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RISS 인기검색어
- 검색키워드
- 저자 : Mengmeng Gu (검색결과 7 건)
- 무료
- 기관 내 무료
- 유료
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Growth and Fruit Production of Asian Pear Trees Grown on Y-, T-, and Vase-training Systems
최장전,Mengmeng Gu,최진호,한점화,임선희,김윤경,정석규,최현석 한국원예학회 2014 Horticulture, Environment, and Biotechnology Vol.55 No.1
This study was carried out to evaluate the effects of training systems on growth and fruit production of‘Niitaka’ pear (Pyrus pyrifolia L.) trees in the first 8 years in South Korea. The training systems included Y-trellis(YT), T-trellis (TT), and vase-pergola with either two (VP I) or three main branches (VP II). Tree spacing for YT,TT, VP I, and VP II were 6.5 m between tree rows, and 3.0, 6.0, 3.0, and 6.5 m between trees, respectively. TheTT trees had lower tree height, canopy area, and number of new shoots, average length of new shoots, and trunkcross sectional area as compared to those in other training systems in year 3 or year 8. The TT and VP II systemswere slow to fill the allotted space from year 3 to 8. The VP I trees had comparatively rapid development of thetree canopy, high cumulative yield efficiency per tree, high cumulative fruit yield per area, and large fruit size, aswell as low operation hours for orchard management. Fruit quality parameters, such as fruit shape, soluble solidscontent, firmness, and titratable acidity, were not consistently affected by training system in years 5 and 8.
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Ruixian Liu,Mengmeng Gu,Lan Huang,Fei Yu,Seok-Kyu Jung,최현석 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.3
The purpose of this study was to evaluate the biochar from fast pyrolysis of pine wood mixed with manure compost or vermicompostas a potential container substrate to replace peat moss. Seven biochar substrates were compared to the control(a commercial substrate; 0B) in container cultivation of bell pepper ( Capsicum annuum L.): 100% biochar (100B), 90%biochar + 10% manure compost (90B10C; by volume), 80% biochar + 20% manure compost (80B20C), 70% biochar + 30%manure compost (70B30C), 90% biochar + 10% vermicompost (90B10V), 80% biochar + 20% vermicompost (80B20V),and 70% biochar + 30% vermicompost (70B30V). The physical characteristics of the container substrate (total porosity,container capacity, air space, and bulk density) were tested using NCSU porometers. The electrical conductivity (EC) andpH of container substrate leachates were measured according to the pour-through method on 34, 41, 62, and 83 days afterplanting (DAP). Growth index was measured on 34, 41, 48, 55, 62, 69, 76, and 83 DAP. Leaf SPAD value, net photosynthesisrate, total leaf area, and stem diameter were measured at week 11. Dry weight and yield were measured at the fl owering (72DAP) and harvesting (113 DAP) stages. The control showed the highest container capacity (59.2%) and the lowest air space(14.1%), with the opposite results observed on 100B. Control had pH values within 6.0–7.0 for optimum pepper growth,while container substrates with biochar resulted in a pH less than 6.0 from 41 to 83 DAP. EC in control at 34 DAP wasapproximately four times greater than values observed on the other substrates. EC of 70B30V slightly increased between 34and 41 DAP, and the lowest EC was observed on 100B. SPAD value and net photosynthesis rate were the greatest on plantsgrown in control. The total leaf area, stem diameter, growth index, vegetative (stem + leaf) and fl ower dry weights, and yieldwere the highest in control, followed by 70B30V, 80B20V, and 90B10V, with the lowest in 100B.
