• Title/Summary/Keyword: Degree of maturity

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Effect of natural anti-microbe chemicals, chitosan and stevia, on the growth, yield, and quality of chili peppers

  • Shim, Sang Wan;Kim, Hyuk Jin;Park, Jin Young;Bae, Tae Min;Min, Jeong Ho;Lee, Jin Su;Kim, Sung Joo;Hwang, Yong Soo
    • Korean Journal of Agricultural Science
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    • v.45 no.1
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    • pp.19-27
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    • 2018
  • To study the effect of natural anti-microbial chemicals on the growth and quality of chili peppers, chitosan ($100mg/L^{-1}$), stevia ($250mg/L^{-1}$), and the mixture of both chemicals at the same concentration were sprayed after planting at 1-week interval throughout the experimental period. Plant height was measured twice after the $3^{rd}$ and $4^{th}$ applications. Plant height was numerically reduced in all chemical treatments compared to that of untreated control; however, there was no statistical difference between treatments. The fruit quality was examined at commercial maturity, and only minor differences were found in fruit color, length, and dry matter content between the treatments. Although a statistical difference was not present for soluble sugars levels, total phenolics, and capsaicin contents, yield in all chemical treatments significantly increased compared to untreated control. The effect on yield increase was greater at the late harvest season regardless of treatments. Total yield of 4 harvests was higher for the chitosan treatment than other treatments. During the experiment, the entire experimental field was waterlogged for 1 day due to sudden heavy rainfall, which resulted in the occurrence of bacterial browning disease in all treatments. The rate of disease occurrence and the degree of severity, however, were much lower in the chitosan treatment. In conclusion, the potential of chitosan as an alternative antimicrobial agent was confirmed in chili peppers in this study. Further research is required on stevia as an alternative chemical for disease control in chili peppers.

Changes in Sporophore Appearance of Cultivated Mushroom, Agaricus bisporus, during the Harvesting Period (양송이 자실체(子實體) 발생(發生)의 경시적(經時的) 변동(變動)에 관한 연구(硏究))

  • Park, Jong-Seong;Shin, Gwan-Chul
    • Korean Journal of Agricultural Science
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    • v.4 no.1
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    • pp.43-50
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    • 1977
  • This stuy was conducted to analyse the variation in occurrance of fruit body of Agaricus bisporus (Lange) Sing, depending on difference of cultivation and harvesting method and to find out a method for early predicting the mushroom yield potential at the base of results of the analysis. The results obtained were as follows ; 1. Total mushroom yield was highly correlated with picking amount of fruit bodies during first 30 days of picking period, and yield potentiality in the certain high yielding mushroom house was markedly affected with the yield of middle and late period of picking. 2. Variation of mushroom yield with varying the degree of maturity of fruit bodies appeared to be different between spring and autumn cropping : in case autumn cropping was usally undertaken with normal cropping scheme, mushroom yield showed a reduction in early period of picking but an increase in late period when the mushrooms where picked at pre-matured stage. 3. When the picking rate of button form was laid in the range of 20~45%, and increase of total mushroom yield was accompanied by an increasing tendency of picking rate of button form. 4. Cropping results from mushroom houses could be early predicted from the regression equations, which was based on the analysis of variation in fruit body occurance throughout the picking period.

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Measuring Agreement of Modified MP3 and CVMS according to BMI Percentile (중지 중절골과 경추를 이용한 골령 평가의 체질량 지수에 따른 일치도)

  • Yi, Seoksoon;Lee, Daewoo;Yang, Yeonmi;Kim, Jaegon
    • Journal of the korean academy of Pediatric Dentistry
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    • v.46 no.1
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    • pp.48-56
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    • 2019
  • The objective of this study was to examine measuring agreement between middle phalanx of the third finger and cervical vertebrae analysis for assessing skeletal maturity according to body mass index percentile. A retrospective chart view was used to select patients with body mass index data, hand - wrist radiographs and lateral cephalograms of same day. The patients were divided into 4 groups by body mass index percentile. The hand - wrist radiographs were analyzed using modified middle phalanx of the third finger method and the lateral cephalograms were categorized according to cervical vertebral maturation stage. The degree of agreement between the 2 methods of analyzing skeletal maturation was measured by calculating weighted kappa statistic according to body mass index percentile group. There was a good agreement between the 2 methods in the entire body mass index percentile group. According to the body mass index percentile group, the agreement was found to be different, and the pattern was different between boys and girls. Pediatric dentist should consider sex and weight status when evaluating growing children and adolescents because it can affect the agreement of 2 method of analyzing skeletal maturation.

