintained quanta of the liquid by the leaves of rice, cabbage, cowpea and cotton were tested by dipping foliage of these plants in different concentrations surfactant liquid for 10 s, respectively. The results showed that no matter whether the surfactant reached the critical micelle concentration in the liquid, the maintained quanta of the liquid by leaves in rice and cabbag were a litde if the surface tension of the liquid was larger than the critical surface tension of the leaves. The maintained quanta of the liquid by leaves in rice and cabbag were more if the surface tension of the liquid was smaller than the critical surface tension of the leaves and the surfactant reached the critical micelle concentration in the liquid. The amintained quanta of liquid by the leaves of cowpea and cotton were reduced in the wake of the surface tension of the liquid came down.