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Polymers for Erosion Control in Furrow Irrigation
Ray
Wardenaar Test the effectiveness of water-soluble polyacrylamide, when added to irrigation water at 10 ppm, in controlling erosion in furrow irrigated fields. Location: Othello,
WA Check - no polymer The field was relatively level on the upper end and then sloped to the bottom at 7-10% slope. Plots were 8 rows wide and ran the length of the field (approx. 900'). Sediment was measured hourly using Imhoff cones, from morning when water was turned on until about 4 pm. The experiment began after the last cultivation and ran for seven consecutive irrigations. Measurements in each plot were taken from one furrow that had a wheel track, and one that did not. Data
Conclusion Overall, the polymer was very effective in reducing soil erosion. The polymer also increased water infiltration and slowed advance times compared to untreated furrows. This could lead to greater water conservation. Also, there could possibly be a grain yield benefit from the polymer, due to improved soil wetting patterns even though no yield increase was indicated in this test. Both the cooperating farmer and fertilizer dealers were able to mix the polymer and handle the application logistics. Based on the results, the polymer might be used 3-4 times per season at a cost of $4-$5 per application. The cooperating farmer felt that the polymer would pay for itself just by reducing the frequency and cost of cleaning out sediment ponds now in use. |
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