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2. Fine-Root Distribution and Soil Physicochemical Property Variations in Four Contrasting Urban Land-Use Types in South Korea

Author

Tran, Lan Thi Ngoc, primary, An, Ji Young, additional, Carayugan, Mark Bryan, additional, Hernandez, Jonathan O., additional, Rahman, SK Abidur, additional, Youn, Woo Bin, additional, Carvalho, Julia Inacio, additional, Jo, Min Seon, additional, Han, Si Ho, additional, Nguyen, Hai-Hoa, additional, and Park, Byung Bae, additional

Published
2024
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6. Fine root distribution and soil physicochemical properties variations in four contrasting urban land use types in South Korea

Author

Tran, Lan Thi Ngoc, primary, An, Ji Young, additional, Carayugan, Mark Bryan, additional, Hernandez, Jonathan O., additional, Rahman, SK Abidur, additional, Yoon, Woo Bin, additional, Jo, Min Seon, additional, Carvalho, Julia Inacio, additional, Han, Si Ho, additional, Nguyen, Hai-Hoa, additional, and Park, Byung Bae, additional

Published
2023
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17. Change In Soil Properties And Plant Growth At Reclaimed Land Due To Application Of Torrefied Wood Chip And Vermicompost

Author

Han, Si Ho

Abstract

Soil salinity change in reclaimed land is one of major constraints for food production. However, soil properties in this land can vary by time as attempts for desalinization process accelerate. There are several soil-amendment methods to remediate reclaimed land. A field study was conducted for three years at Saemangeum reclaimed land to investigate effects of certain organic amendments to its soil. Three levels (0, 2.5 and 5.0 Mg ha-1) of torrefied wood chip (TWC), and two levels (0 and 2.7 Mg ha-1) of vermicompost (VC) were applied in split-plot design (n=3). Populus euramericana was used as crop tree. To observe soil properties, soil samples were collected twice at 2016 and 2017 in three depths (0~15, 15~30 and 30~45 cm), and analyzed its properties. We measured growth parameters of poplar, and biomass and nutrient analysis of weed to know the nutrient uptake across treatments. TWC, VC and soil depths did not show interaction for all soil elements. Similarly, TWC and VC did not have interaction on all soil properties, poplar growth, and weed nutrient uptake. However, higher TWC application showed removal of Na+, especially at 0~15 cm soil depth. For tree growth, VC showed significant positive response to height and diameter. VC application significantly affected on weed biomass and nutrient uptake of weeds too. These results suggested that TWC could be used in higher application rate to leach out Na+ concentration in salt-affected soil, whereas VC can be applied as an organic fertilizer to reclaimed soil.

Published
2017

18. Effects Of Organic And Inorganic Fertilizer In Different Methods On Growth And Nutrient Responses Of Three Economic Tree Species In South Korea

Author

Han, Si Ho

Abstract

Applications of fertilizer are needed to improve soil fertility and to increase crop yields in the short term. The effects of organic composts vs. inorganic fertilizer amounts on plant responses have been widely observed, but application of these fertilizers in different positions in soil has rarely tested in forestry sector. We used 767 g/pot vermicompost (VC) and 84 g/pot solid compound fertilizer (SCF) with three economic tree species: Betula platyphylla, Chamaecyparis obtusa, and Larix kaempferi in our study. Seven fertilization methods were applied in greenhouse at Chungnam National University, Republic of Korea as follows: no fertilization as control, VC surface fertilization (VCs), VC circular fertilization (VCc), mixed VC with soil (VCm), bottom application VC (VCb), surface application of SCF at 4-spots (SCFs), and bottom application of SCF (SCFb) with 9 replications. Results showed significant effects of treatments on each species. Most of results showed the highest growth of B. platyphylla, C. obtusa in the SCFs treatment. RCD and height growth of L. kaempferi were affected by both VCc and SCFs. VC treatments can improve belowground biomass for all three species. Meanwhile, aboveground biomass was shown the highest with treatment of SCFs. Quality index followed the same trend with RCD and height growth. Generally, VCc in L. kaempferi and SCFs in the other species with the longest vectors identified the most responsive treatments. Our results suggested that SCFs is the best for those three economic species and VCc could be good for L. kaempferi.

