• 한국작물학회지
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• 제51권2호
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• pp.179-185
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• 2006

The Ministry of Agriculture and Forestry announced in 2001 that the overall amount of paddy land set aside for rice will be cut down by 12% by 2005, decreasing from 1.08 million to 953,000 hectares. When evaluating the value of paddy rice systems, the multi-function of paddy systems in the monsoon climate is vital importance. The main functions of paddy rice systems are to conserve biodiversity and maintain sustainability. Some crucial environmental benefits of the paddy rice systems include: flood prevention, recharge of water resources, water purification, soil erosion and landslide prevention, soil purification, landscape preservation and air purification. The paddy rice systems in Korea, which are more diverse than upland crop systems, are known to be composed of 14 orders, 36 families and 134 species. The sustain ability of paddy rice production systems can never be overestimated. Rice is part of the culture and even the heart of spiritual life in the area under the monsoon climate. Therefore paddy rice systems should be preserved with the highest priority being the enhancement of the systems' multi-function. As an outlook to future research, the need of joint and interdisciplinary research projects between economists and natural scientists at inland as well as international levels were emphasized in establishing the development of counter-measure logic through actual proofed analysis.

• 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.

• 한국잡초학회지
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• 제13권4호
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• pp.210-233
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• 1993

The herbicide has become indispensable as much as nitrogen fertilizer in Korean agriculture from 1970 onwards. It is estimated that in 1991 more than 40 herbicides were registered for rice crop and treated to an area 1.41 times the rice acreage ; more than 30 herbicides were registered for field crops and treated to 89% of the crop area ; the treatment acreage of 3 non-selective foliar-applied herbicides reached 2,555 thousand hectares. During the last 25 years herbicides have benefited the Korean farmers substantially in labor, cost and time of farming. Any herbicide which causes crop injury in ordinary uses is not allowed to register in most country. Herbicides, however, can cause crop injury more or less when they are misused, abused or used under adverse environments. The herbicide use more than 100% of crop acreage means an increased probability of which herbicides are used wrong or under adverse situation. This is true as evidenced by that about 25% of farmers have experienced the herbicide caused crop injury more than once during last 10 years on authors' nationwide surveys in 1992 and 1993 ; one-half of the injury incidences were with crop yield loss greater than 10%. Crop injury caused by herbicide had not occurred to a serious extent in the 1960s when the herbicides fewer than 5 were used by farmers to the field less than 12% of total acreage. Farmers ascribed about 53% of the herbicidal injury incidences at their fields to their misuses such as overdose, careless or improper application, off-time application or wrong choice of the herbicide, etc. While 47% of the incidences were mainly due to adverse natural conditions. Such misuses can be reduced to a minimum through enhanced education/extension services for right uses and, although undesirable, increased farmers' experiences of phytotoxicity. The most difficult primary problem arises from lack of countermeasures for farmers to cope with various adverse environmental conditions. At present almost all the herbicides have"Do not use!" instructions on label to avoid crop injury under adverse environments. These "Do not use!" situations Include sandy, highly percolating, or infertile soils, cool water gushing paddy, poorly draining paddy, terraced paddy, too wet or dry soils, days of abnormally cool or high air temperature, etc. Meanwhile, the cultivated lands are under poor conditions : the average organic matter content ranges 2.5 to 2.8% in paddy soil and 2.0 to 2.6% in upland soil ; the canon exchange capacity ranges 8 to 12 m.e. ; approximately 43% of paddy and 56% of upland are of sandy to sandy gravel soil ; only 42% of paddy and 16% of upland fields are on flat land. The present situation would mean that about 40 to 50% of soil applied herbicides are used on the field where the label instructs "Do not use!". Yet no positive effort has been made for 25 years long by government or companies to develop countermeasures. It is a really sophisticated social problem. In the 1960s and 1970s a subside program to incoporate hillside red clayish soil into sandy paddy as well as campaign for increased application of compost to the field had been operating. Yet majority of the sandy soils remains sandy and the program and campaign had been stopped. With regard to this sandy soil problem the authors have developed a method of "split application of a herbicide onto sandy soil field". A model case study has been carried out with success and is introduced with key procedure in this paper. Climate is variable in its nature. Among the climatic components sudden fall or rise in temperature is hardly avoidable for a crop plant. Our spring air temperature fluctuates so much ; for example, the daily mean air temperature of Inchon city varied from 6.31 to $16.81^{\circ}C$ on April 20, early seeding time of crops, within${\times}$2Sd range of 30 year records. Seeding early in season means an increased liability to phytotoxicity, and this will be more evident in direct water-seeding of rice. About 20% of farmers depend on the cold underground-water pumped for rice irrigation. If the well is deep over 70m, the fresh water may be about $10^{\circ}C$ cold. The water should be warmed to about $20^{\circ}C$ before irrigation. This is not so practiced well by farmers. In addition to the forementioned adverse conditions there exist many other aspects to be amended. Among them the worst for liquid spray type herbicides is almost total lacking in proper knowledge of nozzle types and concern with even spray by the administrative, rural extension officers, company and farmers. Even not available in the market are the nozzles and sprayers appropriate for herbicides spray. Most people perceive all the pesticide sprayers same and concern much with the speed and easiness of spray, not with correct spray. There exist many points to be improved to minimize herbicidal phytotoxicity in Korea and many ways to achieve the goal. First of all it is suggested that 1) the present evaluation of a new herbicide at standard and double doses in registration trials is to be an evaluation for standard, double and triple doses to exploit the response slope in making decision for approval and recommendation of different dose for different situation on label, 2) the government is to recognize the facts and nature of the present problem to correct the present misperceptions and to develop an appropriate national program for improvement of soil conditions, spray equipment, extention manpower and services, 3) the researchers are to enhance researches on the countermeasures and 4) the herbicide makers/dealers are to correct their misperceptions and policy for sales, to develop database on the detailed use conditions of consumer one by one and to serve the consumers with direct counsel based on the database.