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Course of fruit cracking in ‘Whansan’ pears
최진호,이별하나,Mengmeng Gu,이욱용,김명수,Seok-Kyu Jung,최현석 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.1
This study was evaluated on time of occurrence and tissue characteristics in fruit cracking of mid-season cultivar Whansan Asian pears (Pyrus pyrifolia Nakai) with high amount of precipitation from 60 to 120 days after full bloom (DAFB). Fruit cracking was observed at different topographic ‘Whansan’ pear orchards as a pre-experiment. Pear trees at mountainous orchards received low amount of precipitation in June, between 50 and 80 DAFB, and had a high defoliation and low average of fruit weight and fruit cracking (2.5%) compared to those of pears grown at plain and middle-mountainous orchards. In a main experiment, cracked fruit contained lower concentrations of Ca and higher water soluble pectin in flesh or peel than those of values observed on the intact fruit. Fruit diameter rapidly increased at 40 DAFB and mostly 70–80 DAFB under repeated fluctuation of soil water potential between − 28 and − 67 kPa. Fruit were early completed their cell division and converted into cell enlargement phase between 30 and 50 DAFB, advancing formation of cork cells, while the number of large stone clusters significantly increased at 50 DAFB. Besides of less Ca uptake, both formation of cork and stone cells reduced cell flexibility in the flesh, causing initiation of internal micro-cracking under repetition of rapid change of soil water potential. Fruit cracking was visually progressed at 75 DAFB when fruit were mostly enlarged.
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Donghui Peng,Mengmeng Gu,Yan Zhao,Fei Yu,Hyun-Sug Choi 한국원예학회 2018 원예과학기술지 Vol.36 No.4
This study investigated the potential of using biochar as a container substrate component to replace peat moss to produce horticultural crops. Biochar was incorporated into commercially available peat moss-based substrate (PM) at 0%, 20%, 40%, 60%, 80% and 100% (vol.) to grow chrysanthemum (Dendranthema grandiflorum), tomato (Solanum lycopersicum), lettuce (Lactuca sativa) and basil (Ocimum basilicum) in containers. Responses of plant growth to the percentage of biochar in substrate mixes was different for the crops. Chrysanthemum grown in PM mixes with 60%, 80% and 100% biochar had significantly higher shoot fresh weight (FW) than in PM alone (0% biochar), while tomato plants in PM mixes with 80% and 100% biochar had lower shoot FW, dry weight (DW), and root rating values. For lettuce, only plants grown in 100% biochar of the second crop (sowed after 52 days of the first crop) had lower FW than those grown in PM mixes without biochar. For basil, the lower root rating was observed in plants grown in PM mixes with 80% biochar, while the highest was observed in plants grown in PM mixes with 20% biochar. Basil grown in PM mixes with 20% biochar had higher dry and fresh weights than those in PM mixes with no biochar. No negative effect on plant growth was observed in mixes with biochar as high as 60%, which was probably due to the similarity between physical properties of biochar and PM tested in this experiment.
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최현석,Yan Zhao,Haijie Dou,Xiaoya Cai,Mengmeng Gu,Fei Yu 한국원예학회 2018 Horticulture, Environment, and Biotechnology Vol.59 No.3
This study investigates the potential of using biochar as a substrate component to replace pine bark (PB) to produce horticultural crops in containers. Biochar was incorporated in PB at 0, 20, 40, 60, 80 and 100% (by volume) to grow chrysanthemum, tomato, lettuce and basil plants in containers. The responses of plant growth to the percentage of biochar combined in PB mixtures varied among the different crops. Chrysanthemum plants grown in PB mixtures with 80% and 100% biochar had significant higher shoot fresh weight (FW) and dry weight (DW) than plants grown in PB alone, while the same treatments resulted in reduced shoot FW, DW, growth index measured at 19 and 33 days after transplanting and root rating of tomato plants. Growing lettuce plants in 100% biochar reduced the FW of the second crop compared to plants grown in PB substrates supplemented with 0, 20, 40, 60, and 80% biochar. For basil, although biochar alone caused lower root rating, it did not adversely influence the fresh basil yield. Generally, no negative effect on plant growth was observed in PB mixes with biochar as high as 60%, which is probably the outcome of similar physical properties of the biochar to the commonly used PB.
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