**2. Research advance**

Their source include: root exudates, microorganisms, animals, and the degradation of organic matters. The LMWOA, as one of the typical rhizosphere active components presenting in soil and a key molecule in the solubilization of phosphorus-containing crystalline or amorphous minerals or as a desorbing agent for orthophosphate adsorbed on other soil minerals, is sure to have an influence on the existing state of organochlorine pesticides in soil and on the interaction between organochlorine pesticides and soil colloids.
