Effect of different P contents on Zn & Cd secondary adsorption and desorption in cinnamon soil

The paper studied on the effects of different P adsorption contents soil on Zn Cd secondary adsorption and desorption in cinnamon soil.The results showed that the P desorption amounts increased with P adsorption amounts increased after secondary adsorption Zn Cd,but the P desorption amount decreased with secondary adsorption Zn Cd amount increased,so it could say that P availability decreased with added Zn Cd amount increased.The zinc secondary adsorption amount and adsorption rate decreased first and then increased with the P adsorption amount increased,and it decreased with added Cd quantity increase.And zinc desorption amount and desorption rate increased with P adsorption quantity increased.It could explain that during the normal P added amount,increased the phosphorus usage could improve the zinc availability in the soil.Meanwhile,the secondary adsorption rate of high concentration Zn treatments was less than that of the low concentration Zn treatments,while the Zn desorption amount and desorption rate of high concentration Zn treatments was more higher than that of low concentration Zn treatments.The Cd secondary adsorption amount,adsorption rate and desorption amount,desorption rate increased with the P adsorption quantity increased,and adsorption amount increased with added Cd quantity increased.But Cd secondary adsorption amount and adsorption rate decreased with added Zn quantity increased,while its desorption amount and desorption rate increased.It could explain that when P adsorption amount was the same,increased Zinc added amount could improve Cd availability.