In robotic harvesting, a gripper to manipulate the fruits needs to be attached to the robot system. We proposed a flexible robot gripper that can actively respond to the shape of an object such as fruits in the previous work. However, we found that there is a possibility of not being reliably gripped when the object slides during contact with a finger. In this paper, the improved gripper design is proposed to fundamentally solve the problems of the previous gripper. The position of the finger and the maximum closed position are changed, and the design improvement is performed to increase the grip stability by changing the installation angle of the link portion of the finger. Based on the improved design, a modified gripper is fabricated by 3-D printing, and then gripping experiments are performed on spherical object and fruit model object. It is shown that the gripper can stably grip the objects without excessive bending of the finger link of the gripper. The contact pressure between the finger and the surface of the object is measured, and it is verified that it is a sufficiently small pressure that does not cause damage to the fruit. Therefore, the proposed gripper is expected to be successfully applied in harvesting.

This study was carried out to investigate the effect of legume cover crop culture on earthworm fauna in organic farmland. We compared sod culture with two kinds of legume crops of hairy vetch and crimson clover on organic citrus orchard to natural sod culture and conventional orchards in Jeju Island. We analyzed the soil characteristics and investigated the density of earthworms from the orchards. Organic matter content did not show much difference in soil analysis between organic and conventional orchard. But the biomass of earthworms in organic orchards is 3.8 times to 7.0 times higher than that in conventional cultivated orchards, and individuals of earthworms on organic orchards were 2.3~18 times higher than conventional orchards. The biomass of earthworms on hairy vetch and crimson clover cultivation was 44.8 g, 47.2 g in 2016, and 78.7 g, 31.8 g in 2017, respectively, which were higher than 32.8 g and 9.5 g of those on natural sod cultivation. Through this study, we found that hairy vetch and crimson clover cultivation improve the earthworm occurrence density in the soil on organic citrus orchard.

본 연구는 국내 단감 유기재배 선도농가의 병해충 방제 실태조사, 주요 병해충에 대한 친환경 방제자재 선발, 수립한 방제시스템의 현장실증시험을 2013년부터 2015년까지 3년 동안 수행하였다. 유기재배 선도농가의 주 재배품종은 부유였으며, 병해충 방제를 연간 9~17회 유기농업 자재를 살포하였다. 피해가 가장 심한 병해충은 탄저병, 노린재, 감꼭지나방, 깍지벌레 등 이었으며, 사용한 방제자재는 결정석회황합제, 황토유황, 유화제, 보르도액 그리고 마늘, 은 행, 소나무를 이용한 자가제조 식물추출물제를 이용하였다. 탄저병 방제에 효율적인 자재 는 결정석회황, 황토유황이었고, 마늘유+ 시트로넬라유제, 고삼종자 추출물+차추출물제가 톱다리개미허리노린재와 독나방에 효과적이었다. 감꼭지나방 교미교란트랩을 60개/10a 설 치하면 감 착과율을 30% 향상시켰다. 유기재배 단감에 연간 10회 방제하는 방제시스템의 현장실증시험 결과 70.7%의 과일을 수확할 수 있었다. 그러나, 수확기 즈음인 9월, 10월에는 약제를 살포할 수 없기 때문에 이 때 가해하는 노린재류의 피해는 감소하지 않았으며, 추가적인 연구가 필요하다.