Characteristics of Vegetation Structure in Chamaecyparis Obtusa Stands (편백림의 식생구조 특성 분석)

  • Park, Seok-Gon;Kang, Hyun-Mi
    • Korean Journal of Environment and Ecology
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    • v.29 no.6
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    • pp.907-916
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    • 2015
  • The purpose of this study was to identify characteristics of vegetation structure, vegetation succession, and species diversity of artificially planted Chamaecyparis obtusa (CO) stands. The study was carried out by performing vegetation survey for eight CO stands located in Jeollanam-do Province, Korea. Analysis on vegetation classification and ordinations of the stands was conducted using the data from the vegetation survey, and as a result, the stands were classified into five types of communities. Community I showed a considerably lower index of species diversity when compared to other communities because the canopy of the dominant CO was so highly dense that the low-height vegetation was not able to develop or the low-height vegetation almost disappeared due to elimination of weed trees. Meanwhile, the Community II - IV had relatively higher indices of species diversity because various native tree species mixed with the low-height vegetation and competed with each other in the understory and shrub layers to some degree of stability or in their early stage of vegetation development. Community V, lastly, showed higher use intensity as a recreational forest, thus developing simpler vegetation structure on account of artificial intervention. There was positive correlation between photosynthetically active radiation entering the forest floor, number of observed species and index of species diversity. Such characteristics of vegetation structure in CO stands are closely associated with forest management and prescription for planting reforestation, thinning, and brush cutting in the past. There was a slight difference in vegetation structure and species diversity by communities, based on rotation time of the vegetational succession, process of disturbance frequency and disturbance, development, and maturity by planting CO stands. However, when compared to natural forests, the CO stands showed simpler vegetation structure. Because artificial forests are vulnerable in ecosystem service with lower species diversity, a drive for ecological management is needed for such forests to change into healthy ecosystems that can display functions of public benefit.

Comparison of the Chicken Large Intestine to the Large Intestine of Pigs and the Rumen of Cows (닭의 대장을 돼지의 대장이나 소의 제 1위 (Rumen)와 비교 연구)

  • Nahm K.H.
    • Korean Journal of Poultry Science
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    • v.33 no.1
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    • pp.81-95
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    • 2006
  • The large intestine of the chicken differs both anatomically and physiologically from the pig's large intestine and the men of the cow. The chicken's large intestine is less developed than the pig's large intestine or the cow's lumen. This paper summaries these differences. The chicken's large intestine contains a microbiological population similar to that found in the rumen. The chicken's caeca especially contains a large number of microorganisms, but this population varies according to age, fred, maturity, antibiotic use and etc.. Protein is an essential nutrient for the formation of intestinal microvilli. A study showed that the length of the small intestine was 63 % of the total gastrointestinal tract (GIT) length, while caecum was 8.1 %, and the colon and rectum were 4.6 %. The establishment of the microbial population of the small intestine occurs earlier than that of the caeca, but the identity of approximately 90 % of microbial population of the chicken GIT is hon. Recent studies have shown that energy, volatile fatty acid (VFA) and electrolytes that are found in the large intestine may be absorbed to a certain degree. The chicken small intestine is the primary location for digestion with a variety of enzymes being secreted here. Much research is being conducted into the digestion of sucrose thermal oligosaccharide caramel (STOP), fructooligosaccharides (FOS), mannanoligosaccharide (MOS), galactooligosaccharides (GOS) and isomalto-oligosaccharides (IMO) in the chicken caeca and large intestine. Excessive fibre content in the feed has detrimental effects, but proper fibre supplementation to chicken diets can improve the length and capacity of the small intestine.

