Soil Loss Mitigation Using Synthetic Polymer Under Simulated Condition

Sheila G. Griengo, Romeo B. Gavino, Victorino T. Taylan, Sylvester A. Badua

Abstract


Abstract

One of the effects of climate change is soil degradation which is mostly due to soil erosion. The use of anionic polyacrylamide (PAM) as a soil stabilizer is an emerging conservation practice for mitigating soil loss. PAM can be an alternative to traditional soil erosion control practices rather than mulching and slope profiling to control erosion. Generally the study aimed to assess the effect of using synthetic polymer (PAM) in mitigating soil loss under simulated condition. Specifically it attempted to install a locally fabricated rainfall simulator (spray-nozzle type) to evaluate the effectiveness of PAM at different rates (no PAM, 7.4 g of PAM per kg of soil and 14g of PAM per kg of soil) at different slope gradients (10, 35 and 60 degrees) and analyze the relationship of slope gradient versus sediment yield, and soil loss at different rainfall intensities.  Different rates of PAM were applied in soil test boxes filled with medium loam of soil under simulated condition. Runoff volume was then collected every event to determine the sediment yield and soil loss. Data were analyzed using the Split-plot design with three replications and a regression analysis to determine their relationships. The results indicated that PAM applications significantly reduced sediment yield and soil loss at different rainfall intensities. The most effective rate of PAM applied in mitigating soil loss was found to be at a ratio of 14g of PAM per kg of soil. Sediment yield and soil loss were best fitted in a quadratic model in the form of a second degree polynomial equation. The relationships between slopes versus the above parameters being used were found to be non-linear. Moreover, the observed soil loss for every level of PAM was best modelled by the following coefficient of determination and their corresponding second degree polynomial equations for both rainfall intensities; at 75 mm/h, A0 : SL = -0.0002s2 + 0.0138s + 0.084; R² = 0.8845 ; A40 : SL = -9E-05s2 + 0.007s + 0.0015 ; R² = 0.7964 ; A80 : SL = -6E-05s2 + 0.0044s - 0.021; R² = 0.8485, and ; at 100 mm/h A0 : SL = -0.0008s2 + 0.0652s - 0.06; R² = 0.9942 ; A40 : SL = -0.0004s2 + 0.0251s + 0.0078; R²=0.9773 A80 : SL= -6E-05s2 + 0.0034s + 0.1223; R² = 0.7536.


 


Keywords


Keywords: soil stabilizer, Polyacrylamide (PAM), rainfall simulator, sediment yield, soil loss.

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International Journal of Humanities and Social Sciences

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