• Title/Summary/Keyword: growth degree days

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Effect of Transportation Conditions and Plant Growth Regulator on the Maintenance of Freshness and Quality of Cut Chrysanthemum 'Baekma' (절화국화 '백마'의 수송조건 및 생장조절제 처리가 선도유지 및 품질에 미치는 효과)

  • Suh, Jeung Keun;Kim, Ji Hee;Kim, Kyoung Ok
    • FLOWER RESEARCH JOURNAL
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    • v.19 no.4
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    • pp.206-211
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    • 2011
  • This study was carried the effect of transportation conditions and plant growth regulator on the maintenance of freshness and quality of cut Chrysanthemum 'Baekma'. The quality of cut chrysanthemum 'Baekma' which were stored at $5^{\circ}C$ was better than those of stored at $20^{\circ}C$ and control. When cut mum 'Baekma' was transported stacking boxes with vertical condition after dipping in distilled water, flowering degree, flower size, days to flower appearing degree, and bent neck were delayed. Flowering degree was delayed by $10mg/L^{-1}$ uniconazole spraying, The days to bent neck was delayed by 1,000x daminozide spraying.

Effect of NaCl on Germination of Artiplex gmelini and Pharagmites communis (갈대 및 가는갯능쟁이의 발아에 미치는 NaCl의 효과)

  • 김관수
    • Journal of Plant Biology
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    • v.28 no.3
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    • pp.253-259
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    • 1985
  • The results of the conducted experiment obtained basic data on seed germination for Phragmites communis and Atriplex gmelini were; Seed germination was not influenced till 0.5% NaCl, but at over 1.0% NaCl it dropped remarkably. The germination limit fro degree of NaCl was 2.0% in Phragmites communis. Atriplex gemelini was 2.5% and in accordance with the increase of the degree of NaCl. Germination speed showed a negative correlation being highly significant and the germination period lengthened. Compared with growing top plants, growth of roots was largely influenced by a high degree of NaCl. In accordance with the rise of temperature, the germination rate, and speed of both plants remarkably increased and the germination period was shortened. Ubride of Atriplex gmelini was germinated at the early days of picking but was not as the passing of the period. The seeds also did not germinated likewise Ubride. By a seedcoat breaking germination became 81%. During 20 min soaking treatment in conc H2SO4 seed germination possibility of 63% was known to be hard. Adequate soaking time in conc H2SO4 was 17.5 min.

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Studies on the Optimum Light Intensity for Growth ot Punux ginseng. (III) Effect of mulching on the growth of ginseng plant under different light Intensity. (인삼생육의 최적광량에 관한 연구 (제3보) 광도가 다른 조건하에서의 송면의 피복이 인삼생육에 미치는 영향)

  • Lee, Jong-Cheol;Cheon, Seong-Gi;Kim, Yo-Tae
    • Journal of Ginseng Research
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    • v.6 no.2
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    • pp.154-161
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    • 1982
  • To determine the effects of mulching with the hulls of rice on the growth of the ginseng plant and changes of its growing environment-soil moisture content. subterranccan temperature and soil hardness- were investigated under different light intensity such as 5%, 10%, 20%, and 30% light transmittance rate(LTR). The results obtained were as follows; 1. Soil moisture content under the shading was decreased as the increase of light intensity, whereas it was increased about 1.5% in each plot of LTR by the mulching. 2. Suberranccan temperature under the shading was increased as the increase of light intensity. It was decreased on a hot day by the mulching but increased on a cold day. 3. Soil hardness was decreased by the mulching. 4. Sprouting date of the ginseng plants was acclerated for 7 days and sprout periods were shortened for f days by mulching compared to the non-mulching treatment. 5. Missing plant rate was increased severely as the increase of light intensity more Than 20% LTR In the non-mulching plots but did not severe in the mulching plots. Missing plant rate was decreased remarkably by the mulching. The degree of decrease was larger as the increase 6f light intensity. 6. Root yield was increased in the mulching plots compared to the non$.$mulching plots. The degree of increase was larger as the increase of light intensity. The highest yield was obtained at 20% LTR with mulching.

