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Serious problems in reclaimed land agriculture are high soil salinity and poor vertical drainage, so desalinization in these soils is very difficult. Also, although desalinization is accomplished in reclaimed top soils, before long, soils are resalinized according to capillary rise of salts from the subsurface soils. To resolve these problems, multi-layered soil columns with subsurface layer of macroporous medium utilizing coal bottom ash (CBA) were constructed and the effects of blocked resalinization of these soils were investigated. In this experiment soil samples were collected from Munpo series (coarse-loamy, nonacid, mixed, mesic, typic Fluvaquents). The soil texture was silt loam and the EC was 33.9 dS m

This study was conducted to survey vegetation changes and soil characteristics in Saemangeum new reclaimed tidal land. Soil salinity in border area to tidal land was 22.3 dS m -1 but showed 1.1～3.44 dS m -1 over the distance of 2 km from border line. The vascular plants in survey sites were recorded as total 26 taxa in 6 families. The frequency of species appearance of Aster tripolium, A. subulatus var. sandwicensis were highest by 61.5 and that of Phragmites communis, Puccinellia nipponica were 53.8. The almost vegetations occurred in the patch which range of soil salinity 14 dS m -1 were halophytes as Salicornia europaea, Suaeda asparagoides, S. japonica. As lowed soil salinity as 6.7 dS m -1 , mixed vegetation of halophytes with P. communis, P. nipponica, Carex pumila were occurred. Dominant species in the range of 3.0 dS m -1 area were A. subulatus var. sandwicensis, P. communis, Echinochloa spp., Zoysia sinica and Conyza canadensis. Biomass production was the highest in the area of dominant vegetation with P. communis, and mixed zone with P. communis and Aeschynomene indica are followed. The correlation between vegetation biomass and soil salinity, soil pH and dominance index of vegetation were negative.But that of vegetation biomass and soil organic content were positive.

The short petiole trait is valuable for the development of plant ideotype with high yield. Soybean breeding line, SS98206SP, showed extremely short petioles in greenhouse and field. In this study, the short petiole of two mutant lines, SS98206SP and D76-1609, were investigated to determine the genetic segregations. These two mutants were crossed with each other and with two normal petiole genotypes. Genetic analysis indicated that the short petioles in D76-1609 and SS98206SP were controlled by a single recessive gene, respectively. The short petiole gene in SS98206SP was non-allelic with lps, conferring short petiole in D76-1609. Two recessive genes showed complementary relationship having short petioles with recessive homozygote lps1lps1lps?lps?). Our data indicated that the short petioles in SS98206SP were controlled by a single recessive gene designated as lps3.