• 로봇학회논문지
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• 제15권2호
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• pp.124-130
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• 2020

This paper designed modular agricultural robotic platform capable of a variety of agricultural tasks to address the problems caused by a decline in agricultural populations and an increase in average age. We propose a modular robotic platform that can perform many tasks required in field farming by replacing only work modules with common robotic platforms. This platform is capable of steering while driving on four wheels in an upland environment where farm work is performed, and an attitude control module is attached to each drive module to control the attitude of the platform. In addition, the width of the platform is designed to be variable in order to operate in various ridges according to the crop cultivation method. Finally, we evaluated five items: variable width, gradient, attitude control angle, step and road speed in order to carry out the farming industry while maintaining a stable posture.

• 한국농공학회논문집
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• 제54권4호
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• pp.1-8
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• 2012

This study is to assess the reduction of non-point source pollution loads for rice straw surface covering of upland crop cultivation at a watershed scale. For Byulmi-cheon watershed ($1.21km^2$) located in the upstream of Gyeongancheon, the HSPF (Hydrological Simulation Program-Fortran), a physically based distributed hydrological model was applied. Before evaluation, the model was calibrated and validated using 9 rainfall events. The Nash-Sutcliffe model efficiency (NSE) for streamflow was 0.62~0.78 and the NSE for water quality (Sediment, T-N, and T-P) were 0.68, 0.60, and 0.58 respectively. From the field experiment of 16 rainfall events, the rice straw covering reduced surface runoff average 10 % compared to normal surface condition. By handling infiltration parameter (INFILT) in the model, the value of 16.0 mm/hr was found to reduce about 10 % reduction of surface runoff. For this condition, the reduction effect of Sediment, T-N, and T-P loads were 87.2, 28.5, and 85.1 % respectively. The rice straw surface covering was effective for removing surface runoff dependent loads such as Sediment and T-P.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.204-204
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• 2017

