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Yang, Woonho,Kang, Shingu,Park, Jeong-Hwa,Kim, Sukjin,Choi, Jong-Seo,Heu, Sunggi The Korean Society of Crop Science 2018 한국작물학회지 Vol.63 No.2
Improvement in rice grain yield has been approached by means of genetic amendment, cultural management, and environmental adaptation. Subjecting the plant during the grain filling period to an appropriate environment plays a key role in achieving a high grain yield in temperate rice. Field experiments were conducted for two consecutive years with two planting times to assess the relations among grain filling traits, loss of leaf activity during the ripening period, and the grain yield of temperate japonica rice with wide environmental variation. Higher grain yields were attained in 2017 than in 2016 and with late planting than with early planting. The high grain yield accompanied a comparatively lesser increase in grain weight at the early filling stage but more gain in grain weight occurred during the late filling stage. Final grain weight correlated positively with grain filling duration but negatively with grain filling rate. Extended grain filling duration was associated with higher cumulative temperature and cumulative solar radiation for an effective grain filling period. The reduction in SPAD value ${\times}$ leaf dry weight from heading to harvest significantly correlated with final grain dry weight in a positive manner. No significant relation was found between grain filling duration and the decrease in SPAD value ${\times}$ leaf dry weight during the grain filling period. The results suggest that grain filling duration and loss of leaf activity during ripening independently contribute to environmentally induced yield improvement in temperate japonica rice.
Jongseo Choi,Shingu Kang,Sukjin Kim,Jeong Hwa Park,Woonho Yang 한국토양비료학회 2018 한국토양비료학회지 Vol.51 No.4
Hairy vetch (Vicia villosa Roth) is an important green manure crop which decomposes rapidly in soil and releases significant amount of nitrogen to subsequent crops. The incorporation of hairy vetch also contributes to organic matter accumulation and improvement of soil structure. However, appropriate management techniques for soybean production using hairy vetch have not been well studied yet. This study was conducted to investigate the effect of hairy vetch on the soil physico-chemical properties and soybean yield in different soil textures. The experimental soils were classified as clay loam, loam, sandy loam and sand. Hairy vetch was incorporated into soils of different texture at three different rates before sowing of soybean. The amount of incorporated hairy vetch was calculated from the nitrogen content of the biomass which were equivalent to 50, 100, and 150% of the recommended N fertilization rate for soybean, respectively. The growth and yield of soybean in hairy vetch plots were higher than those in conventional plot in clay loam and sand, but they were similar in loam and sandy loam. Soybean yields in clay loam and sand increased along with increase of incorporated hairy vetch biomass. Addition of hairy vetch resulted in increased available P and decreased pH in all soils except loam. Hairy vetch plot showed increased soil water content at 5-10 cm depth in sand, which possibly affects the water availability to plant. In clay loam soil treated with hairy vetch, water content increased at 0-5 cm depth and decreased at 5-10 cm depth compared with conventional plot. This study shows that application of hairy vetch green manure improves soybean yield through the alteration of the soil physical property such as water holding capacity and permeability, especially in very coarse or fine-textured soils.
우리나라 수목원의 방문객 방문형태를 중심으로 유형화에 관한 연구
강신구,심윤진,노지원,성정원,Shingu Kang,Yunjin Shim,Ji Won Noh,Jungwon Sung 국립한국농수산대학교 교육개발센터 2024 현장농업연구지 = Journal of practical agricultural resear Vol.26 No.1
Korean arboretums where a large number of people are visiting could not do visitor's satisfaction in qualitative side and communication through education and event, although a lot of those things statistically have been doing so far. At this side, it needs an arboretum's segmentation: preparing to an adaptation strategy of a new paradigm, differentiated strategy, and problem solving strategy tied by a similar group for the Korean arboretum visitors. This research tries to classify several patterns with Korean arboretums by visitor's behavior and propose each type of subspecialized management plan after analyzing characteristic of supply and demand. The research for this tries to classify several patterns of Korean arboretum and suggest segmentalzed management plan by types after analyzing characteristics of aspects of demand and supply. By looking at the main patterning result of arboretum as a standard of the demand, there were four sorts of arboretums. In the first, it is the arboretum of intermediate type: not a clear characteristic. In the second, it is an arboretum of multipurpose resort type: strongly demanding motivational factors of a rest, health, access, low cost, experience, learning and sightseeing. In the third, it is an arboretum of theme tour type: a strong sightseeing motivational factor and demanding appreciate scenery. In the last, it is an arboretum of studying and admiring type: demanding a motivational factor of sightseeing landscape and plants, a strong experience and learning.
