• 한국식품영양과학회지
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• 제24권6호
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• pp.1016-1019
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• 1995

This study was conducted to investigate the nutrient composition of hydroponic water dropwort and the effect of blanching condition on ascorbic acid content. Nutrient composition of hydroponic water dropwort of mid harvest on the 30th day was measured in three portions of leaves, petioles and stems, and was compared with that of late harvest on the 40th day. Hydroponic water dropwort was obtained from the Department of Horticultural Science, Seoul National University. The results were as follows. The nutrients content of leaves were significantly higher in ash and ascorbic acid and lower in moisture, crude fat and crude fiber than those of stems and petioles. There was no significant difference in total vitamin A and thiamin contents between three portions. Ascorbic acid content of leaves harvested on the 30th day was the highest, 57mg/100g, and decreased to 18mg/100g in the leaves harvested on the 40th day. Marked increase in crude fiber and vitamin A content of leaves was observed in late harvest may be due to the maturation. The results of nutrient composition analysis suggest that the leaves of hydroponic water dropwort is important in ascorbic acid and ash. It is recommended that shorter blanching time and addition of 0.5% NaCl to the blanching water are better for higher ascorbic acid retention of hydroponic water dropwort. In conclusion, as hydroponic water dropwort has high content in ash, calcium, vitamin and free sugar with alkalinity, leaves as well as stems and petioles can be recommonded as a vegetable of high nutritional quality.

• 동아시아식생활학회지
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• 제19권4호
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• pp.570-578
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• 2009

채취시기가 다른 6종의 녹차를 시료로 택하여 실제 음용 조건으로 추출하여 일반 성분, 카페인 및 총 페놀 함량을 분석하였고, 전자공여능에 의한 항산화 활성, ACE 저해도, SOD 유사 활성, Tyrosinase 저해율, 아질산염 소거능 및 항균 활성을 조사하였다. 그 결과 일반 성분과 카페인의 경우 채취시기가 빠른 것일수록 총질소 및 카페인 함량이 높게 나타났다. 반면, 총페놀, 전자공여능, ACE 저해율, SOD 유사활성은 아질산염 소거능의 경우 채취시기에 따라서 크게 차이를 나타내지 않았으나, Tyrosinase 저해율의 경우 채취시기가 늦어질수록 약간 증가하는 경향을 나타내었다. 항균 활성의 경우 일로를 제외한 5종의 시료의 경우 항균성을 나타내는 것을 확인하였다.

• 농업과학연구
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• 제45권3호
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• pp.355-363
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• 2018

This study was conducted to investigate suitable rice cultivars for various rice based cropping systems in a paddy field in the Yeongnam plain area. Thirteen rice cultivars (5 early, 3 medium and 5 mid-late maturing cultivars) and three transplanting dates (June 5, June 25 and July 5) were evaluated in this study. The mid-late and early maturing cultivars for the July 5 and June 25 transplanting headed before August 30 which is the safe heading date in the Yeongnam plain area, ranging from Aug. 26 - 28 and Aug. 18 - 23, respectively. The safe harvest time of rice for double and triple cropping systems should be before the middle of October for the cultivation of the succeeding winter crops. The rice yield was the highest for the June 5 transplanting regardless of the rice cultivars, and it gradually decreased as the transplanting date was delayed from June 5 to July 5 due to a decrease in the spikelet numbers per panicle number and in the ripened grain rate. In contrast, the other yield parameters that include the panicle number per $m^2$, the 1,000-brown rice weight, and the ripened grain ratio were not significantly affected. The result indicates that based on the milled rice, heading time and harvest time, a medium maturing cultivar (Haiami and Samdeog) would be applicable to a winter barley/wheat, garlic/onion-summer rice double cropping, while a mid-late cultivar (Saeilmi, Saenuri and Hyunpoom) would be suitable for a spring potato/waxy corn-summer rice double cropping in the Yeongnam plain area. On the other hand, an early maturing cultivar (Unkwang, Jokwang and Haedamssal) would be preferable for a triple cropping because of the short growth period of rice.

