Seo, Tae Cheol;An, Se Woong;Kim, Sun Min;Nam, Chun Woo;Chun, Hee;Kim, Young Chul;Kang, Tae Kyoung;Kim, Sung Woo;Jeon, Su Gyeong;Jang, Kil-Su
Journal of Bio-Environment Control
/
v.26
no.4
/
pp.368-377
/
2017
This study investigated the possibility of application of the recently introduced cylindrical paper pot seedlings in hot pepper (Capsicum annuum L.) cultivation. The seedling growth, initial rooting after planting and accumulated fruit yield were investigated with the treatments of tray type (paper pot and plug) as a main factor, tray cell number (40 cell and 50 cell) as a sub-factor, and fertigation method (continuous fertigation and fertigation after 35 days sowing) as a sub-sub factor, respectively. The growth of pepper seedlings was significantly affected by tray type and fertigation method showing the highest value at 50 cell plug tray with continuous fertigation, and the effect of fertigation was greater than that of trays. 'Cheongyang', 'Daekwonseoneon' and 'Longgreenmat' cultivar showed all the same pattern in seedling growth. These three-cultivar seedlings were planted in plastic house and in open field in Jeonju area, respectively, and another 'Daekwonseoneon' seedlings raised Yeongyang local area was also planted at the same area. There was no difference in the rooting of 'Cheongyang' pepper at 2 weeks after planting in plastic house. The accumulated fruit weight was not significantly different between paper pot seedlings and plug seedlings in three cultivar grown in plastic house. However, that of 'Cheongyang' pepper showed higher at paper pot seedlings than plug seedlings and the other two cultivar were higher at plug seedlings in open field. 'Daekwonseoneon' pepper yield grown in open field in 'Yeongyang' area was not significant between paper pot seedlings and plug seedlings. In conclusion, the pattern of seedlings growth grown in the cylindrical paper pot was the same as those of the conventional plug seedlings and also fruit yield was similar between paper pot seedlings and plug seedlings even though minute difference among cultivars. These results suggest that pepper seedlings grown in paper pot should be highly applicable to pepper cultivation.
This study was carried out to investigate the effect of sawdust bedding barn on manure handing, management labour and physiological aspect of dairy cows, and then to establish the criteria on the optimum utilization method of sawdust bedding barn. 46 tie stall barns and 49 sawdust bedding barns were surveyed to cmopare the milk productivity between two different barns, and also 5 tie stall barns, 15 sawdust bedding barns and 1 rice hull bedding barn were selected to study the utilization situation of sawdust barn in Kyung-Ki province area. The major results obtained were as follows; 1. The roof material of sawdust barn were consisted of 66% vinyl house, 23% PVC light and 11% slate and galvanum coated tin. Most of the floor structure was earth ground with the rate of the approximately 82%. 2. The average occupied area of sawdust bed per cow was 15.2 $m^2$, depth that 30 cm and the utilization period was 12 months. 3. Milk Yield was significantly higher at sawdust barn than at tie stall barn(P<0.01). Bacterial and somatic cell count in raw milk were less at the sawdust barn than in tie stall barn. However, there was not significance difference between two barns. 4. The labour hour needed to cow management in the sawdust barn was approximately 48% of that of tie stall barn. 5. The temperature and moisture content measured in sawdust bed were closely affected by seasonal ambient temperature. The skin and hair of cow were much cleaner at the PVC light roofed sawdust barn than any other roof materials. 6. The additives used for improving of fermentation did not show any effect on temperature and moisture content in sawdust bed. When the ambient temperature was $30.4^{\circ}C$, the surface temperature of measured 1 cm above the sawdust bed was $12.2^{\circ}C$ lower and the temperature of 100 cm above the sawdust bed was $2.4^{\circ}C lower under shading net facility than that of vinyl roofed one.7. The hoof length of miking cow was 7.95 cm in tie stall and 9.19 cm in sawdust barn with high significance (P<0.01). And disease occurence such as mastitis and foot-rot tended to decrease in the sawdust barn. 8. The number of total bacteria and coliform bacteria were less in the sawdust bed compared with earth ground resting area. And a parasite strongyloides papillosus was detected but without any infected cow. 9. The nitrate($NO_3N$) content in non-roofed earth ground resting area and earth ground under the sawdust bed was likely to pollute the ground water. 10. In economic point of view, rice hull bedding barn was the cheapest among different systems. And in the sawdust bedding barn PVC light + slate roofed barn was most desirable, and vinyl roofed one the least.
