Different phosphorus activators(PA) were added into southern red soil of China to test their activation capability.The results showed that PA could improve available phosphorus contents in the soil effectively,and activations capability of different activators differed.Results of coeffcient analysis and path coefficient analysis showed that the activations capability order were as follows:Low-molecular weight organic acid>humic acid>sodium humate>ethyl allophanate.Meanwhile,PA could improve Al-P,Ca-P,Fe-P a...