• 한국초지조사료학회지
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• 제32권4호
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• pp.353-360
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• 2012

This study was conducted to evaluate the nutritive value and the quality of ensiled kenaf after fermentation with three cultivars at three different times of harvesting. Experimental plot were allocated with three harvest date (Early;8/3, medium;8/15 and late;8/28) and three cultivars (Tainung-a, Everglade, Whitten). The DM (dry matter) yield increased with maturity in all three cultivars, especially in Whitten which showed the highest yield at each harvest time. The DM content in Whitten at late harvesting time was higher than other treatments (231 g $kg^{-1}$ DM). The CP (crude protein) contents of the kenaf silage of all three cultivars ranged from 151 to 164 g $kg^{-1}$. Highest content of NDF (neutral detergent fiber) was observed in Everglade at medium harvesting date, but the ADF (acid detergent fiber) content was highest in Everglade at early harvesting date (p<0.05). All treatments produced a pH less than 4.0, which is sufficient for stable storage. The pH of Tainung-a was higher than other cultivars at all harvesting times (p<0.05). Whitten showed the higher content of lactic acid (25.8 g $kg^{-1}$ DM) showed at early harvesting date than other cultivars (p<0.05), while the acetic acid content (21.1 g $kg^{-1}$ DM) was higher in Tainung-a at medium harvesting date (p<0.05). No significant difference was observed in ammonia-Nand butyric acid concentrations among all treatments. These results indicate that a kenaf silage could be used as fodder for ruminants. Especially, the Whitten harvested at late growing stage showed promise as a forage silage crop under Koran environments.

• 한국작물학회지
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• 제61권2호
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• pp.104-112
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• 2016

A double-cropping system with soybean (Glycine max) following the cultivation of potato, garlic, and onion is widely adopted in the southern region of Korea. For this system, marginal dates for planting must be determined for profitable soybean yields, because the decision to plant soybean as a second crop is occasionally delayed by harvest of the first crop and weather conditions. In order to investigate the effect of planting date on soybean yield, three cultivars (early and late maturity) were planted on seven different dates from May 1 to July 30 in both paddy and upland fields across 2012 and 2013. Soybean yields were significantly different among the planting dates and the cultivars; however, the interaction between cultivar and planting date was not significant. Based on linear regression, the maximum yield of soybean was reached with a June 10 planting date, with a sharp decline in yield for crops planted after this date. The results of this study were consistent with those of a previous one that recommends early and mid-June as the optimum planting period. Regardless of soybean ecotype, a reduction in yield of greater than 20% occurred when soybean was planted after mid-July. Frost during soybean growth can reduce yields, and the late maturity cultivars planted on July 30 were damaged by frost before completing maturation and harvest; however, early maturity cultivars were safely harvested. For sufficient time to develop and reach profitable yields, the planting of soybean before mid-July is recommended.

• Applied Biological Chemistry
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• 제41권2호
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• pp.141-146
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• 1998

조생온주의 적정 수확시기를 결정하기 위하여 선과장에서 수집한 시료와 감귤나무에서 시기별로 직접 수확한 시료의 이화학적 품질을 분석하였다. 궁천조생과 흥진조생 모두 10월 중순까지 감귤의 비대가 계속 일어났으며, 이후에도 당도는 계속하여 증가하였다. 나무에 달려 있는 위치에 따라서도 감귤의 크기가 다른 경향을 보였으며, 남쪽 방향의 중간 위치에 달려 있는 감귤이 품질면에서 비교적 우수한 것으로 나타났다. 감귤의 품질에 관여하는 가용성고형물, 경도, 총당, pH, 착색도 등을 종합적으로 볼 때 흥진조생의 경우 11월 하순에, 그리고 궁천조생의 경우 12월 초순에 수확하는 것이 품질면에서 좋을 것으로 보였다. 선과장에서 수집한 시료는 농가에서 관행수확시에 수확한 다음 상온저장 후에 시기별로 출하하기 때문에 정확한 수확시기를 결정하는데는 미흡한 것으로 여겨졌다.

