Solarization Effects on Key Soil Fertility Indicators Under Kudzu (Pueraria montana) Invasion.

Solarization is an effective method for managing small areas with kudzu (Pueraria montana) invasions and may also enhance soil quality. This study compared soil pH, C, N, P, and K levels under thermally-treated and non-treated plots invaded by Kudzu. It was conducted from 2005 to 2007 in the Clemson University Experimental Forest in Clemson, South Carolina on a Cecil clay loam (fine, kaolinitic, thermic Typic Kanhapludult). Thermal treatments using translucent polyethylene sheeting and sampling soil depth intervals were arranged in 15 treatments in a randomized complete block design with depths included as a split plot. A model was developed for the factorial treatment design, and ANOVA was used to determine if there were significant main effects or interactions between the two factors. Fischer’s LSD test was used to determine if there were significant differences among specific pairs of means. Kudzu had significantly higher levels of N, P, and K in above ground tissue matter compared to roots. Plots currently invaded by Kudzu and thermally treated plots had significant increases in pH, N, P, and K compared to bare soil at all sampling depths. Results show that Kudzu invasion had significant effects on soil chemical properties by nutrient uplift. Solarization released these nutrients from decomposing plant tissue.