The Saemangeum reclaimed land has many exposed areas due to the lack of vegetation, and then fugitive dust may be generated by strong winds. To reduce such fugitive dust, barley and reed were tested by various soil management practices (sowing time, irrigation water salt concentration, fertilizer type, fertilizer application method). Summarizing the results are as follows; Wind speeds in the Saemangeum Gwanghwal area in Gimje tend to increase in January -April, decrease in May -August, and slightly increase again in September -December. In particular, strong winds in this area concentrated on March -April. Therefor, it is important to cover the soil surface in March -April. In the first period (April.24 -May.6, 2020) of collecting fugitive dust according to the salt concentration of irrigation water during barley cultivation, 0 dS m -1 and 3 dS m -1 treatment were statistically significant than 6 dS m -1 treatments. However, there was statistically no significant in the 2 nd periods (May.12 -June.28, 2020) and 3 rd periods (June.28 -July.17, 2020) due to the weak wind speed. The effect of reducing fugitive dust by sowing period of barley was statistically significant in the first periods (April.24 -June.6) compared to June and August when the sowing in February, April, October, and December. The 2 nd periods (April.12 -June.28) and 3 rd periods (June.28 -July.17) were also statistically significant compared to the sowing in June and August. And, crop growth by fertilizer type, ammonium sulfate fertilizer treatments (ammonium sulfate, fused super phosphate, potassium sulfate) with sulfate root was better than that of urea treatment (urea, fused phosphate, potassium chloride), even if there was no statistical significance. Between the fertilizer treatment methods in the second periods, soil/soil (basal dressing/top dressing) and soil/foliar had statistically significant compared to foliar/foliar. The effect of reducing fugitive dust between fertilizer types and treating fertilizer methods in reeds was statistically not significant.
Given continuous needs for a public duty of agriculture and rural area, an effort to improve nutrient management in agricultural sector is strongly required. As a measure to solve these problems, Korean government (MAFRA) introduced the promotion policy called as "Agro-Environment Conservation Program (AECP)" in 2018 and has expanded 5 projet sites in 2019 from 3 in 2018. The program has a variety of agricultural activity to conserve soil, water, air, ecology and landscape. Of those, the nutrient input activity which is one of sub-activities is closely involved in not only crop productivity but also water quality and air pollution. Therefore, in order to lead a soft landing of AECP, it is essential to evaluate the conservation effects in a scientific point of view. In this respect, we focused on evaluating the effect of recommended nutrient input activities, standard fertilization and soil test fertilization, on rice productivity and nitrogen balance. The effect of nutrient management which is explained by rice yield and nitrogen balance was estimated with the combination of soil characteristics and rice varieties. Rice yield by recommended fertilization was 654 kg per 10a, 6% lower than control, but there was no statistical significance. By contrast, nitrogen balance was 4.7 kg lower, which means great improvement, in the recommended than the control. Conclusively, the recommended fertilization like soil test fertilization is expected to be useful as a measure to reduce nutrient balance, to ensure crop productivity, and finally to perform a public role of agriculture.
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