• 한국환경복원기술학회지
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• 제12권2호
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• pp.29-39
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• 2009

Research was initiated to investigate a vegetation characteristics of the winter season by seeding periods. 3 seeding periods (Mid-December seeding plot, Late January seeding plot and Early March seeding plot) and 3 zones (the top zone, the middle zone and the bottom zone) in each plot were treated with 3 replications on the experimented slope. Data such as vegetation coverage (%), soil hardness (MPa), temperature ($^{\circ}C$) and moisture (%) content were analyzed. The vegetation coverage was high in Early March seeding plot, medium in Mid-December, and low in Late January seeding plot. Early March seeding plot was effective in moisture content, soil hardness, and temperature for the growth of vegetation when compared to Late January seeding plot and Mid-December seeding plot. From the standpoint of coverage ratio of plant species, the coverage of Dianthus sinensis and Albizzia julibrissin were high in the Late January seeding plot whereas the coverage of Lotus corniculatus and Cool-season turfgrass were high in Early March seeding plot. These results indicated that the high vegetation coverage of Dianthus sinensis and Albizzia julibrissin in Early March seeding plot was caused by scarification during winter season. There was no difference observed in plant height regardless of seeding periods except in early surveying time of May and June after seeding. As far as each zone of the plot was concerned, the vegetation coverage was high. in the bottom zone, medium in the middle zone and low in the top zone. The bottom area of the experimented slope was high in moisture content when compared to the middle zone and the top zone.

• 현장농수산연구지
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• 제3권1호
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• pp.30-47
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• 2001

This research was performed to develope a stable direct seeding method in rice cultivation using by a direct seeder with soil application. A principle of this methodology was introduced from seeding nursery system of machine transplanting enable to increase high seeding establishment direct seeding method with soil application was high of 89-95% while that of water seeding was 68%. During seeding growth plant height was ralatively small but seeding health was high. A total soil consumption of this methodology was 145kg/10a in dirll seeding and 26kg/10a in hill seeding respectively, there was 100% erected in direct seeding with soil application while water seeding was 45% in erected seeding stand. In direct seeding method with soil application total carbohydrate content was higher than that of water seeding. This machine was manufactured to attach and/or detach to a machine transplanter with riding type and machine cultivator with multipurpose. In the farmer's demonstrated rice field this method was well performed like machine transplanting in terms of rice growth and development. There was highly cost reduction for rice production like other direct seeding methods.

• 한국작물학회지
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• 제41권1호
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• pp.28-33
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• 1996

벼 건답직파재배에서 화성벼를 공시 종자조건, 파종후 복토 및 파종후 관개시기등을 달리한 파종방법 차이가 입모정도. 생육특성 및 수량에 미치는 영향을 검토하였던 결과는 다음과 같다. 1. 입모수는 파종후 관개배수를 하는 것이 입모후 담수를 하는 것보다 많았으며, 휴입세조파가 평면세조파후 무복토나 점파보다 많았다. 2. 파종후 관개배수가 위묘후 담수보다 출아일수는 6∼10일 짧았고, 출수기는 2∼3일 일렀다. 3. 경수는 생육초기에는 휴입세조파와 평면세조파후 복토(관행 : 건종자로 평면세조파 후 복토를 하고 입모후 담수를 한 파종방법)에서 많았으나, 유수형성기 이후의 경수 및 수수는 평면세조파후 무복토(침종종자로 평면세조파후 복토를 하지 않고 파종직후 관개배수를 한 파종방법)에서 가장 많았다. 4. 도복지수는 휴입세조파가 점파나 평면세조파보다 약간 높았고, 포장도복은 휴입세조파와 평면세조파 무복토에서 1 정도의 가벼운 도복이 발생되었다. 5. 쌀 수량은 관행인 평면세조파후 복토(5.35t/ha)보다 평면세조파후 무복토에서 7％ 증수되었다.

