• 한국잡초학회지
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• 제17권2호
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• pp.139-146
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• 1997

벼 직파재배답(直播栽培畓)의 효과적인 방제체계(除草體系)를 확립(確立)하기 위한 기초자료(基礎資料)를 얻고자 직파재배유형별(直播栽培類型別) 잡초발생생태(雜草發生生態)를 구명(究明)하기 위하여 수행한 시험결과를 요약하면 다음과 같다. 1. 건답직파재배답(乾畓直播栽培畓)에서는 생육초기(生育初期)에 피 바랭이 냉이 강아지풀 등 밭잡초의 발생이 많았으나 생육이 진전됨에 따라 올방개 사마귀풀 너도방동사니 등이 우점(優占)하였고, 담수직파(湛水直播)에서는 건답직파(乾畓直播)에 비하여 피의 우점도(優占度)가 낮았으며 물달개비와 사마귀풀이 우점(優占)하였다. 2. 잡초발생량(雜草發生量)은 건답직파(乾畓直播)가 담수직파(湛水直播)에 비해 1.8~2.4배 많았으며, 파종시기(播種時期)가 늦을수록 증가하였고, 단위기간당(單位期間當) 잡초발생량(雜草發生量)의 증가율(增加率)은 직파유형(直播類型)이나 파종시기(播種時期)에 관계없이 파종후 20일에서 40일 사이에 가장 높았는데, 파종시기(播種時期)가 늦어질수록 증가율(增加率)이 낮아졌다. 3. 일년생잡초(一年生雜草)의 발생비율은 건답직파(乾畓直播)보다 담수직파(湛水直播)에서 높은 반면 다년생잡초(多年生雜草)는 담수직파(湛水直播)에서 발생이 많았고, 파종시기(播種時期)가 늦어질수록 일년생잡초(一年生雜草)의 발생은 감소하고 다년생잡초(多年生雜草)는 증가(增加)하였다. 4. 잡초발생(雜草發生)의 Simpson지수(指數)는 건답직파(乾畓直播)가 담수직파(湛水直播)에 비하여 높았으며, 생육시기 별로는 초기에 비하여 생육이 진전될수록 특정초종(特定草種)의 우점(優占)으로 점차 높아졌다. 5. 잡초발생량(雜草發生量)은 직파유형간(直播類型間)에 통계적인 차이가 있었고, 파종시기(播種時期)에 의해서도 유의성이 인정되었으며, 직파유형과 파종시기간에는 교호작용(交互作用)의 효과(效果)가 있었다.

• 한국작물학회지
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• 제50권3호
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• pp.175-178
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• 2005

국제미작연구소(IRRI)의 IRGC와 INGER유전자원에 대한 직파적성을 평가하기 위하여 다양한 직파조건으로 처리된 20개 시험에서 공통으로 공시된 대비품종군(8개 품종) 직파조건에 대한 입모반응을 검토하여 품종들의 유전적 특성으로 평가하고자 시험한 결과를 요약하면; 1. 직파조건에 따른 입모율의 품종, 파종시기, 이들의 상호작용 및 모든 처리간에 통계적인 유의성이 인정되었다. 2. 직파양식, 복토깊이, 파종기 등의 직파조건별 대비품종군의 품종간 입모반응은 거의 같은 경향으로 나타나서 품종의 특성으로 분류할 수 있었다. 3. 직파조건에 따른 평균 입모율의 품종간 차이는 ASD1 > IR50 > IR72 > Taothabi > Uplri5 > CO25 > Dula > Moroberakan순으로 높게 나타났다. 4. 건답직파(파종깊이 25mm, 50mm)에서 파종시기에 따른 입모율의 품종 간 차이는 ASD1과 Moroberakan 품종 간에는 모든 직파조건에서 유의한 차이를 보였으나 다른 품종들은 직파조건에 따라서 유의성 정도가 다소 상이하여 평균 입모율의 순서와 같은 경향이었다.

