施钾对增强大豆抗旱性的影响

施钾提高了大豆植株含钾量，产生一系列的抗旱特性如：根，茎，叶的维管束的发达，利于吸收和贮存水分及养分。由于细胞壁和厚角组织厚，保水力强，在高温条件下，能抗高温。质膜透性小，气孔阻力大，蒸腾速度减慢，束缚水含量高等。故大豆施钾可提高抗旱性而增产。

EFFECT OF POTASSIUM APPLICATION ON PROMOTION DROUGHT RESISTANCE OF SOYBEAN

Potassium application increases potassium content in soybean plant and gives rise to some physiological characteristis relating to drought resistance. Such as, developed vascular bundle of root, stem and leaf favor absorption and reservation of water and nutrients; the thick cell wall and selerenchyma increases the ability of water reserve; lower membrane permeability bring about higher resistance to high temperature ; larger stom-atal resistance decreases water evaporation. Potassium application also increases the content of bond water in plant cell. The yield of soybean was increased significantly by-potassium application during drought conditions.