• 한국작물학회지
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• 제43권2호
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• pp.124-127
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• 1998

Since weedy rice problems have emerged with the recent advent of direct seeding cultivation in Korea, the establishment of effective control strategies for weedy rice is considered to be one of the urgent issues to be solved for widely practiced direct seeding rice cultivation. A three year experiment was conducted to investigate the occurrence pattern of weedy rice in four different rice cultivation practices: high ridged dry seeding, wet drill seeding, water seeding, and machine transplanting. The highest weedy rice occurrence of 11.0% was observed in high ridged dry seeding practice followed by 9.6% in wet drill seeding, 6.4% in water seeding practice, and 0.2% in machine transplanting practice, respectively. The same trend was observed when we examine the occurrence of contamination of panicle and rice grain by weedy rice. More contamination was observed in high ridged dry seeding than any other practices. It was also found that the possible emergence depths from the soil surface was deeper in both in ridged dry seeding and wet drill seeding practice (0-5 cm from the soil surface) than those in water seeding (0-4 cm), and machine transplanting practice (0-3 cm). The highest yield reduction of 19.5% was observed in high ridged dry seeding practice followed by 13.0% in wet drill seeding, 6.3% in water seeding practice. The reduction may have occurred to the competition between weedy rice and cultivated rice, These findings suggest that among the four cultural practices examined, the machine transplanting practice is the most effective method to control and reduce the weedy rice occurrence and weedy rice seed in soil.

• 한국작물학회지
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• 제45권4호
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• pp.232-236
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• 2000

To obtain a basic information on the development of effective control strategies for weedy rice in direct seeding rice cultivation, occurrence patterns of weedy rice as influenced by different cultural practices such as cultivation method, water management, seeding time, and tillage were investigated in field or pot experiments. High occurrence of weedy rice was observed in a continuous direct seeding paddy field as compared to machine transplanted one. Based on the percent of weedy rice panicle over three years trial, high ridged dry seeding was highest with 36.9%, followed by wet seeding with 30.9%, water seeding with 14.6% and machine transplanting rice with 0.8%, indicating 97.8% reduction in weedy rice occurrence by machine transplanting rice as compared with high ridged dry seeding. Germination of weedy rice was promoted to 83-94 % when rice panicle was flooded from September 30 to October 10 for 6 days and 74-88% for 9 days on October 20. Weedy rice occurrence was also substantially reduced by delayed seeding on June 10 and intensive tillage. The results suggest that machine transplanting rice be more effective cultural practice than flooding treatment, delayed seeding and intensive tillage when weedy rice problem occurs in direct seeded paddy field.

• 한국작물학회지
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• 제45권1호
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• pp.14-19
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• 2000

In order to develop an appropriate cultural practice for a newly bred 2-rowed, waxy, naked barley cultivar 'Duwonchapssalbori' in the southern region, 2 varieties, 3 seeding dates, 4 seeding rates were designed with 2 replications. The heading and maturity dates of 'Duwonchapssalbori' were' earlier than 'Saessalbori by 2-5 and 4 days, respectively. Culm length of 'Duwonchapssalbori' was 60 to 66cm with lodging resistance. Grain yields of both varieties were 4.28-4.33 ton/ha in the plot of Oct. 20 seeding, 4.11-4.18 ton in the plot of Oct. 28 seeding, and 3.7-13.89 ton/ha in the Nov. 5 seeding. Grain yield with different seeding rates highly significantly fitted with secondary polynomial equations in the plots of Oct. 20 and Oct. 28 seedings ($R^2$=0.84-0.85), showing the greatest yield with seeding rate of 140kg per ha. However, the grain yield with various seeding rates in the plot of Nov. 5 seeding showed simple linear regression ($R^2$=0.71), showing the seeding rate over 160kg in the case of later seeding to be optimal. Number of spikes per $m^2$ significantly contributed to grain yield, and fitted to simple linear regression ($R^2$=0.881-0.891), suggesting that plenty of early stands should be established at early seedling stage for high grain yield. Young spikes of 'Duwonchapssalbori' in the plot of Oct. 20 seeding elongated with linear increments since Feb. 10 (6.7mm), and showed rapid increment since March 7 (15.1mm). However, elongation of young spikes of 'Saessalbori' began from March 15 with slow increments. From these studies, the optimum seeding date and seeding rate in 'Duwonchapssalbori' were Oct. 20-28 and 140kg per ha for high grain yield in the southern regions.

