“克旱寒”是内蒙古生产的一种黄腐酸盐类产品。我们在 1998年初步试验的基础上 ,1999年在苹果树早期落叶病和苹果树干腐病的防治上 ,对该产品正式进行试验。现将 1999年的试验结果介绍如下。　　 (1)试验材料和方法　 1“克旱寒”防治苹果早期落叶病试验 ,试验地选在辽宁省绥 “Khan Han” is produced in Inner Mongolia a fulvic acid salt products. Based on preliminary tests conducted in 1998, we formally tested the products on prevention and control of apple tree deciduous apple blight and apple tree rot in 1999. Now the test results in 1999 are as follows. (1) Test Materials and Methods 1 “Khan Han” prevention and control of apple early leaf deciduous disease test, selected in Liaoning Province Sui