• 한국작물학회지
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• 제44권1호
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• pp.44-48
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• 1999

Uptake, assimilation and translocation of nitrogen and dry matter assimilation and translocation in ten rice cultivars were observed in no-till direct-sown rice-vetch cropping system. There was a large degree of variation in N-uptake, grain yield, nitrogen translocation efficiency and dry matter assimilation and translocation in tested rice cultivars. Forty kg N/ha base, as compound fertilizer (21-17-21% of N-P-K) three weeks after sowing and 30 kg N/ha top-dressed at panicle initiation stage as in the form of (NH$_4$)$_2$$CO_2$ was applied. ‘Newbounet’, ‘Daesanbyeo’, and ‘Hwayeongbyeo’ showed higher translocation efficiency. The contribution of pre-heading dry matter assimilates to grain ranged from 33% to 99% of dry grain weight. Dry matter of ‘Calrose 76’ was lower than Newbounet but N content was higher in Calrose 76 than Newbonnet. By maturity, N content in vegetative parts declined considerably more than dry matter, vegetative and reproductive parts, N translocation efficiency, and N harvest index. Nitrogen translocation efficiency was greater in ‘Nonganbyeo’, Daesanbyeo, and Newbounet. Grain N concentration was positively correlated with N concentration or N content of the vegetative parts at heading in Nonganbyeo, ‘Dasanbyeo’, ‘Dongjinbyeo’, and Newbonnet. These results indicated that the greater amount of dry matter and N accumulated before heading stage, the higher translocation rates of dry matter to grain and the greater net losses at maturity.

• 한국잡초학회지
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• 제12권3호
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• pp.200-222
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• 1992

The results of recent researches for improvement of seedling stand in direct seeded rice on the dry paddy in Korea were summarized as the following ; a variety to be cultivated should be chosen the characteristics of high percentage germination under low temperature, shorter period of shoot emergence, and better growth of the mesocotyl and shoots. Meanwhile, there was 40% increase in seedling stand at the treatment of removal of the seed awn under using the drill seeder. After seeding the rice seed covered with soil of 3cm depth was better seedling emergence and also there was the hightest seedling emergence at the 70% of moisture content of the soil. In addition, the application of the Release containing GA 10% enabled to increase the seedling stand and furthermore it was effective under deep seeding depth. The optimum seeding date should be seeded around May 10 when mean air temperature is above 12-13$^{\circ}C$ so that may establish more less 70% in seedling stand. Based on an appropriate seedling stand of 150/$m^2$, the optimum seeding rate was 5kg/10a. It was the best in seeding method using drill seeder and the most desirable recommended seeding method was the drill seeder in terms of seedling stand. In order to improve seedling stand water management was more effective in canal irrigation and in drainage at 6hr after irrigation following by the seeding process. On the other hand, for the increase of seedling stand under flooded condition a variety might have characters being better germination at low concentration of dissolved oxygen and vertically deeper growing of the crown root. Also, seedling stand was able to increase with the seed coating of $CaO_2$in the flooded soil. It was possible to be seeded on the early part of May being mean air temperature of avove 10$^{\circ}C$ and the optimum seeding rate was 5kg/10a. For an effective water management water would be flooded up to 3cm depth for 2-3 weeks after seeding. The rice plant grown under the direct seeded cultivation might be not so much strong in lodging resistance compared to that grown under the transplanting and moreover direct seeded rice cultivation under flooded condition would be more weak growth of the rice plant than that on dry paddy. Meanwhile, the lodging would be affected by the seeding rate, the soil depth after seeding. and seeding method even in the same variety. In particular, roots in the lodging pattern of direct seeded rice cultivation under flooded condition were largely distributed on the soil surface so that resulted easily in the lodging. In general, the lodging resistance would be greater as seeding rate and amount of N fertilizer application are lower and soil depth after seeding is higher. Among the introduction of different seeding method the high ridged drill seeding method on dry paddy soil resulted in the lowest in the lodging index and also it was lower in the drill seeding method than in the scattering seeding method under flooded condition. In case of more than 150 seedlings per $m^2$ there was a severe lodging due to high lodging index at the 3rd and 4th internodes. The effective lodging prevention was able to at the treatment of the Inabenfide at 45 days before heading and the Uniconazol at 15 days before heading which caused the shortage by 10-15cm in culm length. Also, fertilizer management using split application of nitrogen would be contributed the reduction of lodging at the rate of 20-30-20-20-10%(basal-5th leaf stage-7th leaf stage-panicle initiation stage-heading stage) on the dry paddy soil.