Effect of Embryo Maturity and Medium on Callus Formation and Plant Regeneration from Immature Embryo of Eleutherococcus senticosus (가시오갈피 미숙배로부터 Callus 형성 및 식물체 재분화에 미치는 배의 성숙정도 및 배지의 효과)

  • 유창연
    • Korean Journal of Plant Resources
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    • v.10 no.2
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    • pp.122-127
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    • 1997
  • This study was conducted to establish mass propagation system from the tissue culture using immature embroys in Eleutherococus senticosus. Immature embroys from seeds were removed under the microscope and placed on modified SH and WPM medium containing several plant growth regulators. The calli were well formed on media containing 1mg/l of 2,4-D on modified SH medium and 1mg/l of 2,4-D and 3mg/l of TDZ on WPM medium. Shoot regeneration was better on modified SH or WPM medium with combination of high concentration of TDZ and low concentration of 2,4-D. Treatment of 2,4-D alone was better than treatment of TDZ alone in callus induction on modified SH medium but plant regeneration reversed. Treatment of 2.4-D and TDZ combination was better than treatment of 2,4-D alone in callus induction on WPM medium. The results of callus formation and shoot regeneration on WPM media differed to those of SH media. The rate of callus formation was nearly 83% when 2,4-D was added to SH medium on concentration of 1mg/l. The rate of callus formation was nearly 38% when combination treatment of 2,4-D 1mg/l and TDZ 3mg/l was added to WPM medium. Also, plant regeneration differed depending on the mature degree of immature embryo.

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The Agricultural Utilization of Daecheong Lake Sediments and Algae (대청호(大淸湖) 저니(底泥) 및 조류(藻類)의 농업적(農業的) 활용(活用) 연구(硏究))

  • Chang, Ki-Woon;Lim, Jae-Shin;Lee, In-Bog
    • Korean Journal of Soil Science and Fertilizer
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    • v.27 no.2
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    • pp.111-116
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    • 1994
  • These studies were carried out to investigate the possibility on the agricultural utilization of lake sediment collected in the Daecheong Lake. Several parameters to estimate the degree of maturity of compost by windrow system were tested during a 50 day periods, and the results were as follows : During the composting of Daecheong Lake sediment, C/N ratio decreased gradually from 18.9 at the beginning to 13.1 at the final, while CEC increased from 33.5me/100g to 62.5me/100g. The temperature of lake sediment pile was the highest as $52^{\circ}C$ at 15th day and then decreased slowly until $30^{\circ}C{\sim}40^{\circ}C$ after 50 days. The results may be suggested that Daecheong Lake sediment compost reaches an acceptable level of stability after about 50 days. In order to know the effect of the Lake sediment and its compost on the growth of tomato(Lycopersicum esculentum M.), pot experiments were performed. The appiication of lake sediment(AS) itself, sediment organic fertilizer(SOF), and NPK mixed with sediment organic fertilizer(NSF) was more effective for tomato plant height, fresh and dry weight, and chlorphyll content than those of control treatment. Also, the lake sediment compost improved the physico-chemical properties of soil such as pH, total carbon, total nitrogen, available phosphorous and CEC.

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Analysis of the Characteristics of Maxillary Supernumerary Lateral Incisor (상악 측절치 과잉치의 특징 분석)

  • Nah, Jeungseon;Lee, Koeun;Kim, Misun;Nam, Okhyung;Choi, Sungchul;Lee, Hyo-Seol
    • Journal of the korean academy of Pediatric Dentistry
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    • v.49 no.1
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    • pp.25-34
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    • 2022
  • This study aimed to investigate a quantitative analysis of the anatomical characteristics of the maxillary supernumerary lateral incisor and its relationship with lateral incisors. Forty-four supernumerary lateral incisors from 43 patients were evaluated for analyzing the position, shape, direction, and relationship between the supernumerary lateral incisor and the normal lateral incisors, using cone-beam computed tomography (CBCT). To compare the size of crown, the mesio-distal width was measured and the Nolla stage was used for evaluating the degree of root development to compare tooth maturity. The supernumerary lateral incisors were in the normal direction at a rate of 90.9%, and in a supplemental shape at a rate of 84.1%. The supernumerary lateral incisor was smaller in size compared to the adjacent lateral incisor and opposite lateral incisor (p < .0001). There was no statistically significant difference in the development stage of root. Based on these results, the supernumerary lateral incisor is similar with the lateral incisor, but has a difference in the size of crown. It is necessary to distinguish the supernumerary lateral incisor from the lateral incisor precisely to reduce clinical complications.