Kim, Sukjin,Choi, Jong-Seo,Kang, Shingu,Park, Jeong-Hwa,Hong, Sunha,Kim, Tae-su,Yang, Woonho 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.6
No-tillage is an effective practice to save labor input and reduce methane emission from the paddy. Effects of tillage and cultivation methods on carbon accumulation and soil properties were investigated in the treatments of tillage-transplanting (T-T), tillage-wet hill seeding (T-WS), minimum tillage-dry seeding (MT-S) and no-tillage dry seeding (NT-S) of rice. Soil carbon was higher in NT-S and MT-S, compared to T-T and T-WS. In NT-S and MT-S, soil carbon contents were the highest in the top soil (5 cm depth) and decreased with soil depth. In T-T and T-WS, however soil carbon contents showed no significant difference up to soil depth of 15 cm from the top. Carbon content was the highest in the soil particle size under $106{\mu}m$ and decreased as the soil particle size increased. Contents of water-stable aggregates in NT-S and MT-S were higher than those of T-T and T-WS. In NT-S and MT-S, contents of water-stable aggregates were the highest in the top soil and significantly decreased with soil depth while no significant difference up to the soil depth of 15 cm in T-T and T-WS. Available $SiO_2$ contents in the top soil were the highest in NT-S and MT-S while the lowest in T-T and T-WS. It is concluded that minimum or no disturbance of soil in rice cultivation can increase carbon accumulation in the soil, especially in the top layer, and subsequently contribute to the formation of the water-stable soil aggregates.
Sukjin Kim,Jong-Seo Choi,Shingu Kang,Jeong-Hwa Park,Sunha Hong,Tae-su Kim,Woonho Yang 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.6
No-tillage is an effective practice to save labor input and reduce methane emission from the paddy. Effects of tillage and cultivation methods on carbon accumulation and soil properties were investigated in the treatments of tillage-transplanting (T-T), tillage-wet hill seeding (T-WS), minimum tillage-dry seeding (MT-S) and no-tillage dry seeding (NT-S) of rice. Soil carbon was higher in NT-S and MT-S, compared to T-T and T-WS. In NT-S and MT-S, soil carbon contents were the highest in the top soil (5 cm depth) and decreased with soil depth. In T-T and T-WS, however soil carbon contents showed no significant difference up to soil depth of 15 cm from the top. Carbon content was the highest in the soil particle size under 106 μm and decreased as the soil particle size increased. Contents of water-stable aggregates in NT-S and MT-S were higher than those of T-T and T-WS. In NT-S and MT-S, contents of water-stable aggregates were the highest in the top soil and significantly decreased with soil depth while no significant difference up to the soil depth of 15 cm in T-T and T-WS. Available SiO2 contents in the top soil were the highest in NT-S and MT-S while the lowest in T-T and T-WS. It is concluded that minimum or no disturbance of soil in rice cultivation can increase carbon accumulation in the soil, especially in the top layer, and subsequently contribute to the formation of the water-stable soil aggregates.
Effects of No-tillage Dry-seeding on Rice Growth and Soil Hardness
Choi, Jong-Seo,Kim, Sook-Jin,Park, Jeong Hwa,Kang, Shingu,Park, Ki-Do,Yang, Woonho 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.6
No-tillage dry-seeding of rice can offer potential benefits by reducing time and labor cost compared with conventional tillage practices. This study was conducted to investigate the effects of no-tillage dry-seeding on rice growth and soil hardness in comparison with other rice cultivation methods, machine transplanting and wet-hill-seeding on puddled paddy. The seedling stand fell within optimum range for both no-till dry-seeding and wet-hill-seeding on puddled paddy. Plant height, number of tillers and SPAD values in no-tillage dry-seeding cultivation were higher than those observed in other methods. There were no significant differences in grain yield of rice among three cultivation methods. The quality characteristics of milled rice grown in no-tillage dry-seeding were similar to those grown in other cultivation methods. Soil hardness in top 10 cm depth was significantly higher in no-tillage dry-seeding than other cultivation methods, while soil hardness below 10 cm depth was highest in machine transplanting cultivation. Results indicate that no-tillage dry-seeding practice is comparable to conventional tillage system in terms of seedling establishment, growth, yield and grain quality.