The experiment of grape leafroller (Herpetogramma luctuosalis) was carried out at Okcheon area from 2007 to 2009 and 2015. The grape leafroller had been occurred at a campbell early’ organic vineyard in Okcheon. It’s larva was rolling the leaf of grape and ate the leaf. So the leaf of grape decreased. In organic vineyards, adult grape leafroller’ generation rate per year showed the first peak in mid-June, the second peak in early –August and the third in mid-September. The larva showed the first peak in early July and the second peak in late August-early September. The grape leaf roller had three generations per year. And it took 60.9±1.09 days from egg to adult in growth chamber (VS-91G09M-1300) which the relative humidity conditions was 60±10%, temperature 25±2℃ and photoperiod 16L:8D (The egg : 12±0 days, larvae : 22.2±0.22 days, pupa : 10.6±0.75 days and adult : 16.1±0.45 days). It was conducted to find out the effect of microbial pesticide treatments to control H. luctuosalis. The 4 microbial pesticides (Bacillus thurigiensis) were treated twice on the grape leaves in June 11 and 21 at an organic vineyard in Okcheon. On 10 days after last treatment, the control value of all microbial pesticides were more than 95%. When the dates of spraying to the grape leaves were on May 22, June 12 and July 2 each, the effects of microbial pesticide were 73.9%, 93.5% and 43.6% respectively. As a result, it was effective that Bt was sprayed to grape leaves on mid and late June for controling the H. luctuosalis in organic vineyard. And microbial pesticide Bt was thought to be useful to control the grape leafroller in organic vineyard.

This study analyzes an economic efficiencies of apples, pears, and grapes farming. We evaluate an annual economic overall efficiency (OE), allocative efficiency (AE), technology efficiency (TE), pure technology efficiency (PTE), and scale efficiency (SE) using data envelopment analysis (DEA). We also measure returns to scale of farms, and the change of technical efficiency of frontier farms. Lastly we estimate the effects of some explanatory variables on allocative, pure technical, and scale efficiencies.

과수작물은 국내 농업총생산액의 8.3%정도를 차지하는 주요 작목으로 목본성, 영년생 식물에 해당하며 열매가 재배의 최종산물이다. 영년생 식물의 특성 상 종자의 발아에서부터 개화까지 길게는 10년 이상의 기간이 소요되어 세대진전이 늦기 때문에 교배 후 후대의 전개와 조사가 어렵다. 또한 많은 경우 자가불화성과 교배불친화성이 존재하기 때문에 유전형이 이형접합상태이므로 유전특성을 분석하고 이해하는데 어려움이 크다. 따라서 유전현상에 대한 이해도가 낮아 효율적이고 정밀한 품종육성에 큰 제한이 되고 있다. 최근 NGS 기반의 대량 유전정보의 활용기술은 과수작물에서도 유전현상 이해의 어려움을 극복할 수 있는 새로운 기술로 각광 받고 있다. 대규모 과수작물의 유전체 육종 연구가 미국, 유럽 등 선진국을 중심으로 추진 중이지만 아직까지 초본성 작물에 비해 시작단계에 불과하므로 아직까지 기술적 수준 차가 크지 않아 연구와 기술개발의 경쟁력이 있다고 할 수 있다. 국내에서는 농생물게놈활용연구사업단에서 교목성 자가불화합성 장미과 과수인 사과와 배, 덩굴성 자가화합성 과수인 포도를 대표작물로 선정하고 1단계에서 핵심집단을 구축한 바 있으며, 현재 자원을 이용한 게놈전체연관분석이 추진 중이다. GWAS기술을 이용한 유용유전자의 동정과 분자표지의 개발은 과수작물이 가진 유전분석의 어려움을 극복하고 유전자원을 이용하여 농업적으로 중요한 형질과 관련된 유전자를 탐색과 이용에 대한 효율을 높일 수 있는 장점이 있다. 따라서 그 연구결과는 해당 작물뿐 아니라 과수 전체의 유전현상에 이해를 높이고 고효율, 정밀 육종을 통해 국내 과수육종의 경쟁력을 크게 증진할 수 있을 것이다.

배 유기재배 과수원에서 최근 문제되는 병해충 종류와 재배농가의 병해충 관리수준을 설문조사하고 조류, 양서류, 파충류, 설치류 등 척추동물의 생물다양성을 일반 화학농약 방제농가와 비교하고자 2010년에 포장조사를 수행하였다. 유기재배 과수원 총 22개소에서 설문조사와 포장조사를 한 결과, 유기재배 농가는 유기재배 병해충 관리자재로 석회황합제, 식물추출물 및 미생물 혼합물, 오일류 등을 선호하였으며, 주요 문제 병해충은 검은별무늬병, 붉은별무늬병, 깍지벌레류, 배나무면충, 배굴나방 등이었다. 유기자재 살포횟수는 병해 방제를 위해 9~10회, 해충 방제를 위해 5~6회 수준이었다. 유기재배 과수원이 관행재배에 비해 검은별무늬병 이병율과 이병도는 높았으나, 깍지벌레류 피해는 차이가 없었고 과중은 감소하였다. 양서류, 뱀, 설치류, 꿩 등은 관행재배와 유기재배 과수원 간에 차이를 확인할 수 없었으나, 멧비둘기의 경우 유기재배 과수원에서 개체수가 유의하게 많은 섭식활동을 하였다.

