Managing Soil Organic Matter and Salinity by Crop Cultivation in Saemangeum Reclaimed Tidal Land

다국어 초록 (Multilingual Abstract)

This study was to evaluate the effect of organic amendments incorporation on soil properties and plant growthunder two different soil salinity levels and various cultivated crops at Saemangeum reclaimed tidal land forthree years from 2012 to 2014. The soil texture of the experimental site was sandy loam. Four different crops,sesbania (Sesbania grandiflora), sorghum-sudangrass hybrid (Sorghum bicolor-Sorghum sudanense), rice(Oryza sativa L.) and barley (Hordeum vulgare) were cultivated at low (< 1 dS m-1) and high (> 4 dS m-1) soilsalinity levels. The soil salinity was significantly lowered at the rice cultivation site compared to continuousupland crops cultivation site in high soil salinity level. But the soil salinity was increased as cultivatingsesbania coutinuously in low soil salinity level. The soil organic matter content was increased with theincorporation of straw at the continuous site of rice and barley, and the average of soil organic matter wasincreased by 0.9 g kg-1 per year which was effective in soil aggregate formation. The highest biomass yieldplot was found in barley (high salinity level) and sesbania (low salinity level) cultivation site, respectively.
Our research indicates that rice cultivation in paddy field with high salinity level was effective in lowering soilsalinity and sesbania cultivation was useful to biomass production at upland with low salinity. In conclusion,soil salinity and organic matter content should be considered for multiple land use in newly reclaimed tidalland.

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