Stevia (Stevia rebaudiana Bertoni) is a perennial herb widely distributed in the mountainous area of Paraguay. It belongs to the family Compositae and contains 6 to 12 percent stevioside in the leaves. Stevioside is a glucoside having similar sweetening character to surgar and the degree of sweetness is approximately 300 times of sugar. Since Korea does not produce any sugar crops, and the synthetic sweetenings are potentially hazardous for health, it is rather urgent to develop an economical new sweetener. Consequently, the current experiments are conducted to establish cultural practices of stevia, a new sweetening herbs, introduced into Korea in 1973 and the results are summarized as followings: 1. Days from transplanting of cuttings to the flower bud formation of 6 stevia lines were similar among daylengths of 8, 10 and 12 hours, but it was much greater at daylengths of 14 or 24 hour and varietal differences were noticable. All lines were photosensitive, but a line, 77013, was the most sensitive and 77067 and Suweon 2 were less sensitive to daylength. 2. Critical daylength of all lines seemed to be approximately 12 hours. Growth of plants was severely retarded at daylengths less than 12 hours. 3. Cutting were responded to short daylength before rooting. Number of days from transplanting to flower bud formation of 40-day old cuttings in the nursery bed was 20 days and it was delayed as duration of nursery were shorter. 4. Number of days from emergence to flower bud formation was shortest at short day treatment from 20 days after emergence. It was became longer as initiation of short day treatment was earlier or later than 20 days. 5. Plant height, number of branches, and top dry weight of stevia were reduced as cutting date was delayed from March 20 to May 20. The highest yield of dry leaf was obtained at nursery duration of 40-50 days in march 20 cutting, 30-40 days in April 20 cutting, and 30 days in May 20 cutting. 6. An asymptotic relationship was observed between plant population and leaf dry weight. Yield of dry leaf increased rapidly as plant population increased from 5,000 to 10,000 plants/10a with a reduced increasing rate from 10,000 to 20,000 plants/l0a, and levelled off at the plant population higher than 20,000 plants/l0a. 7. Stevia was adaptable in Suweon, Chengju, Mokpo and Jeju and drought was one of the main factors reducing yield of dry leaf. Yield of dry leaf was reduced significantly (approximately 30%) at June 20 transplanting compared to optimum transplanting. 8. Yield of dry leaf was higher in a vinyl house compared to unprotected control at long daylength or natural daylength except at short day treatment at March 20. Higher temperature ill a vinyl house does not have benefital effects at April 20 transplanting. 9. The highest content of stevioside was noted at the upper leaves of the plant but the lowest was measured at the plant parts of 20cm above ground. Leaf dry weight and stevioside yield was mainly contributed by the plant parts of 60 to 120cm above ground but the varietal differences were also significant. 10. Delayed harvest by the time of flower bud formation increased leaf dry weight remarkably. However, there were insignificant changes of yield as harvests were made at any time after flower bud formation. Content of stevioside was highest at the time of flower bud formation and earlier or later harvest than this time was low in its content. The optimum harvesting time determined by leaf dry weight and stevioside content was the periods from flower bud formation to right before flowering that would be the period from September 10 to September 15 in Suweon area. 11. Stevioside and rebaudioside content in the leaves of Stevia varieties were ranged from 5.4% to 14.3% and 1.5% to 8.3% respectively. However, no definit relationships between stevioside and rebaudioside were observed in these particular experiments.
In order to analyze the effects of percolation rate on the growth and yield of rice plants in paddy soils, pot (1a/2000) experiments were carried out. The soil used was highly concentrated with various salts in the horticulture area under vinyl house cultivation, and Samgang variety of Japanica rice was planted. With the increasing rates of percolation, $SiO_2$ and $Ca^{2+}$ were more leached out from soils than supplied by irrigation while $K^+$ and $NH_4{^+}$ were more supplied to soils than leached out. The root activity in the late growth stage was higher in the percolation pots than in the non-percolation pots. Amounts of nutrient uptake of T-N, $P_2O_5$, $K_2O$ and MgO were increased gradually with the increase of percolation rate, but that of $SiO_2$ was maximum at 10mm per day. The percolation rate of 5~10mm per day was considered to be the optimum condition for obtaining more than 95% of relative yield in rice cultivation.