Growth and yield responses of rice varieties to various soil water deficit conditions under different soil types

  • Kikuta, Mayumi;Samejima, Hiroaki;Magoti, Rahab;Kimani, John M.;Yamauchi, Akira;Makihara, Daigo
    • Proceedings of the Korean Society of Crop Science Conference
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    • 2017.06a
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    • pp.322-322
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    • 2017
  • To avoid drought stress under rainfed upland conditions, it is important for rice to efficiently utilize water at shallow soil layers supplied by rainfall, and access to water retained in deer soil layers. The root developmental characteristics of rice, which play important role in the adaptability to drought conditions, vary depending on the variety. Moreover, water availability for plant differs depending on the soil types that have different physical properties such as water holding capacity, permeability, capillary force, penetration resistance, etc. In this study, we evaluated growth and yield responses of rice varieties to various soil water deficit conditions under three different soil types. The experiment was conducted in a plastic greenhouse at the Kenya Agricultural and Livestock Research Organization-Mwea from October 2016 to January 2017. Two upland varieties (NERICA 1 and 4) and one lowland variety (Komboka) were grown in handmade PVC pots (15.2 cm diameter and 85.0 cm height) filled with three different types of soil collected from major rice-growing areas of the country, namely black cotton (BC), red clay (RC), and sandy clay (SC). Three watering methods, 1) supplying water only from the soil surface (W1), 2) supplying water only from the bottom of the pots (W2), and 3) supplying water both from the soil surface and the bottom of pots (W3), were imposed from 40 days after sowing to maturity. Soil water content (SWC) at 20, 40, and 60 cm depths was measured regularly. At the harvesting stage, aboveground and root samples were collected to determine total dry weight (TDW), grain yield, and root length at 0-20, 20-40, 40-60, and 60-80 cm soil layers. Irrespective of the watering methods, the greatest root development was obtained in RC, while that in BC was less than other two soils. In BC, the degree of yield reduction under W1 was less than that in RC and SC, which could be attributed to the higher water holding capacity of BC. In RC, the growth and yield reduction observed in all varieties under W1 was attributed to the severe drought stress. On the other hand, under W2, SWC at the shallow soil depth in RC was maintained because of its higher capillary force compared with BC and SC. As the result, growths and yields in RC were not suppressed under W2. In SC, deep root development was not promoted by W2 irrespective of the varieties, which resulted in significant yield losses. Under W1, the rice growth and yield in SC was decreased although shallow root development was enhanced, and the stomatal conductance was maintained higher than RC. It was suspected that W1 caused nutrients leaching in SC because of its higher permeability. Under rainfed conditions, growth and yield of rice can be strongly affected by soil types because dynamics of soil water conditions change according to soil physical properties.

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Identification of Phytotoxic Compounds and Allelopathic Effects of Various Upland Weeds (전작잡초(田作雜草)로부터 생리활성물질(生理活性物質) 탐색(探索))

  • Back, K.W.;Kim, K.U.
    • Korean Journal of Weed Science
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    • v.8 no.3
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    • pp.283-290
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    • 1988
  • This study was conducted to clarify the identification of phytotoxic compounds from 5 upland weeds which had been collected at their maturity age in the field of Kyungpook province, Korea. 5 weed species including Stellaria aquatica strongly inhibited the lettuce seed germination. These 5 species were Amaranthus lividus, Stellaria aquatica, Achyranthes japonica, Polygonum perfoliata and Galinsoga ciliata. the degree of inhibitory effects according to various solvent extracts such as ethanol, aceton, chloroform and ether was different as species. In total phenol and diphenol content G. ciliata had largest amount of total phenol with 2.75mg/g, P. perfoliata 1.8mg/g, S. aquatica 1.7mg/g, A. lividus 1.28mg/g, A. japonica 1.27mg/g respectively. A. lividus had much amount of p-cresol, hydroquinone, ferulic, caffeic, p-cl-benzoic and p-coumaric in order. S. aquatica, A. japonica, P. perfoliata and G. ciliata had a large quantity of ferulic, caffeic, 7-OH-coumarin and protocatechuic acids in common. The amount of fatty acids was existed 8.49mg/g in S. aquatica, 7.14mg/g in A. japonica, 7.10mg/g in G. ciliata, 5.49mg/g in P. perfoliata and 4.2mg/g in A. lividus respectively. Most of 4 weeds except G. ciliata had much oxalic acid to the extent of 14-22mg/g. however it appeared that G. ciliata had much quantity of feruic and citric acids.

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