In recent years the growth rates of world agricultural production and crop yields have slowed because of rapid urbanization but the agriculture mechanization implies the use of various power sources and improved farm tools and equipment to enhance the efficiency of utilization of various crop input. Therefore the current study was conducted to investigate the growth characteristics of seedlings treated with plant growth regulators for the production of seeds suitable for mechanical formulations of soybeans and red beans. The seeds of Uram bean and Arary red bean were sown in 128 well plug tray as the testing varieties. Three growth inhibitors such as 0.05% hexaconazole, prohexadion-calcium, and 0.1% diniconazole were treated and fifteen representative plants were collected from each treatment at 2, 5, 7, 13, 16, 17, 19, and 20 days interval after treatment. The collected plants were examined for the growth atributes such as plant height, root length, leaf area and chlorophyll. The growth promoter was treated at the 13th day after treatment with growth inhibitor and treated with 0.1% concentration of Pomina ($GA_{4+7}$ 1.8% + 6-benzylaminopurine 1.8%) and Nonaji (gibberellic acid 2% + $GA_{4+7}$ 2%). Initially the growth data was recorded to examine the effect of growth inhibitor, while after treatment with growth promoters, the growth attributes were recorded at 4th and 7th day. As a result of measuring the growth parameter of soybean, the inhibitory effect was shown in the aerobic treatment at the ground level at the 7th day after treatment. At the 4th day of growth promoting agents treatment, the stimulation effect of non - treated plants was greater than that of formalin treatments. As a result of measuring the growth attributes of red bean, In the latter part of the growth, at the 4th day after the growth promoter treatment. This study was able to confirm the effective growth regulators and treatment periods for each crop, and it was possible to control the growth of seedlings. Based on these results, it can be expected that the basis of seedling production technology of crops which is necessary for sowing and transplantation mechanization of agriculturle field can be established.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.203-203
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• 2022

A new winter wheat(Triticum aestivum L.) cultivar "Hwanggeumal" was developed by the NICS(National Institute of Crop Science), RDA(Rular Dvelopment Administraion) in 2019. It was derived from a cross of the "Jokyoung//Kauz/Rayon" and "Jopoom" in 2008. It had advanced generation through bulk and pedigree method for seven years and designated line name "Jeonju398" after AYT(Advance Yield Trial) test for two years. And "Hwangeumal" was designated variety name after RYT(Regional Yield Trial) test in eight locations around Korea for two years from 2018 to 2019. Its heading date was April 19 and maturity date was May 31, which were similar to Jokyoung. "Hwanggeumal" had shorter plant height(75 cm) and spike length(7.1 cm), spikes per m²(699) and lower 1,000 grain weight(44.2 g) than "Jokyoung"(78 cm, 8.2 cm, 776, 46.6 g, respectively). "Hwanggeumal" was showed weak to winter hardiness and susceptible to powdery mildew but tolerance to PHS(Pre-harvest sprouting). The average grain yield in the AYT was 6.2 ton/ha, which were 10% more than "Jokyoung" And in the RYT was 5.1 ton/ha in upland and 4.4 ton/ha in paddy field, which were lower than "Jokyoung", respectively. "Hwanggeumal"s flour yield (71.4%) and flour lightness (91.82) showed similar to "Jokyung" and higher protein content (14.0%) and gluten content (10.3%) and SDS-sedimentation volume (60.3ml). These result showed that the "Hwanggeumal" dough strength of flour is strong than "Jokyung". "Hwanggeumal"s HMW-GS(High molecular weight gluten subunits) composition are Glu-D1 (5+10), Granule-bound starch synthase(GBSS) composition are Wx-A1 (a), Wx-B1 (b), Wx-D1 (a) and composition of Puroindolines are Pina-D1(a), Pinb-D1(b).

