The object of this study conducted to investigate the effect of paddy-upland rotation cropping system on soil properties and crop productivity in newly reclaimed tidal land. Five types of paddyupland rotation cropping system were evaluated : Rice-Rice (RR) Rice-Maize (RM), Mize-Maize (MM), Rice-Soybean (RS), Soybean-Soybean (SS). The soil bulk density was the lowest RM treatment, and soil pH was a tendency to be lower in all treatments of the paddy-upland rotation cropping system. RM treatment showed a higher moisture content and lower Electrical conductivity than RR treatment. Results of maize productivity in paddy-upland rotation cropping system, Except for the stem diameter growth, RM treatment showed good growth and productivity than MM treatment. Soybean growth and yield increased in the rotated upland cultivation from rice-paddy field compared to the SS treatment. But, overall treatments indicated poor growth and yield. In this study, we offer the effects of paddyupland rotation cropping system on the soil properties and upland crop growth and yield, and also out results can be provide supporting basic data that introduced paddy-upland rotation in reclaimed tidal land.

Soil salinity is the most critical problem at reclaimed tidal saline soil in Korea. The objective of this study was carried out investigate the salt movement in upland soils at Gyehwa-do region in Saemangeum reclaimed land on the south Korea coasts. The experiment was conducted 5% sloped polt (3.0 m × 10.0 m) with 14 treatments and it were separated by low salinity division (LSD) and high salinity division (HSD) install. The cation content in ground water increased during time course, but in the case of land surface water the content was variable, and K+was lower than that of Na and Mg. At the LSD under rainproof condition, the salinity was directly proportional to soil water content, but at the HSD the tendency was no reversed. In condition of rainproof, the amount of soil salinity was higher at the HSD than at the LSD. Positive correlation was obtained between the soil water content and available phosphorous content at the rainfall division, but there was no significance at the surface soil of the rainproof division. Sodium adsorption ratio (SAR) and anion (Cl−, SO4 −) contents in soil were repressed in the order of vinyl-mulching > Rice straw-mulching > control plot. Our results indicate that soluble salt control is critical at reclaimed tidal saline soil and the results can provide some useful information for deciding management plans to reduce salt damage for stable crop production and diverse utilization or cultivation could be one of the management options to alleviate salt damages at reclaimed tidal saline soil in Korea.

Paddy-upland rotation system is one of the important cropping system for improving soil quality and crop productivity. we conducted to investigate the effect of paddy-upland rotation system on soil properties and crop productivity in reclaimed tidal land. The paddy-upland rotation could be effective to conserve soil water contents and prevent from salt damage when cultivating upland crops. The first two years of maize cultivation after rice cultivation could be effective to secure stable production. However, in case of soybean crop, the rotation effect might be lower than that of maize. In the first year, the yield of soybean was 214 kg/10a. In the second and third year, the yields of soybean decreased consecutively to 152, 123 kg/10a respectively. In this paper, it would be suggested that maize be cultivated for up to two years and soybean be cultivated for one year after rice crop grown in reclaimed tidal land. This study could be provide basic data of the physico-chemical properties applicable to paddy-upland rotation system at reclaimed tidal lands.

This study was conducted to evaluate the effect of organic inputs on soil properties in a newly reclaimed organic soils. The soil of the experiment site was very low in soil fertility and the physico-chemical properties were poor. Several organic input treatments with different source of nutrient were placed, including compost in combination with green manures for organic agricultural practices, chemical fertilizers for conventional agricultural practices, and control without fertilizer. The experiment was conducted with continuous cropping system during 3 years. The chemical properties concentration in compost+green manure treatment was increased continually compare to control and chemical fertilizer treatment, and closed to the recommended rate of fertilizer. The organic matter value for compost+ green manure treatment was increased from 0.86~0.96% to 2.00~2.29% by continuous nutrient supply of compost and green manure. However, further investigation on increasing of organic matter value for 3 years is necessary to monitor carefully during the long-term because it will help to clarify the all mechanisms of organic matter on organic input application way. The available phosphate value for compost+ green manure treatment was generally increased from 21.9~27.1 mg/kg to 182.0~ 394.1 mg/kg. In case of exchange cation, the concentration for compost+ green manure treatment was increased during 2 years within the range to the recommended rate of fertilizer, however, it is expected to cause a rather over supply for 3 years.

1. 주요 염기영양소인 B, Zn 및 Mg의 복합시용에 의하여 건경중을 증가시켰고 특히 B 및 Mg 시용은 상단부위의 건경중을 증가시키는데 효과적이었다. 2. 건경중 및 삭수는 종실중 증가에 크게 기여하였고 특히 건경중은 하·중단부위의 종실중과 주당 삭수에 영향한 바 있고 하단 및 상단부위의 삭수는 종실중과 밀접한 상호관계를 가졌다. 3. B+Mg의 복합시용은 주당삭수증가에 효과적이었다. 4. 염기영양소의 시용효과는 무처리에 비하여 Mg+B가 21%, B+Zn+Mg가 17%, B단용이 12% 순으로 종실중증가를 가져왔다.