• 원예과학기술지
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• 제28권6호
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• pp.959-963
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• 2010

본 연구는 주아의 적정 파종시기를 구명하고자 수행되었다. 주아를 파종할 때 파종시기에 따른 수량을 살펴본 결과 중부 지역에서 추파한 경우 '단양마늘'의 평균 구 무게가 3.1-3.5g이었고 수확주 율은 61-71%였고 춘파의 경우 평균 구 무게가 1.8-2.8g이었고 수확주 율은 53-60%로 주아를 추파한 경우 수량이 높음을 알 수 있었고 적정 파종시기는 10월 초순이었다. 남부지역에서 '남도마늘'의 경우 평균 구 무게가 1.8-3.0g이었고 수확주 율은 74-89%였고 춘파의 경우 평균 구 무게가 0.6-1.0g이었고 수확주 율은 47-56%로 주아를 추파한 경우 수량이 높음을 알 수 있었고 적정 파종시기는 9월 중하순이었다.

• 농업과학연구
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• 제43권3호
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• pp.330-339
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• 2016

The effect of transplanting and harvest timing was evaluated for the production of high quality pigmented rice in the Yeongnam plain area. Rice was transplanted on June $2^{nd}$ and $14^{th}$ and harvested between 35 - 55 days after panicle heading at 5 - day intervals. Three black- and 3 red-pigmented rice cultivars (such as early cultivar : Josengheugchal, Jeogjinju; medium cultivar : Heugseol, Hongjinju; and mid-late cultivar : Sintoheugmi, Geongganghongmi) were studied. Yield components like spikelet number, ripened grain ratio, and 1,000 - grain weight of the black- and red-pigmented rice cultivars were similar for both the June 2 and June 14 transplantings but panicle number per $m^2$ was higher for the June 14 transplanting than for June 2. This contributed to a higher brown rice yield for the June 14 transplanting, by 6 - 19% for black-pigmented rice, and by 10 - 21% for red-pigmented rice than the yield for the June 2 transplanting. Total anthocyanin and polyphenol productions of the pigmented rice were also higher in the June 14 transplanting than that in the June 2 transplanting due to high brown rice yield. Based on the combined pigmented brown rice yield, we concluded that the optimal harvest timing would be 40 - 45 days after panicle heading (DAH) for the black-pigmented rice and 45 - 50 DAH for the red-pigmented rice. This study suggests that optimum transplanting and harvest timings play an important role for production of high quality pigmented rice in the Yeongnam plain area.

• Journal of Forest and Environmental Science
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• 제38권4호
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• pp.256-262
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• 2022

The timing of seed harvesting is an important decision in the management of seed orchards because it affects seed quality and yield. To investigate the effect of cone harvest time on seed quality and determine the optimal harvesting time, cones were regularly collected in seven times and germination tests were performed at each harvest time in two clonal seed orchards of Chamaecyparis obtusa. As cones developed, the percentage of seed germination increased before cone moisture content began to decrease significantly. The moisture contents of cones were highest at the first collection as 68.3% and 67.3% in Jeju and Gochang seed orchards respectively. At this time, germination speed was slowest, indicating poor seed vigour. The highest germination was found at the second stage in Jeju (36.5%) and at the seventh stage in Gochang (28.6%) seed orchard. The germination speed increased as cone moisture content decreased. Additionally, changes of seed vigour differed among the developmental stages in both seed orchards. Consequently, the optimal cone harvest time of C. obtusa seed orchards in Jeju was early September when high germination percentage was obtained. In Gochang seed orchards, late October was optimal cone harvest time when the germination speed was fast and the cone moisture content decreased.

• 한국잠사곤충학회지
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• 제31권1호
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• pp.12-19
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• 1989

추기 된서리로 인한 자연낙엽에 관계없이 상묘를 굴취할 수 있도록 하기 위하여 1985년부터 2년간 전국 각도 9개 지역에서 9월 30일부터 11월 20일까지 10일 간격으로 6회에 걸쳐 굴취하여 묘질을 분석한 결과 다음과 같았다. 1. 묘목의 굵기는 10월 30일까지 다소의 증가를 보였다. 2. 조기굴취는 그루당 새순의 수와 길이를 떨어뜨렸으며, 10월 30일 굴취구에서 생육이 가장 양호하였다. 3. 10월 20일 이후는 자연낙엽에 관계없이 굴취하여도 활착율과 생육에 영향을 주지 않았다. 4. 굴취시기를 늦을수록 체내에 전실소와 P함량이 증가되는 반면 K는 감소하였으며 Ca는 일정하지 않았다. 5. 전실소, P, Ca 등은 뿌리껍질에서 보다 줄기껍질에 함량이 높았으며 K는 일정하지 않았다.