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Field Survey of Moisture Injury in Peucedanum japonicum Thunberct and Rehmannia glutinosa Liboschitz (습해지역에서 식방풍과 지황의 생육양상)

  • Park, Sang-Gu;Kang, Dong-Kyoon;Chung, Sang-Hwan;Choi, Boo-Sull
    • Korean Journal of Medicinal Crop Science
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    • v.7 no.3
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    • pp.162-166
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    • 1999
  • In 1998, there was heavy precipitation of 60 days with amount of 1,042mm from June to September in Andong. Upland crop was severely injured by excessive moisture(EM) on poor drainage field. In this trial, effects of EM on the growth characteristics and yield in Peucedanum japonicum Thunberct and Rehmannia glutinosa Liboschitz was investigated. In Peucedanum japonicum Thunberct, growth of root was decreased more severely than that of aerial part by EM injury, and fresh weight of root per ha was decreased by $21{\sim}80%$ at different degree of EM injury compared to that of normal growth. In Rehmannia glutinosa Liboschitz, percent of withered plant was $10{\sim}52%$ at different degree of EM injury. and rhizome's number per plant and diameter was extremely decreased by EM injury. Fresh weight of rhizomes per ha was decreased by $19{\sim}83%$ at different degree of EM injury compared to that of normal growth.

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Improvement of the Biocompatibility of Chitosan Dermal Scaffold by Rigorous Dry Heat Treatment

  • Kim, Chun-Ho;Park, Hyun-Sook;Gin, Yong-Jae;Son, Young-Sook;Lim, Sae-Hwan;Park, Young-Ju;Park, Ki-Sook;Park, Chan-Woong
    • Macromolecular Research
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    • v.12 no.4
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    • pp.367-373
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    • 2004
  • We have developed a rigorous heat treatment method to improve the biocompatibility of chitosan as a tissue-engineered scaffold. The chitosan scaffold was prepared by the controlled freezing and lyophilizing method using dilute acetic acid and then it was heat-treated at 110$^{\circ}C$ in vacuo for 1-3 days. To explore changes in the physicochemical properties of the heat-treated scaffold, we analyzed the degree of deacetylation by colloid titration with poly(vinyl potassium sulfate) and the structural changes were analyzed by scanning electron microscopy, Fourier transform infrared (FT-IR) spectroscopy, wide-angle X-ray diffractometry (WAXD), and lysozyme susceptibility. The degree of deacetylation of chitosan scaffolds decreased significantly from 85 to 30% as the heat treatment time increased. FT-IR spectroscopic and WAXD data indicated the formation of amide bonds between the amino groups of chitosan and acetic acids carbonyl group, and of interchain hydrogen bonding between the carbonyl groups in the C-6 residues of chitosan and the N-acetyl groups. Our rigorous heat treatment method causes the scaffold to become more susceptible to lysozyme treatment. We performed further examinations of the changes in the biocompatibility of the chitosan scaffold after rigorous heat treatment by measuring the initial cell binding capacity and cell growth rate. Human dermal fibroblasts (HDFs) adhere and spread more effectively to the heat-treated chitosan than to the untreated sample. When the cell growth of the HDFs on the film or the scaffold was analyzed by an MTT assay, we found that rigorous heat treatment stimulated cell growth by 1.5∼1.95-fold relative to that of the untreated chitosan. We conclude that the rigorous dry heat treatment process increases the biocompatibility of the chitosan scaffold by decreasing the degree of deacetylation and by increasing cell attachment and growth.