The purpose of the present study is to construct a rural development strategy from the nexus between spatial changes in specialized crops and suitable cultivation area of the crops. This paper pays particular attention to identify product life cycle of specialized crops in rural areas and estimate the impact of climate change on alterations in spatial distribution of the crops. In order to do so, first of all, this study applies multi-level model (Random coefficient model) to estimate the regional coefficient of five orchard crops. It utilizes the data 1995 to 2010 Korea Agricultural Census. Futhermore, it also adopts overlay analysis by ArcGIS to identify the development path of the crops and the relationship with climate change. Based on the results, it suggests a mechanism activating regional agriculture. The findings propose re-searching and relocating specialized regions of the crops. Especially, it proves each rural area can drive the new agricultural strategy to strengthen regional agriculture by estimating the relationship between development of specialized crops and suitable cultivation areas. For instance, shifting specialized crops in particular regions and enriching genetic or species varieties can be primary measures and it will contribute to improve the reliable base for income sources in the rural communities. This paper also offers specific policy implications regarding rural development plans in response to crops' life cycle and climate changes.

This study was conducted to select promising green manure crops, providing sufficient amount of nutrients for satisfying fruit tree growth, with the overwintering cover crops grown in organic orchards in 2009. The cover covers were investigated in 13 organic orchards in Chonnam province in April and June. The dry matter in cover crops observed in April and June was the highest for Lolium multiflorum Lam. and Bromus japonicus Thunb., respectively. Total N and K production in April was the highest for Lolium multiflorum Lam, Vicia hirsuta (L.) S. F. Gray and Vicia angustifolia var. segetilis (Thuill.) K. Koch., respectively, with Bromus japonicus Thunb. in June. This study showed that the leguminous crops, Vicia hirsuta (L.) and Vicia angustifolia, would be the prospective cover covers as the both crops provided sufficient amount of N and K2O into the soil. Amount of P2O5 producing from all cover crops provided less than nutrient levels than those of recommended nutrient requirement for satisfying 10- to 15-year-old fruit tree growth.

This study was conducted to evaluate nutrient production of both orchardgrass and several clovers as a green manure in a ‘Niitaka’ pear (Pyrus pyriforia) orchard. The experiment was conducted at diligent fanner in Boseong in Chonnam on March 26 of 2010, and the treatments included; 1) orchard grass (2.0㎏/l,000㎡), 2) orchard grass (1.0㎏/l,000㎡)+ladino clover (1.0 ㎏/1,000m2), 3) orchard grass (1.0㎏/1,000㎡)+red clover (1.0㎏/1,000㎡), and 4) orchard grass (1.0㎏/1,000㎡)+white clover (1.0㎏/1,000㎡). Lengths of orchardgrass and clovers were greater in July than those of June and September. Seeding of orchardgrass without clovers in June and July increased dry weight of green manure crops compared with the seeding of orchardgrass with clovers, resulting in greater annual total dry weight. Various green manure treatments produced different amounts of total N and P₂O₅ from each raw materials and did not satisfy amounts of those nutrients for proper annual growth of ten- to twelve-year-old pear tree. Amounts of K₂O producing from green manures, however, satisfied for proper growth of the pear trees.