Published
2017

31. Biochar effects on the seedling quality of Quercus serrataand Prunus sargentiiin a containerized production system

Author

Aung, Aung, Han, Si Ho, Youn, Woo Bin, Meng, Loth, Cho, Min Seok, and Park, Byung Bae

Abstract

AbstractBiochars are used to improve soil quality and crop productivity as well as to increase carbon sequestration in soil. However, it is important to identify the characteristics of biochar prior to its application because of the positive and negative effects on soil and crop productivity. The purpose of this study was to investigate the effects of charcoals on the growth and seedling quality of Quercus serrataand Prunus sargentiiin a containerized seedling production system. Two of the charcoals used in our research were from oak tree; one produced at 1200 °C and the other at 700 ∼ 800 °C, and a bamboo charcoal produced at about 800 °C. Three charcoals were mixed with artificial soil (peat moss, perlite, and vermiculite with a ratio of 1:1:1 (v/v/v)), and applied commercial fertilizer at two concentrations; 0.5 and 1.0 g L−1. Growth parameters, such as height, root collar diameter, and dry weight, were decreased in charcoal treatments compared to control. However, charcoal treatments significantly increased the quality index of seedlings by 8.3% in Q. serrataand by 19.9% in P. sargentii. Our results suggested that charcoal can be applied to improve seedling quality in the containerized Q. serrataand P. sargentiiseedling production system.

Published
2018
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33. Torrefied wood effects on the seedling quality of Zelkova serrataand Fraxinus rhynchophyllain a containerized production system

Author

Han, Si Ho, Meng, Loth, Rahman, Afroja, Ko, Youngtak, Cho, Min Seok, and Park, Byung Bae

Abstract

ABSTRACTBiochar can be used as a kind of soil amendment in crop production, but there are few studies on containerized seedling production in forestry. The purpose of this study was to investigate the amount of torrefied wood to mix with growing medium for Zelkova serrataand Fraxinus rhynchophyllaseedling production in a containerized system. We used torrefied wood made from chips of Quercus accutissima, which was mixed with growing medium by 0%, 10%, 20%, 30%, and 40% in volume. We applied two levels of 0.5 g/L (1×) and 1.0 g/L (2×) commercial fertilizer for fertilization treatment. Generally, growth parameters such as height, root collar diameter, and dry weight were comparable among 0%, 10%, and 20% mixed ratios, but those at 30% and 40% mixed ratio were lower than other mixed ratios. The 2× fertilization significantly increased height by 29%, root collar diameter by 18%, total dry weight by 52%, and quality index by 31.4% compared to the 1× fertilization across mixed ratios. Our results suggest that torrefied wood can be substitutable for 20% of the growth medium in total volume in containerized Zelkova serrataand Fraxinus rhynchophyllaseedling production systems.

Published
2017
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34. The effects of biochars on the growth of Zelkova serrataseedlings in a containerized seedling production system

Author

Cho, Min Seok, Meng, Loth, Song, Ji-Hye, Han, Si Ho, Bae, Kikang, and Park, Byung Bae

Abstract

ABSTRACTBiochar has been used for soil improvement in agriculture; however, there are few studies of its uses in forestry. The purpose of this study was to investigate the effects of biochar, made from diverse feedstocks on the growth and chlorophyll content of Zelkova serrataseedlings, to identify optimal feedstocks in a containerized seedling production. Five resources were used for biochar: woodchips of Pinus densifloraand Quercus acutissima; cones of Pinus koraiensis; rice husks; and crab shells. The biochar was mixed with growing medium by 20% in volume and two levels of fertilization were applied. The height and root collar diameter of Z. serratatreated with wood chips of P. densifloraand Q. acutissimaand rice husk were each significantly greater than those treated with pine cones and crab shells. The biomass responses and quality indexes were similar to those of height and root collar diameter. There were no significant differences in growth between fertilization levels. This study shows that biochar made from woodchips of P. densifloraand Q. acutissimaand rice husk can be substituted for growing medium by 20% in a containerized seedling production system.

Published
2017
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