• Proceedings of the Korean Society of Crop Science Conference
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• 2020.06a
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• pp.41-41
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• 2020

• Proceedings of the Korean Society of Crop Science Conference
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• 2020.11a
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• pp.48-48
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• 2020

• Proceedings of the Korean Society of Crop Science Conference
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• 2020.06a
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• pp.178-178
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• 2020

• Proceedings of the Korean Society of Crop Science Conference
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• 2022.04a
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• pp.138-138
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• 2022

• Journal of Bio-Environment Control
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• v.21 no.2
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• pp.95-101
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• 2012

This study was conducted to investigate the effect of climate conditions during cultivation and harvesting on the quality and storability of fresh bulb cabbage (Brassica oleracea L. var. capitata). Plug seedlings of six cabbage cultivars were transplanted to Gangneung-Wonju University high elevation research station in Gangwon province (780 m above sea level, lat. $37.5^{\circ}N$.) and harvested with four different harvest times like August 3 ($1^{st}$), August 13 ($2^{nd}$), August 23 ($3^{rd}$), and September 10 ($4^{th}$), respectively from 50 days after transplanting. Weight loss, Hunter color factors, firmness, and soluble solids content (SSC) of the cabbage bulbs were investigated during storage at $3^{\circ}C$ (85% RH) and $25^{\circ}C$ (60% RH). Decreased bulb weight and poor quality cabbages were apparent at the late transplanting (July 14) and harvest (September 10) respectively. Quality index such as firmness and SSC at August 23 ($3^{rd}$) harvested cabbage was better than August 3 ($1^{st}$) and August 13 ($2^{nd}$) cabbages due to the good weather condition just before harvesting. The cv. 'Speed king' and 'Minix 40' showed good qualities among the cultivars, especially when the bulbs were harvested during sunny day conditions from one week before harvesting. Also SSC was influenced by weather condition before harvesting rather than transplanting date, while firmness was influenced by transplanting and harvest date. However, the differences among the cultivars were not significant. The potential of storage as maintaining the quality was different, depending on weather conditions at harvest time. Generally the storage periods of six cultivars were around 3~5 days and 9~10 days at room and low temperature, respectively. However, the August 3 ($1^{st}$) harvested cabbage lost their marketable quality very fast because of rainy and cloudy weather condition before harvesting and also storability of bulbs was 2 days and 4 days at room temperature and $3^{\circ}C$, respectively. Quality index was also not significant difference among cultivars.

• Korean Journal of Medicinal Crop Science
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• v.1 no.2
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• pp.115-119
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• 1993

This study was carried out to determine optimum harvest time of in vitro multiplied tuber Pinellia ternata(Thunb.)Breit from 1990 to 1992. Tuber yield and its related traits were observed with four harvest times. Plant height was 7.2cm at 6 months and 19.3cm at 24 months after planting. The number of tubers per unit area was significantly increased with the passage of growing time after planting$(78\;tubers/m^2)$, those were increased by 2.3 times in 6 months, 5.6 times in 12 months, 13.3 times in 18 months and 20.0 times in 24 months. The tuber sizes(length, width and weight) were highly enlarged during 12 to 18 months after planting compared with before or after this time. There were smaller tubers and lower tuber yields with shorter growing period, while large tubers above 7.1mm and higher yields with longer growing. It was suggested that the optimum harvest time was 18 months after planting, before over wintering rather than next year of spring, 24months after planting.

• Journal of The Korean Society of Grassland and Forage Science
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• v.26 no.2
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• pp.97-104
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• 2006

This experiment was carried out to determine the effect of harvesting date on the forage yield and quality of different rye (Secale cereale L.) cultivars. The experiment was conducted in split plot design with three replications. The main plots consisted of two harvesting dates 20th and 30th April. The subplots consisted of five rye cultivars from different maturity groups such as 'Kodiak (Late)'. 'Koolgrazer (Early)', 'Danko (Late)', 'Homil22 (Medium)' and 'Olhomil (Early)' Dry matter (DM) contents of 17.8% at early harvesting were lower 2.2% than at late harvesting. But crude protein (CP) of 18.9% and total digestible nutrients (TDN) contents of 65.5% at early harvesting were higher 2.3% and 3.0% than those at late harvesting, respectively. There were significant differences in DM, CP and TDN contents among the rye cultivars tested (p<0.05). The contents of fiber components at early harvesting were lower than those at late harvesting. The acid detergent fiber (ADF), neutral detergent fiber (NDF), cellulose and acid detergent lignin (ADL) contents at early harvesting were lower than those at late harvesting, and hemicellulose contents at early harvesting was higher than that at late harvesting. The fiber component of early maturing cultivars such as 'Koolgrazer' and 'Olhomil' were higher than those of the others. Dry matter, CP, in vitro digestible dry matter (IVDDM) and TDN yields at early harvesting were lower than those at late harvesting, and the yield of early maturing cultivars were higher than those of the others. In this study, the results of this study indicate that forage production technology in combination with early maturing rye cultivar and late harvesting could enhance both production and quality of rye.

