• Korean Journal of Agricultural Science
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• v.1 no.1
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• pp.9-26
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• 1974

1. Results in Nursery This experiment was carried out on the effect of the seed treament, soil preparations, kinds of covering soil and inside covering methods in two rice varieties, 'Tongil' and 'Akibare' to find out the most reasonable model of the flat nursery bed, with which lower cost is required comparing with the tunnel nursery. The results obtained are as follows: (1) The seedling of all plots of the ordinary seed were very poor compared to the plots of sprouted seed. (2) In case that the variety 'Tongil' was cultivated on the dry nursery bed, the good seedling percentage and the plant height rat io were significantly increased but the other characteristics of the seedling were not noticeable. (3) The kinds of the covering soil had not an effect on the seedling growth significantly. (4) Inside straw mulching was seemed effective for the protection in the case of the extreme high temperature and heavy rain fall, even though there was not significant differences between inside straw mulching and no treatments at the flat type nursery. (5) Difference of seedling growth between the flat type nursery and the tunnel type nursery was not significant. And it's reason was thought that the covering period of polyethylene film was short in semi hot nursery for the common early transplanting cultivation of rice. (6) The percentage of good seedling was higher at 'Akibare' than 'Tongil', variety but the number of seedling leaf and the seedling growth ratio in height were significantly increased in the variety 'Tongil'. The other seedling characters between there two varieties were not significantly different. 2. Results after transplanting This experiment was conducted to study on the ripening percentage, rice yield and disease, appearance of the seedling from sprouted seed plots including common irrigated nursery as check plot after transplantnig. The results obtained are summarized as follows: (1) The rice yield, the yield components and the appearance of leaf discoloration of both varieties, 'Tongil' and 'Akibare' were slightly betterat the plot of the standard tunnel nursery than that of the flat nursery with inside mulching or the among these three plots. (2) For 'Tongil' variety, the ripening percentage and the rice yield were significantly decreased at the common irrigated nursery compared with semi hot nursery. (3) The ripening percentage and the rice yield of 'Akibare' contrasted with 'Tongil' were significantly decreased at thesemi 'hot-nursery compared with common irrigated nursery. The main reason was thought to be the injury of the rice stripe disease (Rice stripe disease virus). Considering above mentioned experimental result, the seedling of 'Tongil' must be cultivated on the semi bot nursery for better ripening percentage as well as rice yield and for prevention of red discoloration. And as a model of semi hot nursery, the polyethylene covering nursery of standard tunnel type is most desirable but that of flat type with inside straw mulching is thought to be desirable too.

• Korean Journal of Medicinal Crop Science
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• v.3 no.2
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• pp.156-164
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• 1995

The study was carried out to elucidate the influenced of shading and mulching with polyethylen vinyl on growth and yield of Cinidium officinale Makino, and improve the cultivation method of those medicinal plants in northern area of Gyeong-buk province, Korea. Top fresh weight of Cinidium officinale Makino was increased by both 35 % and 55% shading compared to the non-shadingand decreased by 75 % shading, but that of Ligusticum chuanxing Hart. Was decreased by the shading tested The summer wilt of Cinidium officinale Makino severely occurred in non-shading but greatly reduced by 55 % or 75 %shading, while no difference was observed in Ligusticum chuanxing Hort, between the shading and the non-shading. Dry root yield Cinidium officinale Makino was increased by 17 % and 19 % in 35 % and 55 % shading levels, respectively, compared to the dry root yield(254kg/10a) in non-shading. However, it was decreased in Ligusticum chuaxing Hort. by the shading. Emergence ratio of Cinidium officinale Makino was increased by black polyethylen vinyl mulch but decreased by transparent polyethylen vinyl mulch, compard to non-mulch. Polyethylen vinyl mulch increa­sed the top fresh weight of Cinidium officinale Makino Especialy black polythylen vinyl mulch was very effective on increasing the top fresh weight. Dry root yield of Cinidium officinale Makino was increased by 32 % and 30 %, respectively, compared to the non-shading.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.61 no.1
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• pp.70-77
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• 2016

