Effect of Soil Water Potential on Methane and Nitrous Oxide Emissions in Upland Soil during Red Pepper Cultivation

다국어 초록 (Multilingual Abstract)

Under intensive vegetable production, increasedproductivity is primarily considered for selecting better watermanagement and irrigation intensity in upland soils. Soil waterpotential at −30 kPa (field capacity) for red pepper (Capsicumannum L.) production, which is the optimum moisture potentialfor plants, is recommended for Korean upland soils to maximizefruit yield; however its impact on greenhouse gas (GHG)emissions have not yet been considered. In this study, red pepperwas cultivated under two soil water potentials at −30 and −50 kPaby drip irrigation control in two different textured soils (clay andsandy loams). Nitrous oxide (N2O) and methane (CH4) emissionswere simultaneously investigated during the cultivation period.
Results indicated N2O was the main GHG and contributed toapproximate 97–9% of the total global warming potential (GWP),though the extent of its contribution varied depending on soiltexture and soil moisture control with emitted CH4 being negligiblethroughout the investigation period. Between the treatments, soilmoisture control at −50 kPa was effective in reducing the emissionsof the two GHGs and also increased red pepper productivity inboth clay loam and sandy loam soils. Comparing the gross GWPper unit pepper fruit yield between the treatments, maintaining soilwater potential at −50 kPa by controlled irrigation led to a 50%reduction of GWP per unit pepper fruit yield. Therefore, dripirrigation control to lower soil water potential at −50 than −30 kPais recommended to obtain high crop yield and reduce GWP perunit red pepper fruit yield for red pepper production in Korea.

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