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Effect of Spatial Soil Salinity Variation on the Growth of Soiling and Forage Crops Seeded at the Newly Reclaimed Tidal Lands in Korea  

Sohn, Yong-Man (Rural Research Institute. KARICO)
Jeon, Geon-Yeong (Rural Research Institute. KARICO)
Song, Jae-Do (Rural Research Institute. KARICO)
Lee, Jae-Hwang (Rural Research Institute. KARICO)
Park, Moo-Eon (Rural Research Institute. KARICO)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.42, no.3, 2009 , pp. 179-186 More about this Journal
Abstract
Relation between soil salinity and forage yield of five upland crops such as sudan grass, sesbania, barnyard grass, corn and soybean was studied in the three reclaimed lands of Korea during two years from 2007 to 2008. Although plant number emerged was obtained satisfactory by desalting treatment, further growth of crops was sharply affected by re-salting process according to soil drying. Soil salinity varied place by place and changed constantly, crop growth was differently responded to soil salinity according to the specific conditions of the reclaimed lands. In the Iweon reclaimed land with higher soil water conductivity and sandy soil texture, crop growth and yield sharply decrease with increase of soil salinity. Relation between soil salinity and crop growth and yield was well expressed as logarithmic function. Surface soil EC to reach at 50% of growth reduction to the tallest height of crops was $5dS\;m^{-1}$ for soybean, $6dS\;m^{-1}$ for corn and $7dS\;m^{-1}$ for sudan grass, sesbania, and barnyard grass by logarithmic function. In the Hwaong and Yeongsangang reclaimed lands with low soil conductivity and finer soil texture, plant growth response to salt stress was statistically vague by mixing of harmful influence from flooding and wet injury. However, it is observed that crop growth and yield on the place of lower salinity was better than crop growth on the place of higher salinity. It is accordingly concluded that flooding control during summer rainy season is vary important as well as desalting process for good growth of soiling and forage crops in the newly reclaimed land from tidal flat.
Keywords
Reclaimed tidal land; Soil salinity; Spatial variation; Forage crop;
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