The object of this study was to evaluate the effects of climatic elements on potato yield and create a model for estimating the potato yield. We used 35 yield data of Sumi variety produced in mulching cultivation from 17 regions over 11 years. According to the results, some climatic elements showed significant level of correlation coefficient with marketable yield of potato. Totally 22 items of climatic elements appeared to be significant. Especially precipitation for 20 days after planting (Prec_1 & 2), relative humidity during 11~20 days after planting (RH_2), precipitation for 20 days before harvest (Prec_9 & 10), sunshine hours during 50~41 days before harvest (SH_6) and 20 days before harvest (SH_9 & 10), and days of rain during 10 days before harvest (DR_10) were highly significant in quadratic regression analysis. 22 items of predicted yield ($Y_i=aX_i{^2}+bX_i+c$) were induced from the 22 items of climatic elements (step 1). The correlations between the predicted yields and marketable yield were stepwised using SPSS, statistical program, and we selected a model (step 2), in which 4 items of independent variables ($Y_i$) were used. Subsequently the $Y_i$ were replaced with the equation in step 1, $aX_i{^2}+bX_i+c$. Finally we derived the model to predict the marketable yield of potato as below. $$Y=-336{\times}DR_-10^2+854{\times}DR_-10-0.422{\times}Prec_-9^2+43.3{\times}Prec_-9\\-0.0414{\times}RH_-2^2+46.2{\times}RH_-2-0.0102{\times}Prec_-2^2-7.00{\times}Prec_-2-10039$$.

• Korean Journal of Environmental Agriculture
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• v.35 no.3
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• pp.202-210
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• 2016

BACKGROUND: This study was conducted to determine effects of ridging systems and plastic film mulch types on growth, yield, and profitability of potato (Solanum tuberosum L.) in spring cropping using paddy field and to suggest profitable ridging system and plastic mulch type.METHODS AND RESULTS: Two potato cultivars ('Goun', and 'Atlantic') were grown at paddy field located in Gangneung in spring. For treatments, ridging systems were one-row ridge (OR) and two-row ridge (TR). Mulch types were no-mulch (NM), black plastic film mulch (BPM), and transparent plastic film mulch (TPM). Emergence of sprout was affected by the mulch types and the fastest level was shown at TPM treatment. Accumulative soil temperature during sprouting was 16.2℃ higher at TR than at OR and also higher at TPM than at BPM or NM. Stem length was not affected by ridging systems or mulch types. Leaf area index (LAI) was influenced by mulch types, while not by ridging systems. The highest LAI was shown at TR with TPM and OR of BPM. There was no significant difference in specific gravity or dry matter rate by ridging systems and mulch types. Tuber yield was significantly influenced by ridging systems and mulch types. Mean tuber weight was heavier at OR treatment than at TR and also the heaviest at TPM among mulch types. The highest marketable yield was found at OR with BPM. Based on marketable tuber yield and market price, the highest income ratio in two cultivars was found at OR with BPM and it was 20~82% higher than the ratio at TR with TPM.CONCLUSION: In spring potato cropping using paddy field, OR with BPM is better for high yield and is more profitable for farmer's income than the conventional cultivation method, TR with TPM.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.10a
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• pp.83-83
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• 2018

마카(Maca, Lepidium meyenii Walp)는 십자화과 두해살이풀로서 페루의 안데스 산맥이 원산지이며 세계 여러 나라에서 건강기능식품, 음료 등의 가공원료로 이용되고 있다. 최근 마카의 기능성 성분이 밝혀지면서 국내에서도 재배 면적이 증가하고 있으나 연작장해, 동계 저온으로 인한 고사 등으로 인하여 생산량은 매우 저조한 실정이다. 따라서 본 연구에서는 노지 환경에서 비닐피복과 지상부에 비닐 터널을 처리하여 겨울철 고사율을 줄이고 연장장해를 회피하여 마카를 안정적으로 재배하고자 실시하였다. 마카 재배는 경상북도 경산지역에서 2017년 9월 24일 파종하여 2018년 4월 30일에 수확하였으며, 처리는 비닐피복, 비닐피복+터널, 비가림하우스 및 대조구로 노지에서 무피복재배로 실시하였다. 동해에 의한 마카 고사율은 비닐피복과 노지재배에서 55.7, 79.1%였으나 비닐피복+터널과 비가림하우스에서는 3%이하로 조사되어 노지환경에서 비닐피복 후 지상부 터널설치로 동해를 방지할 수 있었다. 수확 시 마카의 생체중은 비가림하우스에서 주당 57.8g으로 가장 높았으며, 비닐피복+터널설치, 비닐피복 및 노지재배에서 각각 52.7, 21.3, 10g으로 조사되어 동계 지상부 15cm 지점의 평균온도(비가림하우스 : $3.4^{\circ}C$, 비닐피복+터널설치 : $1.9^{\circ}C$, 노지 : $-2.1^{\circ}C$)와 정의 상관관계를 나타냈다. 마카의 이용부위인 뿌리의 무게는 비가림하우스와 비닐피복+터널에서 각각 주당 15.5, 19.9g으로 조사되어 비교적 비닐피복+터널처리의 생육이 좋았으나 통계적 유의성은 없었다. 마카는 다닥냉이속 작물로 저온경과 후 뿌리비대가 이루어지는 속성을 가지고 있으나 생육후기 고온으로 인한 지상부 생육은 뿌리비대를 저하시키는 것으로 추정되어 3월 이후 온도관리는 좀 더 연구가 진행되어야 할 것이다. 노지와 비닐피복 재배에서는 뿌리의 무게가 주당 3.9, 2.7g으로 정상적인 수확이 불가능하였다. 마카를 노지에서 재배할 경우 비닐피복 후 지상부에 터널을 설치하면 연작장해 회피와 동해에 의한 고사율을 줄일 수 있어 안정적인 재배가 가능한 것으로 판단되었다.