Proceedings of the Korea Water Resources Association Conference
/
2009.05a
/
pp.2009-2013
/
2009
일반적으로 비닐하우스내의 농작물 경작은 자연환경과 차단된 조건에서 작물을 집약적으로 재배하므로 비료의 사용량이 많아 오염원으로 작용하고, 휴작기에 비닐을 제거 방치하므로 비닐 표면에 집적된 오염물은 강우 시 유출되어 이들로 인한 주변 하천수 및 지하수 오염을 가중시킨다. 따라서 팔당호 유역내 하천 부지에서 비닐하우스 등이 집단화 되어 있어 이로 인해 팔당호 유역내 수질에 영향을 미칠 것으로 판단된다. 또한 팔당호 유역내 하천부지에서 대단위 비닐농가가 집단적으로 조성되어 있는 것으로 조사되었으며, 팔당호 유역내 산발적으로 비닐하우스 농가가 형성되어 있는 것으로 조사되었다. 이들 비닐하우스로부터 비강우시에는 유출 오염수는 없는 것으로 파악되었으나, 강우 시 강우유출수가 표면 유출되는 과정에서 오염수가 팔당호로 직접 유입되어 팔당호 수질에 영향을 미치는 것으로 파악되었다. 팔당호 유역의 비닐하우스 경작에 의한 수질특성 조사 결과, SS 농도는 북한강 $372{\sim}446$$mg/{\ell}$, 남한강 $488{\sim}547$$mg/{\ell}$, 경안천 $345{\sim}415$$mg/{\ell}$로 조사되었으며, BOD 농도는 북한강 $12.2{\sim}15.3$$mg/{\ell}$, 남한강 $13.3{\sim}16.8$$mg/{\ell}$, 경안천 $15.6{\sim}18.8$$mg/{\ell}$으로 조사되었고, COD 농도는 북한강 $23.9{\sim}26.8$$mg/{\ell}$, 남한강 $25.2{\sim}26.0$$mg/{\ell}$, 경안천 $26.4{\sim}32.9$$mg/{\ell}$로 조사되었다. 또한 T-N 농도는 북한강 $17.39{\sim}23.64$$mg/{\ell}$, 남한강 $17.87{\sim}22.09$$mg/{\ell}$, 경안천 $18.34{\sim}19.55$$mg/{\ell}$으로 조사되었으며, T-P 농도는 북한강 $1.425{\sim}1.795$$mg/{\ell}$, 남한강 $1.519{\sim}1.767$$mg/{\ell}$, 경안천 $1.727{\sim}1.827$$mg/{\ell}$로 조사되었다. 또한, 오염부하량으로부터 산정된 비닐하우스의 하천에 미치는 오염부하기여율은 SS의 경우 17.3%, BOD 4.5%, COD 5.2%, T-N 11.0%, T-P 7.4%로 조사되었다. 이는 비닐하우스 농가에서 유출되는 SS 및 T-N, T-P 오염부하량이 하천에 미치는 영향이 상대적으로 높다는 것을 의미하며, 이는 비닐하우스 주변이 주로 나대지로 되어 있고 비료 또는 영양물질이 많기 때문인 것으로 판단된다. 그러나 탄소성 유기물질을 나타내는 BOD 및 COD의 오염부하기여율은 주변 토양과 큰 차이를 보이지 않았다. 결국 비닐하우스의 재배는 토양 표면피복의 효과적인 관리 및 영양물질에 대한 관리가 이루어지지 않을 경우 팔당호에 영향을 미칠 수 있을 것으로 판단된다.
Disposing technique for dairy cattle manure using earthworms and the possibility of utilizing earthworms in poultry feed were investigated. In addition, chemical properties of manure and cast of earthworms were investigated. Temperature in the vinyl-house for earthworm nursery was able to be maintained above 0$\^{C}$ in winter and 25-28$\^{C}$ in summer. In closed-covering method, the number of escaped earthworms was the highest among three covering methods. The time was longer after manure excretion, the numbers of escaped earthworm were higher. There were some incidences of mortality of earthworm in closed-covering site. The amount of manure ingested by earthworm was increased in order of non-covering, closed-covering and gap-covering method. Fresh manure was more ingested than old one by earthworm. Earthworms reduced manure about 50% on the dry weight base and reduced total amounts of N, P$_2$O$\_$5/ and K$_2$O of manure by 41, 50 and 60%, respectively. Earthworm could be utilized by adult poultry (>60 g) for feeding. However, adverse effect of live earthworm was observed with young poultry (<450 g).
The purpose of this study is to evaluate and seek the best suitable band and threshold boundary level on the change detection of image differencing method using Landsat TM data(20 May 1987 and 20 May 1993) in Pyeongtaeg City. The change detection images differencing method were evaluated by using normal reference data with an optimal threshold level{$mean{\pm}(SD{\times}T$ value). The normal reference data consisted of positive change{change dark into light in image pattern, that is, it changed arable land(paddy, upland, forest and so on) to artificial area(buildings, vinyl-house and roads, etc)} and negative change(change light into dark in image pattern, that is, it changed artificial area into arable land). As the result, the kappa coefficients of visible bands(D1, D2 and D3) were higher than those of infrared bands(D4, D5 and D7), and than D1 image with 1.0 thresholding and normal reference data was a improved result in the land-surface change detection such as kappa coefficient : 68.4%, overall accuracy : 89.2%, negative change : 6.6%, positive change : 10.6%.
