• 제목/요약/키워드: Maturity degree

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Evaluation of Composting Characteristics According to the Air Supply Change in Farm-Sized Swine Manure (농가규모 양돈분뇨 퇴비화시 공기공급량 변화에 따른 퇴비 특성 평가)

  • Lee, Sunghyoun;Jeong, Gwanghwa;Lee, Dongjun;Lee, Donghyeon;Jang, Yuna;Kwag, Junghoon
    • Journal of the Korea Organic Resources Recycling Association
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    • 제27권3호
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    • pp.49-61
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    • 2019
  • Swine manure has been recognized as a organic sources for composting and many research was conducted to efficiently utilize and treat. This study was to evaluate a feasibility for producing swine manure compost under various treatment with mixture of swine manure and saw dust. Treatments were designed as follows; non aerated composting pile(REF), aerated composting pile of $100L/m^3$(EXP1), and aerated composting pile of $150L/m^3$(EXP2). The total days of fermentation were 28 days and each samples were collected at every 7 days from starting of composting. Temperature sensors were installed under 30~40cm from the surface of composting pile. Inner temperature in composting piles of EXP1 and EXP2 was rapidly increased to $67{\sim}75^{\circ}C$ within 1~2 days. The elevated temperatures found during the thermophilic phase are essential for rapid degradation of organic materials. While swine manure composted, moisture content, total nitrogen, EC of EXP1, EXP2 in sample at 28 days were lower than those of REF. But, pH and organic matter of EXP1, EXP2 in sample at 28 days were higher than those of REF. After finishing fermentation experiment, maturity was evaluated with germination test. Calculated germination index(GI) at REF, EXP1 and EXP2 were 23.49, 68.50 and 51.81, respectively. The values of germination index were higher at EXP1 and EXP2 which is aerated composting piles than REF which is non aerated composting pile. According to the results, composting process by aerated static pile compost had significant effect on the reduction of required period for composting. Supplying adequate amount of air to compost swine manure will greatly reduce composting period.

Changes in Characteristics of Semi-cured Pig Manure Liquid Fertilizer according to the Storage Duration and Aeration (반부숙상태 돈분뇨 액비의 저장기간 및 폭기여부에 따른 특성 변화)

  • Jeong, Kwang-Hwa;Park, Hoe-Man;Lee, Dong-Jun;Kim, Jung-Kon;Kim, Hyunjong
    • Journal of the Korea Organic Resources Recycling Association
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    • 제30권4호
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    • pp.109-122
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    • 2022
  • Currently, most of the pig manure generated from pig farms in Korea is in the form of a slurry with a moisture content of about 97%. Pig manure slurry is a mixture of pig manure and cleaning water in the pig house. In this study, changes in properties of pig manure liquid fertilizer according to whether air was supplied or not and with the passage of storage period were analyzed for 120 days. During the experimental period, the degree of maturity of the pig manure liquid fertilizer was higher in the experimental closed batch reactors supplied with air than in the same type reactors not supplied with air. As the liquid fertilizer storage period elapsed, there was a tendency that liquid fertilizer was converted to a state of complete maturity. In the batch reactor in which air was supplied, the moisture content of pig manure slurry, which had a moisture content of 97.90%, was reduced to 96.82% at the end of the experiment. On the other hand, the moisture content in the reactor without air was reduced to 97.33%. The pH of the liquid fertilizer, which was 8.82 at the start of the experiment, changed to 7.57 in the reactor with air supplied and 8.75 in the reactor without air at the completion of the experiment. The nitrogen content in the liquid fertilizer was 0.198 mg/L on average at the start of the experiment and it was lowered to 0.076 mg/L in the air supplied reactor at the end of the experiment. On the other hand, the nitrogen content of the liquid fertilizer was lowered to 0.121 mg/L in the reactor to which air was not supplied. The phosphoric acid (P2O5) concentration in the liquid decreased higher in the liquid fertilizer filled in the reactor without air than the liquid fertilizer filled in the reactor with air supplied as the storage period elapsed. Considering the experimental results, it is considered that the quality of pig manure liquid fertilizer is improved when air is supplied to pig manure slurry and the storage period of pig manure slurry is longer.