• 한국잡초학회지
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• 제12권4호
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• pp.317-334
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• 1992

우리나라 농경지(農耕地)에 발생(發生)되는 주요(主要) 잡초분포현황(雜草分布現況)과 변화(變化) 양상(樣相)을 구명(究明)하기 위해 최근(最近)에 보고(報告)된 연구결과(硏究結果)를 토대(土臺)로 논과 밭을 중심(中心)으로 분석(分析)하였다. 1. 논의 경우 1971년(年), 1981년(年), 1991년(年), 3 회(回)에 걸쳐 잡초분포양상(雜草分布樣相)을 조사(調査)한 결과(結果) 주요(主要) 문제(問題) 잡초(雜草)의 종류(種類)는 18과(科)29종(種)으로 연차간(年次間)에 큰 차이(差異)를 보이지 않았으나, 우점초종(優占草種)의 구성양상(構成樣相)은 연차간(年次間)에 큰 차이(差異)를 보였다. 1971년(年)에는 일년생잡초(一年生雜草)의 구위비율(構威比率)은 79%였고 우점초종(優占草種)은 마디꽃(41%), 쇠털골(12%), 물달개비(11%), 알방동사니(8%), 피(7%), 등(等)이었다. 1981년(年)에는 다년생잡초(多年生雜草)의 발생비율(發生比率)이 53%로 크게 증가(增加)하였고 이때의 주요(主要) 우점초종(優占草種)은 물달개비(22%), 올미(18%), 벗풀(9%), 가래(9%), 너도방동사니(9%), 마디꽃(6%), 등(等)이었으며 피의 우점도(優占度)는 2.3%로 매우 낮아졌다. 1991년(年)에는 다년생잡초(多年生雜草)가 58%이었고 주요(主要) 문제잡초(問題雜草)는 올방개(20%), 올미(16%), 벗풀(13%), 피(12%), 물달개비(11%), 올챙고랭이(6%) 등(等)으로 올방개와 피의 발생(發生)이 급속도(急速度)로 증가(增加)하였다. 2. 주요우점초종(主要優占草種)의 구성내용(構成內容)은 지역적(地域的)으로도 차이(差異)를 보였는데 호남지방(湖南地方)에서는 1991년(年) 현재(現在)까지 올미가 전체(全體) 발생량(發生量)의 30% 이상(以上)을 차지하는 가장 중요(重要)한 잡초(雜草)인데 반(反)해 중부지방(中部地方)과 영남지방(嶺南地方)에서는 1991년(年) 현재(現在) 올방개, 벗풀, 피가 가장 문제잡초(問題雜草)로 인식(認識)되었다. 3. 1981년(年) 발생(發生) 비율(比率)이 2.3% 이였던 피가 최근(最近)에 급속도(急速度)로 발생량(發生量)이 증가(增加)하고 있는데 이는 최근(最近)의 경운정지(耕耘整地) 작업(作業)의 성략화(省略化) 및 성력화(省力化)와, 물관리(管理) 불철저(不撤底)의 재배(栽培) 환경변화(環境變化)와 아울러 제초제(除草劑) 푸마시 이후(以後)의 일발처리제(一發處理劑) 사용면적(使用面積) 확대(擴大)와 밀접(密接)한 관계(關係)가 있었다. 4. 밭 작물재배지(作物栽培地)에 발생(發生)되는 잡초(雜草)는 46과(科) 216종(種)이었는데, 동작물(冬作物) 보다 하작물(夏作物) 지대(地帶)에 24종(種)이 더 많이 발생(發生)되었다. 작물종류별(作物種類別)로는 과수원(果樹園)과 마늘 재배지(栽培地)가 약(約) 85종(種)의 잡초(雜草)가 분포(分布)되어 가장 많은 잡초(雜草)가 자라는 작물(作物)이었고 참깨, 감자 및 풋고추 재배지(栽培地)는 45~56종(種)의 잡초가 발생(發生)되어 비교적(比較的) 적은 작물재배지(作物栽培地)였다. 주요(主要) 우점(優占) 초종(草種)으로는 동작물(冬作物) 재배지(栽培地)의 경우 둑새풀, 명아주, 벼룩나물, 별꽃, 갈퀴덩굴, 속속이풀, 냉이, 방동사니 등(等)이었고 하작물(夏作物) 재배지(栽培地)는 바랭이, 쇠비름, 깨풀, 강아지풀, 방동사니, 명아주, 망초, 쑥 등(等)이었다.

