| Effects of super absorbent polymer application to soil mixed with nitrogenous fertilizer on soil water retention properties |
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| DOI：10.7606/j.issn.1000-7601.2010.02.36 |
| Key Words: super absorbent polymer (SAP) nitrogenous fertilizer soil water retention properties |
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| Abstract: |
| This paper studied three kinds of super absorbent polymer (SAP), Polyacrylamide (PAM), Attapulgite/Polypropylic acid (WT) and Polyacrylate sodium (HM) and their
water absorbing capacity with the solution of 2‰, 5‰ and 8‰ NaCl, MgCl2, CaCl2, FeCl3, CO(NH2)2, KNO3 and NH4Cl, and the effect of SAP application to soil mixed with nitrogenous fertilizer on soil water retention properties. The result showed that the water absorbing capacity of SAP decreased significantly in salt solution and with the increment of solution concentration compared with deionized water. For the same salt solution concentration, the effect of ion type on the water absorbing capacity of SAP was: Na+2+2+3+. The WT showed strong anti ion properties. There were great differences in water absorbing capacity of SAP in different nitrogen solution, and the effect of nitrogenous fertilizer type on the water absorbing capacity of SAP was: CO(NH2)234Cl. The ability of soil water retention had a significantly increasing trend with SAP application to soil mixed with nitrogenous fertilizer, but the nitrogenous fertilizer decreased the water absorbing capacity of SAP. It was recommended that the nitrogenous fertilizer rate didn't exceed 0.50 gN/kg dry soil, SAP rate didn't exceed 6‰ ratio of weight when SAP mixed with nitrogenous fertilizer. |
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