• Korean Journal of Medicinal Crop Science
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• v.6 no.1
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• pp.51-56
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• 1998

This study was carried out to evaluate environmental and ecological characteristics of natural habitat for cultivation of Epimedium koreanum. Habitat of E. koreanum was the slope foot of mountain descending gradually toward mostly northwest from top of mountain with slope of $2{\sim}20%$ and the altitude ranged from 60 to 400m above the sea level. Some physiochemical characteristics of habitat soil were as follows: pH, $4.1{\sim}5.8$, organic matters content, $4.9{\sim}6.6%$ and cation exchange capacity, $14.8{\sim}34.3\;me/100g$ soil, respectively. Habitats were shaded by deciduous broad-leaved tree mainly, and compared with those of naked area, relative photon flux density was $3.5{\sim}13.1%$ and relative luminance was $3.3{\sim}11.9%$ due to shading. Air temperature of habitat under shade was $4.3{\sim}6.5^{\circ}C$ lower than that of naked area. Habitat soil temperature was lower than that of naked area but temperature range was smaller than that of naked area. E. koreanum plants were growing with semishading plants under shade of tree leaf. From investigation of natural characteristics of habitat, it was concluded that E. koreanum plant would grow at place with a little change in temperature and moisture of soil which was caused by shading and mulching with litterfall of broad-leaved tree.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.15
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• pp.99-113
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• 1974

This experiment was carried out to find reasonable semi. hot seedbed system for early transplanting of "Tongil"rice cultivar. The quality of the young rice-plants, yield, and the occurrence of the reddish dry leaves were not significant differences between the seedbed with polyethylene tunnel and that of Rat covering. The per cent of healthy seedling of the soil preparation with the dry soil plowing was increased than that of the water soil plowing. The stability of the seedling cultivation of the thin layer straw mulching seedbed beneath the polyethylene film was higher than that of the common flat seedbed system.ed system.

• Research in Plant Disease
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• v.28 no.2
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• pp.61-68
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• 2022

Powdery mildew and two-spotted spider mite are detrimental to strawberry plants and are controlled with traditional pesticides. To accommodate consumer demand, eco-friendly methods of pest control are required. Strawberries were cultivated (in soil and in a hydroponic system) for two years, and ultraviolet B (UV-B) irradiation was used as an alternative pest control during the harvesting season. Three varieties were grown (Seolhyang, Kingsberry, and Durihyang), and four UV-B lamp/mulch (black, green, and light reflection sheet [LRS]) combinations were used during harvesting: UV-B+black or green mulch, UV-B+black or green+LRS, no UV-B+black or green, and no UV-B+black or green+LRS. In all varieties, powdery mildew was 65% more controlled when UV-B irradiation was used. The adult two-spotted spider mite density was lowest in the UV-B lamp+black or green+LRS treatments. Therefore, UV-B irradiation during the strawberry harvesting season could effectively control powdery mildew and two-spotted spider mite with little side effect on the plants.

• Korean Journal of Remote Sensing
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• v.37 no.6_1
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• pp.1559-1572
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• 2021

The response of vegetation under the crop stress condition was evaluated using structural, biochemical, and physiological vegetation indices based on unmanned aerial vehicle (UAV) images and field-spectrometer data. A high concentration of herbicide was sprayed at the different growth stages of garlic to process crop stress, the above ground dry matter of garlic at experimental area (EA) decreased about 46.2~84.5% compared to that at control area. The structural vegetation indices clearly responded to these crop damages. Spectral reflectance at near-infrared wavelength consistently decreased at EA. Most biochemical vegetation indices reflected the crop stress conditions, but the meaning of physiological vegetation indices is not clear due to the effect of vinyl mulching. The difference of the decreasing ratio of vegetation indices after the herbicide spray was 2.3% averagely in the case of structural vegetation indices and 1.3~4.1% in the case of normalization-based vegetation indices. These results meant that appropriate vegetation indices should be utilized depending on the types of crop stress and the cultivation environment and the normalization-based vegetation indices measured from the different spatial scale has the minimized difference.