The effects of gypsum on infiltration and surface properties of some western Oregon soils Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zc77ss42n

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  • The effects of broadcast gypsum on infiltration rates, crusting, aggregate stability, and runoff and sediment yields were analyzed during the winter months on three West Oregon soils. The results were used to evaluate its utility as a management tool to help control erosion. An application rate of two metric tons per hectare was used in the first season of testing. No differences were found between treated and untreated soil for infiltration rates, crust thickness and porosity, and aggregate stability. Runoff and sediment yields were too variable to discern differences between treated and untreated soil. The range of application rates were increased to 4, 8, and 16 metric tons of gypsum per hectare in the second season of testing. These evaluations were made at one site. The highest rate was used for comparative purposes with the untreated soil. Infiltration rates were consistently lower while sediment yields and concentrations were higher from the treated soil throughout the season. Water stable aggregate size distribution was lower in the treated soil. It was postulated that crust strength was reduced by the gypsum application. The soil surface aggregates from the treated soil were consistently higher in moisture content. This decreased the infiltration rates and provided a more erodible condition. Runoff and sediment yields from the erosion plots were more dependent on vegetative cover than on treatment.
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