• 한국초지조사료학회지
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• 제25권1호
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• pp.17-22
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• 2005

This experiment was conducted to investigate the effect of seeding dates and rates on the productivity and nutritive value of hairy vetch(Vicia villosa Roth) at experimental field of Grassland and Forage Crops Division, National Livestock Research Institute, RDA, Suwon from 1999 to 2000. The experimental design was consisted of split-plot design with three replications. The main plot was seeding dates(25 Aug., 15 Sep. and 5 Oct.) and the subplot was seeding rates(20, 30 and 40 kg/ha). Late seeding dates increased the plant height and delayed the flowering stage as 1 or 2 days. The dry matter(DM) content was decreased with low seeding rates, and the trend was same in the all plots. Average crude protein(CP) content was $24.1\%$ and increased with delayed seeding date and lower seeding rate. The content of acid detergent fiber(ADF) and neutral detergent fiber(NDF) was increased with higher seeding rate, but seeding date did not affect. In vitro dry matter digestibility(IVDMD) of hairy vetch tended to decrease with high seeding rate, and total digestible nutrient(TND) did not show significant difference among seeding rates. Average relative feed value(RFV) of hairy vetch showed 140 which means very high quality. Dry matter and CP yield was decreased with delayed seeding date. The results of this experiments indicated that seeding in middle-August with 40 kg/ha would be recommended to produce the highest yield and quality f3r the cultivation of hairy vetch in middle part of Korea

• 한국자원식물학회지
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• 제19권3호
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• pp.401-404
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• 2006

In order to select the seeding machine for mechanizing cultivation of rapeseed in southern areas of Korea, three different seeding machines, ridge rotary, power tiller ridge rotary, tractor ridge rotary were used for sowing one of the high yielding rapeseed cv. Hybrid with five different seeding methods. Seeding of ridge rotary was reduced the seeding effort with 45% and yield components such as plant height, ear length, number of branches and pods, pod length and seed setting rate were higher. The seeding of ridge rotary also was showed highest seed yield. On the basis of time requirement for seeding, vegetative and yield parameters ridge rotary seeding machine was a suitable seeding machine for rapeseed cultivation at the southern area of Korea.

• 한국작물학회지
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• 제37권6호
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• pp.541-549
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• 1992

벼 담수표면직파재배시 파종기 및 품종을 기상 및 재배 환경과의 관계를 구조적으로 분석하여 담수직파에서 흔히 발생하는 도복의 방상대책과 후기등숙생리를 검토한 결과는 아래와 같다. 1. 초기생육형수질중에서 출아일수는 조기파종일수록 길었으며 단립면적당 입묘수 및 입묘율은 파종이 늦을수록 그리고 만생종일수록 많고 양호하였다. 2. 단립면적당 수수는 파종이 늦을수록 감소하였으며 유효경비율은 만파인 5월 21일 파종구에서 가장 낮았다. 출수개화일수는 파종기가 늦을수록 단축되었으며 등숙기간중 강우분포는 조생종의 등숙기에 많았고 중ㆍ만생종의 등숙기에는 비교적 적었다. 파종기별 및 품종의 숙기별 포장도복정도는 파종이 빠를수록, 그리고 숙기가 빠를수록 컸다. 5. 수량 및 수량구성형질은 파종이 빠를수록 많고 양호했으며 특히 등숙비율은 그차이가 뚜렸하였다.

• 한국작물학회지
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• 제45권3호
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• pp.185-189
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• 2000

영남내륙지역에서 직파재배용 벼 품종인 동안벼, 대산벼, 농호벼, 호안벼, 광안벼를 공시하여 적정 파종기를 구명하기 위해 시험한 결과를 요약하면 다음과 같다. 1 출아소요기간은 5월 30일 파종기에서 12일로 가장 짧았으며, 입모수는 5월 10일과 5월 30일에서 많았다. 2. 4월 30일과 5월 10일 파종에서 수수가 많아 10a당 쌀수량이 485-494 kg으로 다른 시기 보다 증수되었으며, 품종별로는 5월 10일 파종의 동안벼가 513 kg으로 가장 많았다. 3. 완전미비율은 5월 10일 파종이 90.4%로 가장 높았고, 5월 30일 파종은 83.1%로 가장 낮았다. 4. 품종별 완전미비율은 5월 10일 파종한 대산벼에서 92.1%로 가장 높았으며, 4월 20일과 5월 30일 파종한 광안벼에서 각각 동할미 및 청미의 비율이 높아 완전미비율은 78.8%로 낮았다. 5. 회귀식에 의한 적정파종기는 호안벼는 5월 10일, 동안벼는 5월 3일, 농호벼는 5월 8일, 광안벼는 5월 1일, 대산벼는 5월2일이었다.