Effects of Seeding Date on Growth and Yield in Oats (파종기가 귀리의 생육 및 수량에 미치는 영향)

  • 현승원;박양문;고무수;강영길
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.39 no.4
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    • pp.359-365
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    • 1994
  • A oat (Avena sativa) cultivar, 'Guiri 16', was seeded on Oct. 9, Oct. 24, Nov. 9, Nov. 24, Dec. 9 of 1991 and 1992 to determine usefulness of growing degree days (GDD) for predicting growth duration and the optimum seeding date of oats for grains in Cheju province. The later the seeding, the greater the number of days to emergence but the fewer the number of days to heading and maturity. As seeding was delayed, accumulated GDD from seeding to emergence generally tended to decrease but was less subjective to a constant downward tend over seeding date than the number of days. Accumulated GDD from emergence ot heading decreased with delaying seeding and accumulated GDD from heading to maturity decreased as seeding was delayed up to Nov. 24. As seeding was delayed from Oct. 9 to Dec. 9, to Dec. 9, leaf area index at heading decreased from 7.7 to 5.1 and dry matter yield at maturity from 1920 to 823 kg /10a in 1992-1993, and culm length 120 to 89cm on an average of 1991-1992 and 1992-1993. While the number of grains per panicle and test weight were not affected by seeding date in 1991-1992 and 1992-1993, the number of panicles per m$^2$ and grain yield were decreased when oats were seeded earlier or later than Nov. 9. 1000 grain weight was not affected by seeding date in 1991-1992 but greatest at Nov. 9 seeding in 1992-1993. The results indicate that optimum seeding date of oats in Cheju province would be early November. November.

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Inhibitory effect of partial Pathogen growth in virtue of Green Tea Extracts in Cold Storage Conditions of Products for Cook-Chill System (Cook-Chill System을 위한 생산품의 냉장저장 중 녹차 추출물의 첨가에 따른 일부 식중독균의 증식저해효과)

  • Kim Heh-Young;Jung Sung-Mi
    • Korean journal of food and cookery science
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    • v.21 no.1 s.85
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    • pp.47-52
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    • 2005
  • This study aimed to determine inhibitory effect of pathogen growth by adding green tea extracts to some cook-chill foods. For this study, chicken meat salad and pyeonyuk were blended with green tea extracts to different concentrations of 0, 2 and $3\%$ and prepared in a cook-chill system. S. typhimurium in chickien meat salad; Better antibacterial effects of green tea extracts were observed at a $3\%$ concentration, compared with a $2\%$ concentration. Populations of S. aureus in chicken meat salad; antibacterial effects at a $3\%$ concentration became significant from 3days while that at a $2\%$ concentration remained steady throughout the five-day duration. All three testing samples exhibited a decrease in populations of S. aureus during storage. In pyeonyuk, S. aureus counts at a $3\%$ concentration were 7.26 CFU/g on day 3 and declined to 6.61 CFU/g and 6.48 CFU/g on the following days, showing a greater degree of decline than that of a $2\%$ concentration.

Application of reproductive allocation index to the analysis of growth and maturation patterns of Sargassum macrocarpum C. Agardh in Jeju Island, Korea (제주연안 큰열매모자반의 생장과 성숙패턴 분석을 위한 생식배분 지수의 적용)

  • Ko, Shin Ja;Kim, Yoo Kyung;Hong, Seong Wan;Kang, Min Su;Hwang, Eun Kyoung;Lee, Young Don
    • Korean Journal of Environmental Biology
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    • v.37 no.4
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    • pp.672-681
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    • 2019
  • The ecological characteristics of Sargassum macrocarpum, an ecologically and commercially valuable brown alga, were investigated from May 2018 to June 2019 in Jeju Island, Korea. The S. macrocarpum population formed patches at depths of 3-5 m. Growth in the length of the alga reached a maximum of 135.3±20.0 cm in June. The weight of the alga reached a maximum of 3.6±2.1 kg·wet-wt in May. The mean density and biomass of S. macrocarpum was 4.5 individuals·m-2 and 4.6 kg·wet-wt.·m-2 in their habitat. Receptacles were observed from April to August and egg release was detected from June to July when the seawater temperatures were 19.3-22.9℃. The developmental initiation of thalli occurred at temperatures above 14.1℃ and maturation required approximately 726.3 degree-days. The reproductive allocation of this alga, calculated from the reproductive frond length(RFL) and reproductive frond weight(RFW) indices to the whole length and weight, reached a maximum of 69.3% in June. The growth and maturation patterns of S. macrocarpum could be divided into vegetative growth (October-January), maturity preparation (February-April), maturation (May-June), egg release (June-July), and resting period (August-September). This was the first study to examine an S. macrocarpum population throughout the entire year in a natural habitat in Jeju Island, Korea.