• 한국잡초학회지
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• 제2권2호
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• pp.141-145
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• 1982

IAA의 종자침지처리(種子浸漬處理)에 의하여 수도(水稻)에 대한 CNP와 Butachlor의 약해(藥害)를 경감(輕減)시킬 수 있는 가능성(可能性)을 검토(檢討)하기 위하여 담수직파(湛水直播)와 건답직파조건(乾畓直播條件)에서 기초실험(基礎實驗)을 수행(遂行)하였다. 1. 담수직파조건(湛水直播條件)에서 IAA 0.1, 1.0, 10.0ppm 에 수도종자(水稻種子)를 침지처리(浸漬處理)하므로써 CNP와 Butachlor에 의한 수도피해(水稻被害)의 경감효과(輕減効果)가 나타남에 따라 수도(水稻)의 초장(草長) 및 건물중(乾物重)은 IAA 무처리(無處理)에 비하여 현저히 증가(增加)되었다. 2. 건답직파조건(乾畓直播條件)에서는 IAA 0.1, 1.0ppm에 수도종자(水稻種子)를 침지처리(浸漬處理)하므로써 수도(水稻)에 대한 CNP와 Butachlor의 피해(被害)는 크게 경감(輕減)되었다. 3. 담수조건(湛水條件)에서 Butachlor를 처리(處理)하거나 건답직파조건(乾畓直播條件)에서 CNP를 처리(處理)한 경우에 IAA의 약해경감효과(藥害輕減効果)는 더욱 현저한 경향(傾向)이었다.

• 한국잡초학회지
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• 제14권2호
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• pp.144-155
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• 1994

재배양식(栽培樣式)을 달리하여 생육하는 벼와 피의 줄기 표면(表面) 및 최외곽(最外廓) 표피세포(表皮細胞)의 미세구조(微細構造) 차이(差異)를 파악하여 제초제(除草劑) 사용원리(使用原理)와 잡초방제요점(雜草防除要點)을 연관지어 밝히고자 주사전자현미경(走査電子顯微鏡)(SEM)과 투사전자현미경(投射電子顯微鏡)(TEM)을 이용(利用)하여 연구(硏究)한 결과(結果)를 요약(要約)하면 다음과 같다. 1. 줄기의 표면구조(表面構造) 차이(差異) 가. 건답조건(乾畓條件)에서는 표면(表面)벼와 토중(土中)벼간에 차이(差異)가 인정되지 않았으나 표면(表面)벼가 토중(土中)벼에 비하여 더 매끄러운 표면(表面)을 형성하였다. 건답직파(乾畓直播)는 최외부층의 납질(蠟質)구조가 아령모양(啞鈴模樣)을 하고 있으며 기공열(氣孔列)과 규산세포열(硅酸細胞列)이 있으나 피는 납질(蠟質)이 실모양이며 모용, 기공열(氣孔列) 및 규산세포열(硅酸細胞列)은 없었다. 나. 담수직파(湛水直播)된 벼 줄기표면(表面)은 미분화(未分化)된 조직(組織)의 상태(狀態)를 나타내며 모용, 규산세포열(硅酸細胞列) 및 기공열(氣孔列)이 발견되지 않았다. 다. 이앙후(移秧後) 8일(日) 및 25일(日)된 묘(苗)의 표면구조(表面構造)는 건답직파(乾沓直播)벼의 구조(構造)보다 기공열(氣孔列), 규산세포열(硅酸細胞列), 납질(蠟質) 및 모용의 발달(發達)이 더 많았다. 2. 최외부(最外部) 세포벽구조(細胞壁構造) 차이(差異) 가. 최외부(最外部) 납질(蠟質)두께는 이앙(移秧)벼가 가장 두꺼웠고 건답(乾沓)벼가 피나 담수(湛水)벼보다 2~6배 두꺼웠다. 나. 벼의 큐티클층(層)은 이앙(移秧)벼와 건답(乾沓)벼보다는 담수(湛水)벼가 두꺼웠으나 반대로 담수(湛水)피보다는 건답(乾沓)피가 두꺼웠고 전반적으로는 피보다 벼가 더 두꺼웠다. 다. 세포벽(細胞壁)은 이앙벼가 가장 두꺼웠고 피보다는 벼가, 건답(乾沓)벼보다 담수(湛水)벼가 그리고 건답(乾沓)피보다 담수(湛水)피가 두꺼웠다.