• Korean Journal of Agricultural and Forest Meteorology
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• v.23 no.4
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• pp.405-414
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• 2021

This study predicted waxy corn harvest date in South Korea using 30-year (1991-2020) hindcasts (1-6 month lead) produced by the Pusan National University Coupled General Circulation Model (PNU CGCM)-Weather Research and Forecasting (WRF) chain. To estimate corn harvest date, the cumulative temperature is used, which accumulated the daily observed and predicted temperatures from the seeding date (5 April) to the reference temperature (1,650~2,200℃) for harvest. In terms of the mean air temperature, the hindcasts with a bias correction (20.2℃) tends to have a cold bias of about 0.1℃ for the 6 months (April to September) compared to the observation (20.3℃). The harvest date derived from bias-corrected hindcasts (DOY 187~210) well simulates one from observation (DOY 188~211), despite a slight margin of 1.1~1.3 days. The study shows the possibility of obtaining the gridded (5 km) daily temperature and corn harvest date information based on the cumulative temperature in advance for all regions of South Korea.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.55-55
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• 2017

본 연구는 파프리카를 자동 수확하기 위한 시스템 개발의 일환으로 수확작업기의 절단장치를 설계하고자 파프리카 과병의 절단특성을 분석하고자 하였다. 파프리카 과병의 절단특성을 분석하기 위하여 사용한 파프리카는 경기도 평택시에서 재배된 파프리카를 사용하였다. 적색 품종인 Nagano RZ와 황색 품종인 Helsinki, 주황색 품종인 Boogie를 사용하였다. 파프리카 과병의 절단 특성을 분석하기 위하여 상기 세 가지 품종의 파프리카 30개씩 총 90개의 파프리카를 사용하여 과병의 중앙 지점을 절단하였다. 절단 특성을 측정하기 위하여 push-pull gauge인 digitect dtg-20을 사용하였으며, 파프리카의 과병의 절단 특성을 측정하기 위하여 일반 농가에서 사용하는 접도 OLFA CK2의 접도의 칼날을 digitect dtg-20에 장착하여 측정하였다. 파프리카 과병의 절단 특성의 시험 항목은 절단강도를 측정하였다. 파프리카의 과병의 절단 특성 측정은 수확작업기의 파프리카 과병의 절단을 위한 절단장치의 설계를 위하여 진행하였다. 파프리카 과병의 절단 특성은 파프리카의 훼손을 최소화한 수확작업을 위한 중요한 요소이다. 파프리카의 과병의 중앙을 절단하여 절단강도와 절단력을 측정하였다. 그 결과 파프리카 과병의 절단강도는 $4.18{\pm}1.18kgf$로 나타났으며, 최대값은 6.91kgf, 최소값은 2.26kgf로 나타났다. 파프리카 과병은 측정된 절단강도의 최대값인 6.91kgf보다 큰 힘을 이용하여 절단하여야 하므로 그에 맞게 수확작업기의 절단장치의 모터를 선정하고 설계가 이루어져야 한다고 판단한다.

• Journal of Bio-Environment Control
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• v.8 no.3
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• pp.164-171
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• 1999

Tomato yield and harvest date were analyzed to examine the productivity of Single Truss Tomato Production System(STTPS) for four regions in Korea. It was found that the solar radiation was not sufficient to get the maximum tomato yield during the low light seasons. The difference of total annual yield between Suwon and Jinju regions was about 12kg.m$^{-2}$ . These results indicate that supplemental lights are needed to increase the yield. The availability of natural light should be considered in deciding the locations of tomato greenhouses. The harvest date could be adjusted by using supplemental lighting. The development and implementation of the lighting control strategies are required for reducing electricity expense.