Effect of Potash Fertilizer on Cold Resistance of Kales

Taking kales as material,the experiment adopted the single factor randomized block design to study the effect of potash fertilizer on cold resistance.There were four K concentration treatments: A(0.66%),B(0.69%),C(0.73%),D(0.77%) and a control treated with water.In Rosette stage,we tested the changes of physiological indices in leaves about cold resistance,such as total water content,content of soluble sugar,membrane permeability and content of MDA etc.The results showed the total water content of leaves increased with the increasing of K fertilizer utilization,and treatment C was the highest,followed by treatment D.However,they were all lower than control.The content of soluble sugar increased with the increasing of K fertilizer utilization too.The changes of membrane permeability and content of MDA were not obvious.It could be concluded that at the test about membrane permeability treatment C could enhance cold resistance,while treatment A and D could enhance cold resistance at the test of content of MDA.