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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    • 제45권1호
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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.

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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    • 제27권2호
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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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Variation of Yield and Yield. Components of Wheat and Barley Cultivars in Accordance with Different Seeding Rate and Fertilizer Level (시비량과 파종량의 변동에 따른 맥류 수량구성요소의 변이)

  • Jung-Hyun Choi;Jae-Young Cho
    • KOREAN JOURNAL OF CROP SCIENCE
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    • 제21권2호
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    • pp.233-249
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    • 1976
  • This experiment was conducted in an attempt to find the variation of growth, yield components and .yield in accordance with different seeding rate and fertilizer level. The degree of yield increase by increased fertilizer level was higher in heavy spike type .than in high tiller type. but that by increased seeding rate was the reverse in barley and wheat. 1, 000 .grains weight and maturity was increased by increased fertilizer level in heavy spike type (Haganemugi and Young Kwang) but decreased in high tiller type (Suweon #165 and Yuk Seung#3).

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Effect of Temperature and Daylength on Flowering and Growth Characteristics (온도와 일장조건에 따른 참깨 개화 및 생육특성 영향)

  • Shim, Kang Bo;Goo, Bon Il;Shin, Myoung Na;Jeon, Won Tae
    • KOREAN JOURNAL OF CROP SCIENCE
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    • 제65권3호
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    • pp.241-247
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    • 2020
  • Sesame is typically a temperature- and day length-sensitive plant, as its flowering is promoted under high temperature and shorter day length conditions. The experiment carried out in the present study revealed that day length influenced sesame flowering to a much greater extent than temperature. The degree of day length influence differed depending on the sesame variety. Days from sowing to flowering was negatively correlated with yield-related characteristics such as stem length, capsule number per plant, 1,000 seed weight, and seed weight per 10a. In cases where the period from sowing to flowering was longer and flowering date was later, the reproductive growth period was shorter during maturity. Analysis of the effects of temperature and day length on seed yield production revealed that temperature was a much more influential factor than day length. However, day length was more influential than temperature under low temperatures, such as 22℃. All varieties apart from Ansan were shown to be primarily influenced by temperature. Sesame varieties were grouped in view of optimal seed sowing time through principal components analysis. The Poongsung and Sungboon varieties favored early sowing under low temperatures and short day lengths. The DT45, Poongsung, 90 days, Ansan, and Sungboon varieties favored late sowing under high temperatures and long day lengths. The Yangbaek and Arum varieties could be sown both early and late.

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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    • 제33권1호
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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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    • 제10권2호
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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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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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    • 한국작물학회 2017년도 9th Asian Crop Science Association conference
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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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Production and utilization of organic compost from spent mushroom (Pleurotus eryngii) substrate (큰느타리버섯 수확 후 배지를 이용한 유기퇴비 제조 및 활용)

  • Lee, Sang-Hwa;Park, Ju-Ri;Oh, So-Ra;Ryu, Song-Yi;Ryu, Young-Hyun;Kang, Min-Gu;Lee, Suk-Hee;Jo, Woo-Sik
    • Journal of Mushroom
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    • 제16권1호
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    • pp.39-44
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    • 2018
  • We investigated the possibility of utilizing spent mushroom culture-medium as raw material to produce organic compost. Mushroom culture-medium contained 2.69% nitrogen, 41.07% carbon, and 0.99% phosphoric acid. Nitrogen and carbon content in rice bran were 3.08% and 47.34%, respectively. Nitrogen, carbon, and phosphoric acid content in mushroom Pleurotus eryngii were 3.41%, 34.63%, and 1.70%, respectively. Our study aimed to evaluate the degree of decay of compost produced from the substrate, used to culture King Oyster mushrooms by analyzing seed germination indexes in cucumber, radish, lettuce, and Chinese cabbage. Our results showed that compost from spent mushroom culture-medium completed the stabilization process in 4 to 6 weeks, as evaluated by the appropriate organic compost maturity point for the plantation.