• 한국초지조사료학회지
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• 제38권1호
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• pp.16-22
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• 2018

'하이어리'는 월동이 가능하면서 수확이 빨라 답리작 재배가 가능한 조숙성 귀리 품종을 개발하기 위해서 2016년 농촌진흥청 국립식량과학원에서 육성되었다. 잡종은 2004년 '517 A2-121(IT133383)'에 'CI7604(IT133379)'을 인공 교배하여 작성되었으며, 집단 및 계통 선발에 우량계통인 'SO2004015-B-B-23-1-3-7'을 선발하였다. 이 계통은 2012년부터 2013년까지 2년간 생산력검정시험을 실시하였으며, 월동재배가 가능한 조사료용 귀리로 우수한 계통으로 판명되어 '귀리92호'로 계통명을 부여하고 지역적응시험에 상정하였다. 지역적응시험은 2014년부터 2016년까지 3년간 제주, 예산, 익산, 전주 등 4개 지역에서 실시하였다. 이 계통은 2016년 9월 신품종으로 선정되었으며, 그 특성은 다음과 같다. 귀리 품종 '하이어리'는 녹색 잎, 갈색의 종실을 가졌다. 출수기는 전국 평균 4월 26일로 표준품종인 '삼한'보다 9일 빨랐다. '하이어리'의 내한성은 '삼한'과 대등하였고, 도복은 약간 약했다. 건물수량은 ha당 평균 14.2톤으로 14톤인 '삼한'에 비해 약간 많았다. '하이어리'는 조단백질 함량이 6.2 %, 가소화양분총량(TDN)이 61.0 %로 '삼한'(각각 7.0 %, 62.5 %)에 비해 다소 낮았으나 TDN 수량은 ha당 7.91톤으로 7.64톤인 '삼한'보다 0.27톤 많았다. '하이어리'의 적응지역은 1월 최저평균기온이 $-6^{\circ}C$ 이상인 지역이면 전국 어느 곳에서나 재배가 가능하며, 특히 겨울작물의 조기수확이 필요한 벼 이모작 지대에서 활용도가 높을 것으로 기대된다.

• 한국농공학회논문집
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• 제54권6호
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• pp.89-99
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• 2012

An upland monitoring was conducted for about 4 years with respect to the water and quality of rainfall-runoff. The objective was to characterize of runoff and nonpoint source (NPS) pollution from a sandy field with 4.5 % in slope under balloonflower (2008-2010) and potato (2011) cultivation. Balloonflower was cultivated without any surface cover but potato was grown under plastic mulching. Runoff rate, EMCs and NPS pollution loads were estimated. The first flush effect was evaluated, and the correlation coefficient among the selected water quality indices were analyzed. Average rainfall size was higher by 2.3 mm when balloonflower was cultivated but average runoff rate was higher by 0.02 when potato was cultivated due to the plastic mulching. EMCs monitored from balloonflower field were higher than potato field except SS and TN, but all NPS pollution loads of potato field were 2.1~22.9 times greater than balloonflower field because of larger runoff volume. As a result of first flush effects, balloonflower and potato field were more influenced by increasing of accumulated rainfall and rainfall intensity rather than first flush. In the result of correlation analysis, there were no evident correlations between runoff and water quality indices. However, there were obvious correlations between SS and the other indices except TN. As a result of this study, it was thought that perennial balloonflower crop could help reduce runoff and NPS pollution loads but annual crop with plastic mulching increase them.