• Proceedings of the Korean Society for Agricultural Machinery Conference
• /
• 2002.02a
• /
• pp.230-235
• /
• 2002

엽채류 양액재배용 정식판으로 사용되는 발포스틸로폼을 작기가 끝난 후에 세척할 수 있는 브러시와 물분사방식의 평면 세척기를 제작하여 시험한 결과는 다음과 같다. 가. 정식판을 세척기내로 이송하는 속도에 따라 세칙정도를 측정한 결과, 이송단수 1단 0.15m/s에서 진행저하율이 낮았으며 2단이상에서 진행저하율이 35~40%로 매우 크게 나타났으며, 이대의 명도값은 각각 79~80으로 세척전보다 42~44정도 증가한 것으로 나타났다. 나. 횡브러시 회전속도별 정식판의 이송속도와 진행저하율은 1010rpm에서 17%로 매우 큰 것으로 나타났으나, 이때의 세척정도는 세척전후 명도차가 44.1로 매우 크게 나타났다. 다. 물공급량별 정식판의 이송속도와 진행저하율은 물공급량 80$\ell$/min일 때 11.6%로 가장 적었으며, 세척전후의 명도차도 44.4로 크게 나타났다. 라. 정식판의 세척전후 명도는 대체로 세척전 명도값이 34~40이던 것이 세척후 명도값이 59~81로 크게 개선된 것으로 나타났다. 마. 이상과 같은 결과로부터 정식판 이송속도 0.17m/s, 횡브러시 회전속도 1010rpm, 물분무량 80$\ell$/mim으로 성능 시험한 결과, 300평용을 세척하는데 2.8시간으로 인력보다 20배 능률적으로 나타나 세척기의 사용이 노동력 절감에 크게 기여하는 것으로 판단된다.

• Journal of agriculture & life science
• /
• v.51 no.1
• /
• pp.187-192
• /
• 2017

In various crops, seedlings are preferred to seeds for faster and more effective growth, so transplanters are used for them. This 2-row transplanter was developed to promote the mechanization of vegetable transplanting work which depends on human power. and it can automatically supply seedling tray and transport picked up seedling to the planting hopper. Also, we judged performance of transplanter with comparing seedling missing plant ration according to two types of pick-up method. Result of experiment, in finger-type picking up of 265 seedlings, missing plant ratio was 13.7% with 17 failures of pick-up and 15 collapse of bed soil. and In fork-type picking up of 200 seedlings, failure of pick-up was not appeared and missing plant ratio was low as 4% with 6 dropped during transfer. Therefore for 2-row automatic transplanter, fork-type pick-up device was found to be compatible.

• Journal of agriculture & life science
• /
• v.53 no.4
• /
• pp.113-124
• /
• 2019

In this study, the operational characteristics of a cam-type vegetable transplanter which usually used in domestic was analyzed and operating mechanism of a transplanting device was analyzed. The main components and power path of the transplanter were analyzed. The maximum and minimum control cycles according to the moving speed and the plant spacing were analyzed. 3D modeling and simulation were performed to derive the trajectory of the bottom end of the transplanting hopper and the plant spacing at the each operating condition. The simulation results were verified by the field tests. As main findings of this study, the transplanting device has one degree of freedom (DOF) which consist of 13 links, 17 rotating joints and 1 half joint, and each part has composite structure with cam and links. By continuous and repetitive motion of the structures of transplanting device, the transplanting hopper plants the seedling in the ground with a vertical direction, and the seedling was planted stably. The power is transmitted to the driving part and transplanting device from the engine, and the maximum and minimum plant spacing of the transplanting device were about 900 mm and 350 mm, respectively.

• Korean Journal of Agricultural and Forest Meteorology
• /
• v.18 no.4
• /
• pp.298-306
• /
• 2016

Planting date shift is one of the means of adapting to climate change in Kimchi Cabbage growers in major production areas in Korea. This study suggests a method to estimate the potential yield of Kimchi Cabbage based on daily temperature accumulation during the growth period from planting to maturity which is determined by a plant phenology model tuned to Kimchi Cabbage. The phenology model converts any changes in the thermal condition caused by the planting date shift into the heat unit accumulation during the growth period, which can be calculated from daily temperatures. The physiological maturity is estimated by applying this model to a variable development rate function depending either on growth or heading stage. The cabbage yield prediction model (Ahn et al., 2014) calculates the potential yield of summer cabbage by accumulating daily heat units for the growth period. We combined these two models and applied to the 1km resolution climate scenario (2000-2100) based on RCP8.5 for South Korea. Potential yields in the current normal year (2001-2010) and the future normal year (2011-2040, 2041-2070, and 2071-2100) were estimated for each grid cell with the planting dates of July 1, August 1, September 1, and October 1. Based on the results, we divided the whole South Korea into 810 watersheds, and devised a three - dimensional evaluation chart of the time - space - yield that enables the user to easily find the optimal planting date for a given watershed. This method is expected to be useful not only for exploring future new cultivation sites but also for developing cropping systems capable of adaptation to climate change without changing varieties in existing production areas.