This research was carried out to investigate invertebrate fauna with organic and conventional pear orchards, which used four collected methods; soil sampling for soil microorganism, pitfall, malaise, and black light trap for over ground species. Collected species were 37 species, 1,184 individuals in organic and 28 species, 501 individuals by soil sampling in conventional pear fields. Those were 38 species, 646 individuals and 29 species, 440 individuals by pitfall trap, 55 species 650 individuals and 47 species, 508 individuals by malaise trap, and 23 species, 201 individuals and 9 species, 42 individuals by black light trap. Collembola was collected 389 individuals in organic which was 5 times than in conventional in soil sampling. In pitfall trap, that was 183 individuals which was 3 times. The diversity indices of organic pear orchards were 1.956 in May, 2.638 in August and those of conventional was 1.426 in May, 2.011 in August in soil sampling. In pitfall trap, the dominant species were spiders, collembollan, and coleopteran. Among Coleoptera, indicator insects for the evaluation of agricultural environment suggested were Eusilpha jakowelewi as organic pear orchard and Anisodactykus punctatipennis and Pheropsophus jessoensis as conventional. Malaise trap was collected dominant species as Diptera and Hymenoptera of Braconidae and Ichneumonidae. The diversity indices of organic pear orchards were 2.952, 3.120, and 2.010 in pitfall, malaise and black light trap in over ground invertebrate sampling. The highest diversity was in malaise trap. The higher diversity indices, the lower dominance indices.

This study was conducted to investigate an effects on ago󰠏chemical alternative materials such as the wood vinegar, a lactic acid bacteria serum, the fermented plant juice, the brown rice vinegar and a Chitosan used for amount and qualities of fruits and to examine the pest protection efficiency for their uses in the apple and pear orchard farms. An apple yields in the orchard cultivated with using the ago󰠏chemical alternative materials without appling the fertilizer and pesticides were decreased at 56% relative to the conventional farming practice method. Also, it was indicated that there was difficult to produce the fruits with marketability because the small sizes of fruits were produced. For the quality of fruits, the brix of apple produced in the orchard cultivated with using the ago󰠏chemical alternative materials was similar, but Vitamin C content was greater than that of the conventional farming practice method. As a results of treating with the wood vinegar, a lactic acid bacteria serum, the fermented plant juice, the brown rice vinegar and a Chitosan instead of applying pesticides, the fruit disease in the Chitosan treatment was a little decreased, but was great occurred in the other treatments compared with the conventional farming practice method. However, it observed that brix and Vitamin C content of apple produced in the Chitosan, brown rice vinegar, fermented plan juice and fish amino acid treatments and in the Chitosan, brown rice vinegar, charcoal power and peat moss treatments were greater than those of the conventional farming practice method, respectively. Over all, it considered that there was very difficult to manage the orchard depended on the ago󰠏chemical alternative materials without appling the chemical fertilizer and pesticides in the apple orchard, but it might be proper to use the ago󰠏chemical alternative materials as an auxiliary means to decrease the appling amount of chemical fertilizer and pesticides. Furthermore, the general effects on the ago󰠏chemical alternative materials to the perennial fruits should be investigated with considering the changes of soil fertility, soil microbial status and natural enemy creatures after treating them for a long time.

To carry out the Integrated Fruit Production(IFP), researches on cover crops as well the Integrated Pest Management(IPM) and the Integrated Nutrition Management(INM) should be very important. These concepts are neither clear nor connective till now. The researches on cover crops in Europe and USA are being kept within the category of IFP. Main researches on fruit trees for sustainable agriculture in Italy are new variety creation, development of growing techniques, pest and disease control, and cover crops management, etc. It is necessary of fruit industry in Korea to maintain good quality and eco󰠏friendly fruit production. For this goal, we need international cooperation with highly developed countries in Europe. In first step, we should enlarge research areas and analyze results obtained to get farmers understood the concept of cover crop growing. Furthermore, we make researches more profoundly on cover crops growing considering tree age, mixing rates among cover crops, seeding and cutting time for cover crops, and so on. Researchers, specialists of agricultural extensions, and farmers should concentrate their opinions and conduct IFP together. The IFP should go on systematically and reach finally to get certificates internationally by the International Organization for Biological and integrated Control of Noxious Animals and Plants(IOBC) to enhance selling and exporting fruits.