Seo Mi-Ja;Kim Sun-Jin;Kang Eun-Jin;Kang Myong-Ki;Yu Yong-Man;Nam Myeong-Hyeon;Jeong Suk-Gee;Youn Young-Nam
Korean journal of applied entomology
/
v.45
no.1
s.142
/
pp.37-43
/
2006
Catch of garden thrips, Frankliniella intonsa, on sticky traps was assessed by color and height in commercial plastic vinyl house strawberry crops grown on 40-cm-high trellises. Yellow, blue and white sticky cards were tested for color attractiveness, and upper (50 cm), lower (10 cm above the floor) and ground were for height. At each height, trapped thrips on yellow, blue and white were significantly different. Blue sticky cards were significantly greater than traps on yellow and white. The trapped thrips were also significantly greatest at 50 cm above the floor, less at lower and ground. However, there is no significantly different the population of garden thrips on the flower in each tested site.
In this study, non-point source(NPS) contribution was investigated based on flow rates and water qualities of streams into the lake during rainfall events. Event mean concentration(EMC) and the pollution loads were calculated to establish a database for NPS control measurement in the survey area, and so on. The runoff characteristics of NPS were investigated and estimated on the basis of the ratio of an agricultural to forest area in the stream of sub-catch basin during rainfall events. Non-point source pollution loads were also calculated to establish a database for NPS control measure in the upstream lake Chinyang. At a rainfall event, BOD concentrations rise sharply at the early peak time of runoff, however, peaks of TSS concentration were observed at the similar time of peak flow. This was a phenomenon shown at the watersheds caused by forest and geological types. The discharged EMC range was 2.9-4.8 mg/L in terms of BOD. The discharged EMC range was 6.2-8.2 mg/L in terms of SS. The discharged EMCs of T-N and T-P were 1.4-2.5 mg/L and 0.059-0.233 mg/L, respectively. Total BOD loading rate through the 3 tributaries to the lake Chinyang was 1,136 kg/d during dry weather. The upper watershed area of the Nam-river dam in this study was divided into 14 catchment basins based on the Korean guideline for total maximum daily load(TMDL) of water quality pollutants. The higher the agricultural land-use ratio, the more NPS loading rate discharged, but the more occupied a forest area, the lower more NPS loading rate discharged. In an agricultural land-use area more than 20%, the increase of NPS loadings might be dramatically diffused by increasing the integrated complex-use like vinyl-house facilities and fertilizer use etc. according to the effective land-use utilization. The NPS loading rates were BOD 0.3 $kg/ha{\cdot}day$, SS 0.21 $kg/ha{\cdot}day$, TN 0.02 $kg/ha{\cdot}day$, TP 0.005 $kg/ha{\cdot}day$ under less than 10% agricultural land-use. In agricultural land-use of 20%-50%, these values were investigated in the range of 0.32 $kg/ha{\cdot}day$-0.73 $kg/ha{\cdot}day$ for BOD, 0.92 $kg/ha{\cdot}day$-3.32 $kg/ha{\cdot}day$ for SS, 0.70 $kg/ha{\cdot}day$-0.90 $kg/ha{\cdot}day$ TN, 0.03 $kg/ha{\cdot}day$-0.044 $kg/ha{\cdot}day$ for TP.
Shin Yong Seub;Kim Jwoo Hwan;Park So Deuk;Park Jong Wook;Kang Chan Koo;Kim Byung Soo;Khan Z.
Journal of Bio-Environment Control
/
v.14
no.1
/
pp.46-51
/
2005
This experiment was conducted to investigate planting depth, which applied the basic data for planting growth ability and mechanical planting of oriental melon. 'Gumssaragi-eunchun' variety was approach grafting to 'Shintozoa' and seedling was growing during 45 days in the 9cm pot and then planted on Jan. 16. The comparison of planting plots was carried out for four experimental plots, which were separated into 0cm, 4.5cm, 9cm, standard cultivation, and 12cm planting depth in soil. In the tunnel of vinyl house, the lowest and the highest temperature was $9.3^{\circ}C\;and\;41.2^{\circ}C$, respectively, and humidity was $59\~99\%$ during Jan. 18 and 19. The faster graft-take rate after planting was the deeper planting depth. The growth of 40 days after planting was not significant in each planting plot, except 0cm experimental plot. Fruit weight was the heaviest in 4.5cm planting depth of experimental plot but sugar content and flesh thickness were not significant in each planting depth. The more depth in planting meant the more increase in fermented fruit rate and decrease in marketable fruit rate. Marketable yield was 2,361kg per l0a in 9cm planting plot, which was $2\%\;and\;1\%$ lower than in 0cm and 4.5cm, respectively, and $11\%$ greater than in 12cm planting plot.
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