• Proceedings of the Korean Society for Agricultural Machinery Conference
• /
• 2017.04a
• /
• pp.66-66
• /
• 2017

국내 농촌의 인구고령화, 여성화 증가로 인한 농촌노동력 감소 문제를 해결하기 위해 농업기계자동화에 관한 연구가 활발히 진행되고 있다. 본 연구는 자동화농업기계 중 자동 이식기의 성능평가 기술을 개발하기 위해 수행되었으며 이를 위해 자동 정식기의 핵심부품인 이식호퍼의 결주율, 이식율, 주간간격, 운동궤적 등을 측정할 수 있는 원형토조 실험장치를 개발하였다. 원형토조 실험장치는 원형토조, 이식호퍼 구동장치, 컨트롤러로 구성되어 있으며 이식호퍼의 회전속도(rpm)를 조절하여 주간간격을 조절할 수 있고 초고속 카메라를 이용하여 이식호퍼의 운동궤적을 측정할 수 있다. 이식작물로 고추, 양배추, 브로콜리의 3종류의 육묘를 이용하여 이식호퍼의 회전속도를 20~60 rpm 구간에서 10 rpm 단위로 속도조건변화를 주고 결주율과 이식율을 측정하였다. 이식호퍼 rpm 속도에 따른 주간거리는 190~560 mm로 나타났다. 각 rpm 단수, 작물별 평균 이식율은 고추육묘가 약 97%, 양배추육묘가 약 94%, 브로콜리육묘가 약 95%로 나타났다. 또한 초고속 카메라를 이용하여 측정한 이식호퍼의 운동궤적을 통해 선진사 제품과 대비하여 차이를 보인 것을 확인하였다. 향후 원형토조 실험장치를 이용해 다양한 작물 및 토양조건에서의 실험 및 토양저항 측정장치 개발을 통해 이식작업 진행중에 호퍼에 걸리는 부하에 대한 성능평가시험을 할 계획이다.

• Research in Plant Disease
• /
• v.10 no.1
• /
• pp.48-52
• /
• 2004

We investigated the effect of infection time of CGMMV on the growth and quality of watermelon and cucumber plants. The effect (damages by CGMMV) was estimated on the watermelon where CGMMV had been inoculated at different growth stages, vegetative (transplanting stage, vegetative growth stage) and reproductive growth stage (fruiting stage and fruit hypertrophy stage). In the case of cucumber, CGMMV was inoculated at transplanting stage and Erst flowering stage, respectively. When watermelon was infected with CGMMV at vegetative growth stage, vine length, internode length, leaf area, and fruit weight of the plants largely decreased compared with control plants, while the infected plant growth was not very different from control plants when it was infected at reproductive growth stage. Brix of the fruit of watermelon also decreased when the plants was infected with the virus earlier than fruiting stage. The occurrence of 'Pisubag', internal discoloration and decomposition of watermelon fruits, tended to be increased as earlier infection time with CGMMV In the case of cucumber infection time with CGMMV did not influence earlier growth of the plants, but did later growth showing that plant height, vine length, internode length, number of leaf, leaf wide, and leaf length of the plants decreased as infection time became to be earlier.

• Proceedings of the Korean Society of Crop Science Conference
• /
• 1977.05a
• /
• pp.27.2-28
• /
• 1977

• 농업기술회보
• /
• v.47 no.4
• /
• pp.38-40
• /
• 2010

파종, 정식, 잡초 뽑기, 물주기, 비료주기, 온도관리, 병해충 방제 수확 등 작물을 파종하고 수확하기까지는 수백 번의 손길과 정성이 필요하다. 정식이 끝난 고추, 오이, 수박 등 주요 과채류의 장마철 농작물 관리요령 등 중점적으로 실천해야 할 재배기술에 대해서 알아보자.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.22 no.1
• /
• pp.20-25
• /
• 1977

In order to find out the effect of five kinds of cultural treatments in fall crop production of potatoes the experiments were carried out with Simabara cultivar at Chonan in 1976. Sprouting of dormant seed pieces were induced by soaking in 2ppm GA and 250ppm Ethrel mixed solution for 60 minutes. Seed pieces with longer sprouts at transplanting, and increasing of urea(nitrogen) application from 10 to 30 Kg per 10a resulted better growth, yields, and quality. Application of total nitrogen at one time on 24th July(transplanting date) resulted lower emergence, yields, growth, and quality as compared with divided application on 24th July and 15th August and 5th September. Higher transplanting than 60$\times$20cm or 70$\times$17cm resulted slender growth and lower yields. Deeper mulch with wheat straw (from 4 to 12cm) induced lower maximal earth temperature in summer and higher minimal earth temperature in autumn.

• Journal of agriculture & life science
• /
• v.52 no.6
• /
• pp.127-138
• /
• 2018

In this study, the operational characteristics of a domestic vegetable transplanter were investigated. The main functional components and power path of the tranplanter were analyzed. The link structure of transplanting device waskinematically analyzed, and 3D modeling and dynamic simulation were performed. Based on this analysis, the trajectory of the bottom end of the transplanting hopper was analyzed. Also, the plant spacing according to the engine speed and the shifting stage of transplanting transmission was analyzed and verified by field test. As main results of this study, the transplanting device is one degree of freedom(DOF) 4-bar link type mechanism which comprises 10 links and 13 rotating joints. The transplanting hopper plants seedlings in a vertical direction while maintaining a constant posture by the links of transplanting device. The power is transmitted to both the driving part and transplanting part from the engine, and the maximum and minimum plant spacing of the transplanting device were 428.97 mm and 261.20 mm.