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- W2000006876 abstract "Anionic polyacrylamide (PAM) can reduce soil erosion. Slope is an important factor determining erosion rate; however, PAM guidelines have not been well developed for different slopes. The objective of this study was to evaluate the extent which 20 kg ha<sup>−1</sup> (18 lb ac<sup>−1</sup>) PAM (20P) and 40 kg ha<sup>−1</sup> (36 lb ac<sup>−1</sup>) PAM (40P) increase the time to initial runoff (TRO), decrease cumulative runoff (RO), and decrease cumulative sediment loss (SL) on a Mexico silt loam soil adjusted to slopes of 10%, 20%, and 40%. Soils were packed to a bulk density of 1.3 Mg m<sup>−3</sup> (81 lb ft<sup>−3</sup>) in test beds 0.3 × 0.3 × 0.15 m (12 × 12 × 6 in) and were subjected to a 61 mm h<sup>−1</sup> (2.4 in hr<sup>−1</sup>) simulated rainfall with a kinetic energy of 1.5 kJ m<sup>−2</sup> h<sup>−1</sup> (103 ft lb ft<sup>−2</sup> hr<sup>−1</sup>) for 1 h. Differences in TRO and SL for all slopes and PAM rates were all highly significant, as were all two-way interactions (<i>p</i> < 0.01). Applications of 20P and 40P significantly increased TRO compared to the untreated control (0P) at slopes 20% and greater but not at a 10% slope. No difference in TRO was found for soils at slopes up to 20% between 20P and 40P. The TRO was significantly greater at 40% slope for the 40P compared to the 20P application. Values of TRO with 20P and 40P were not increased at a 10% slope compared to 0P. Slope was not a factor in reducing RO. Applications of 40P for all slopes had significantly greater RO than either 0P or 20P. Polyacrylamide reduced SL for all slopes. A higher rate of PAM (40P) had less SL than a lower rate of PAM (20P) at slopes of 20% and 40%. With 40P, the reduction in SL was 72% greater than 0P at 40% slope. Therefore, slope is a critical factor in determining a PAM rate for reducing soil erosion and should be considered for proper application." @default.
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- W2000006876 date "2011-05-01" @default.
- W2000006876 modified "2023-09-27" @default.
- W2000006876 title "Polyacrylamide efficacy for reducing soil erosion and runoff as influenced by slope" @default.
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- W2000006876 doi "https://doi.org/10.2489/jswc.66.3.172" @default.
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