In case of plastic film greenhouses cultivating fresh vegetables on paddy soil, soil characteristics must be considered as more important factor than any other factors. Generally after the four years of cultivation, soils tend to increase electrical conductivity value, nutrient unbalance and soil pests. As a result, degradation of agricultural products occurred, therefore it is necessary to improve soil conditions. In this study, yield and economic cost of cucumber were analyzed. The best soil conditions for cucumber cultivation were alluvial or valley in soil topology, moderately or poorly drainage in soil drainage classes, coarse loamy soil in texture. In addition, rich -sunlight and -deep groundwater would be proper for the cucumber cultivation. Good environmental managements of plastic film greenhouse were as follows. The temperature needed to be adjusted three times. The optimal daytime temperature could be 22∼28℃, the one from 12 until night could be 14∼15℃ , and the temperature from 24 to sunrise could be 10∼12℃. During plant growth period, soil moisture content was as low as 10∼15%, and it needed to be maintained as 15∼20% during reproductive growth period. To control pests, catch crop cultivation and solar treatment were carried out, after those EC was reduced and the root-knot nematode was controled too. Cucumber yield from the plot with improved soil managements increased to 158.4 Mg ha
The soil which was confirmed by using auger with intervals of 200 m at a depth of 1 m in Agricultural tide land Section 5 had a somewhat poorly drainage and coarse loamy. The Gwangpo series has coarse loamy texture with a somewhat poorly drainage in Fluvio-marine plains, but confirmed soil had different characteristics with the Gwangpo series Our objective of in this study was to set a new soil series by comparing to the Gwangpo series. Both the Gwangpo and A-Gwangpo serieses showed the similar horizons (A, B and C horizons), texture (coarse loamy), and chemical properties. A somewhat poorly drainage in general Gwangpo series caused mainly grayish color and 2 -20% of the mottle's distribution (by oxidation) within 20 -50 cm depth. An our soils, the mottle's distribution was investigated by 2 -20% and 20 -49% in the Gwangpo and A-Gwangpo series, respectively. Gwangpo series is somewhat poorly drained and has a small amount of mottle (by oxidation) quantity, so it is used as a paddy field. But the A-Gwangpo series is estimated that it can be used as a field soil with an amount of 20 -49% of mottle (by oxidation) quantity.
Agricultural lands have decreased continuously because of urbanization, land consolidation, road construction, etc. Especially, rapidly urbanizing areas such as Cheongju-si in South Korea has the severe land-use change.In this regard, Our study was aimed investigating land-use changes including soil properties and soil information to provide the basic soil information and soil management practices in the region. The area of crop cultivated land of South Korea in 2016 reduced by 35,424 ha compared to that of 2014. The paddy and upland field decreased by 12,455 and 22,969 ha respectively. The reasons for the decrease of the paddy field are as follows: converting the paddy field to upland (22,780 ha) > others (3,646) > public facilities (2,740) > building (2,642) > idle land (1,439). The reasons for the increase of the upland filed are as follows: switching paddy to upland (22,780 ha) > others(5,330) > reclamation of upland (1,415). The main reason converting paddy field to upland was cultivating more profitable upland crops or fruit trees. The arable land in Chungju-si had been reduced by 1,087 ha in 2014 since 1999. The ratio of the reduced arable land was about 48%. Our results showed that paddy fields located in alluvial plains were changed into upland or green house. In particular, paddy fields have been changed to not only upland, orchard, greenhouse cultivation but also fallow land. Moreover, our research using 3686 soil codes (soil phases) and 3834.2 ha indicated that the number of soil series and soil phase increased to 74 and 160 from 65 and 126 individually. The largest increased area was Sachon (coarse loamy fluvaquentic endoaquepts) soil series 536.3 ha which were modified from the existing Yecheon, Sanju, Wolgog, and Seongsan soil series.
Agricultural lands have decreased continuously because of urbanization, land consolidation, road construction, etc. Especially, rapid urbanizing areas such as Gimpo-city in South Korea has the severe land-use change. In this regard, aim of our study was to investigate land-use changes including soil properties and soil information to provide the basic soil information and soil management practices in the region. The arable land in Gimpo-city had been reduced by 47,121 ha in 2017 since 1999. The ratio of the reduced arable land was about 22.1%. Our results showed that paddy fields located in alluvial plains were changed into upland or green house. In particular, paddy fields have been changed to not only upland, orchard, greenhouse cultivation but also fallow land. Moreover, our research using 462 soil codes (soil phases) and 1207.3 ha indicated that the number of soil series and soil phase increased to 47 and 79 from 43 and 74 individually. The largest increased area was Mangyeong (coarse silty, mixed, mesic family of Fluvaquentic Endoaquepts) soil series 418.3 ha which were modified from the existing Jeongbug and Chunpo soil series.
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