ulmin

If such effects as stimulating the growth of plants,improving the soil condition are to be guaranteed,the content of fulvic acid and hymatomelanic acid,which are the available component of humic acid,as well as the base exchange and phenolic hydroxyl amount are required.

当用腐植酸(HA)生产有机无机肥时,并非任何腐植酸均可用,如要保证其刺激作物生长和改良土壤等作用,对腐植酸的速效成分黄腐酸(FA)和棕腐酸(HyA)的含量、盐基交换量、酚羟基含量均有一定要求。