To identify the effects of straw mulching on soil physicochemical properties in reclaimed saline soil, field experiment was conducted for 3 years (2010~2012) in Saemangeum reclaimed land. Soil series of the experimental field was Munpo and soil texture was fine sandy loam. The experiment was conducted at a field with EC of 2.4 dS m -1 (field Ⅰ) and the other field with EC of 5.6 dS m -1 (field Ⅱ). Each experimental field was treated with rye straw incorporation, mulching with rye straw and control. In 2010 rye straw produced from other field was used for the experiment and in 2011~2012 rye straw cultivated at the same experimental field was used. After rye straw application, soybean was cultivated. After 3 years field experiment, by rye straw incorporation, soil salinity decreased from 2.4 dS m -1 to 0.6 dS m -1 at fieldⅠ but increased from 5.6 dS m -1 to 7.6 dS m -1 at field Ⅱ. By mulching with rye straw soil salinity decreased from 2.4 dS m -1 to 0.5 dS m -1at field Ⅰ and also decreased from 5.6 dS m -1 to 0.5 dS m -1 at field Ⅱ. By rye straw incorporation and mulching soil organic matter increased from 2 g kg -1 to 4 g kg -1. At field Ⅰ yields of soybean were similar between rye straw incorporation and mulching but at field Ⅱ yield of soybean increased apparently by mulching with rye straw compared to rye straw incorporation and control.

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It is known that the poor soil fertility of newly reclaimed saline soils is due to the lack of organic matter and available mineral nutrients for crop production. The effect of green manuring with Sesbania aculeata in combination with five rates of urea-N treatments (N0. N25, N50, N75, N100) on the productivity of a subsequent whole-crop barley and the fertility of the reclaimed saline soil in Saemangeum was evaluated in the field during 2013-2014 growing season. Sesbania was grown during summer season (June to October). The amount of Sesbania incorporated was 16.2 Mg ha . Apparent N recovery (ANR) of whole-crop barely showed decreased with sesbania plus increasing rates of N fertilizer. Despite higher yield with sesbania manuring plus increasing N rates, the contributions of N from Sesbania with increasing N rates to whole-crop barley were decreased, whereas those from fertilizer increment due to excessively mineralized Nitrogen. Considering yield, ANR, N contribution from Sesbania and nitrogen fertilizer, the optimum N rate was N50 rate following sesbania incorporation.Key words: Green manuring, Sesbania, Seamangeum, NitrogenResponse of whole-crop barley to N fertilizer rates following sesbania incorporation (actual N fertilizer rates to whole-crop barley were N0-N100 : 0, 37.5, 75.0, 112.5, 150 kg ha ).

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