Effects of super absorbent polymer on nutrient retaining property in soils with different textures
Using different dosage of super absorbent polymer (SAP)and same dosage of potassium sulfate,a pot ex-periment was carried out to investigate the effects of different dosage of SAP on nutrient retaining property in three soils with different textures .The results show that:(1 )SAP could reduce potassium ion concentration in the soil eluent, which was negatively correlated to dosage of SAP .This meant that SAP improved the potassium retaining capacity of the soils with different textures .(2)The effect degree of SAP to nutrient retaining capacity was different among the three kinds of soil,which could be ordered as:sand >loam >clay .(3)SAP increased significantly the residue of potassi-um sulfate in the soils .In sand,loam and clay,the application of 0 .25% SAP could save potassium by 25 .5 1%, 4 .70%and 2 .06%,respectively,compared with the control .Therefore,SAP was remarkably effective in retaining soil fertility,and it could reduce the leaching loss of soluble nutrients to a certain extent .
super absorbent polymer (SAP)soil texturesoil nutrient retaining capacitysoil leachingpotassium ion concentration
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