Establishment of Early Diagnosis and Surgical Operative Method in Puppies with Congenital Patellar Luxation (선천성 슬개골탈구를 지닌 자견의 조기 진단법 및 외과적 수술법 확립)

  • 정순욱;박수현
    • Journal of Veterinary Clinics
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    • v.16 no.2
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    • pp.309-320
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    • 1999
  • Medial patellar luxation in dogs is one of the most common patellar problems presented to the veterinary practitioner. It is observed in toy and miniature breed and the majority of cases is a congenital form. Because of extensor mechanism's instability, it causes deformity and disorder in the growth of the affected limb when the luxation is left without treatment As lameness is not easily detectable in puppies, early diagnosis and correction are essential for therapy. Up to now, there has not been any reports refering to the diagnostic methods and the optimal age for correction in young dogs. Thirteen 45-90 days old puppies, have grade I and/or II medial patellar luxation. Only by palpation, all 13 dogs were diagnosed of patelar luxation. Skyline radiographic view was useful to interpret patellar morphology and depth of trochlear groove only above 60 days old. However, it was difficult to make definite diagnosis patellar luxation. The caudocranial and lateral radiographic view as well as ultrasonographic skyline view were not showed of patellar luxation. 2 puppies had unilateral patellar luxation and 11 puppies had bilateral patellar luxation which more serious on the left than on the right. Only 3 puppies among 11 puppies with bilateral patellar luxation were observed of lameness degree 1. Regardless of grade of patellar luxation and lameness, we performed trochlear chondroplasty using a U-shape sculpture blade to minimize cartilage injury, transposition of tibia tuberosity with No. 1 Supramid to align extensor mechanism and lateral imbrication. After surgery, we examined the operated animal daily for 10 days and on 15, 30 and 60 days after surgery respectively. After operation, pain and fever became normal on 7 days, swelling on 10 days, respectively. On 10 days after surgery, dogs showed normal standing position, and normal walking was observed in 15 days after surgery. In force plate analysis, the operated legs were normal weight bearing at 30 days after operation. After surgery, not only patellar luxation and clinical signs have been gradually reduced but also bone growth have become normal without showing growth physeal plate injury. The survival rate of puppies over 62 days old was 100%, while 42-45 days old 37.5%. The above results suggest that optimal age for surgical correction of congenital medial patellar luxation is recommended over 60 days old. In conclusion, combination of trochlear chondroplasty, transposition of tibia tuberosity, and lateral retinacular imbrication is appropriate for over 60 days old puppies to efficiently correct patellar luxation.

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Crop Monitoring Technique Using Spectral Reflectance Sensor Data and Standard Growth Information (지상 고정형 작물 원격탐사 센서 자료와 표준 생육정보를 융합한 작물 모니터링 기법)

  • Kim, Hyunki;Moon, Hyun-Dong;Ryu, Jae-Hyun;Kwon, Dong-Won;Baek, Jae-Kyeong;Seo, Myung-Chul;Cho, Jaeil
    • Korean Journal of Remote Sensing
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    • v.37 no.5_1
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    • pp.1199-1206
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    • 2021
  • Accordingly, attention is also being paid to the agricultural use of remote sensing technique that non-destructively and continuously detects the growth and physiological status of crops. However, when remote sensing techniques are used for crop monitoring, it is possible to continuously monitor the abnormality of crops in real time. For this, standard growth information of crops is required and relative growth considering the cultivation environment must be identified. With the relationship between GDD (Growing Degree Days), which is the cumulative temperature related to crop growth obtained from ideal cultivation management, and the vegetation index as standard growth information, compared with the vegetation index observed with the spectralreflectance sensor(SRSNDVI & SRSPRI) in each rice paddy treated with standard cultivation management and non-fertilized, it was quantitatively identified as a time series. In the future, it is necessary to accumulate a database targeting various climatic conditions and varieties in the standard cultivation management area to establish a more reliable standard growth information.