• 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.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.103-103
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• 2017

Vigorous root growth at the seedling stage in dry direct-seeded conditions is considered as a critical trait because it is involved in seedling emergence, early vegetative vigour, nutrient uptake as well as drought tolerance. In this study, we performed QTL mapping using the recombinant inbred lines obtained from the cross between Tongil-type Dasan and temperate japonica TR22183 (DT-RILs) to identify QTL underlying early root development. TR22183, which was previously reported to have high nitrogen utility and cold tolerance, showed vigorous root growth at the seedling stage in semi-drought conditions. Root length, fresh weight and dry weight of TR22183 were significantly higher than in Dasan. By QTL analysis with genotyping-by-sequencing method, we identified two QTLs for root fresh weight (RFW) in chromosome 7 and root dry weight (RDW) in chromosome 8, explaining phenotypic variances of 13.5% and 10.6%, respectively. These QTLs would be used to develop rice varieties adapted to direct-seeded cultivating system.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.186-186
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• 2017

Relay intercropping system of direct seeded rice and winter cereal is labor saving cultivation and has high land use efficiency in Japan. In this system, rice seeds are direct seeded into inter-row space of winter cereals (wheat or barley) in March or April. If the direct seeding of rice is conducted before stem elongation phase or using suitable seeder, these are little effect to yield of winter cereals. Though the seeds are generally thiuram treated, it's a matter that seedling establishment rate (SER) of direct seeded rice is low and unstable. The cause of low SER has not been revealed. In present study, with the aim to reveal causes of low SER, we conducted experiments and investigated the SER, and analyzed some factors that might affect SER. Experiment1: In 2015, 2016, we buried rice seeds underground, and investigated the transition of the seed survival rates (SSR). Seeds were thiuram-treated or non-treated. In 2 periods, SSR of thiuram-treated seeds were significantly higher than non-treated seeds. In 2016, thiuram-treated seeds were high in SSR (almost 75%) at April 30th, but low SER (10~27%) after harvest of winter cereals. Therefore, almost all of seed death might have been happen after germination. Analysis 1: We investigated the SER and cultivation conditions in Ibaraki pref. for several years. Meteorological factors were referred from the nearest point of AMeDAS. From mean temperature (MT) among 5days after and before the day, we divided the period of seeding ~June 20 to phase1~4. We defined each phase as below; Phase1: $MT{\leq}10^{\circ}C$, Phase2: $10^{\circ}C<MT{\leq}15^{\circ}C$, Phase3:$15^{\circ}C<MT{\leq}20^{\circ}C$, Phase4: $MT>20^{\circ}C$. We analyzed the correlation of SER and meteorological factors by each phase. Total number of days in phase 1~4 was significantly negative correlated with SER. In phase1, total rain fall and number of soil wetting days were significantly negative correlated with SER. In phase2~4, only MT was significantly positive correlated with SER. This result suggested that rainfalls in phase1 declined seed vigor to emergence from soil surface, by repeated water absorption and re-dry. From these present studies, it was suggested that one of factors of low SER of direct seeded rice in relay intercropping system is changing of water condition by rainfalls in phase1 ($MT{\leq}10^{\circ}C$). To improve SER, it's necessary to consider something seed treatments such as prevent water absorption during phase1. However, 58~60% of seeds seemed to die during May. It's suggested that, if seeds are thiuram treated, almost all of seeds can germinate underground, but the seed vigor to emergence from soil surface are insufficient. Further studies are needed to reveal the rest causes that is happening during emergence from soil surface.

• 한국작물학회지
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• 제46권2호
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• pp.84-88
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• 2001

Two methods of nitrogen application at the 4th leaf stage were evaluated in direct-seeding rice cultivation on dry paddy soil: one was the top dressing of nitrogen on dry paddy condition before irrigation (TNDP) for labor saving, and the other was the top dressing of nitrogen on dry paddy with mechanical rotavation of the inter-row space (TNDPIR) for increasing the efficiency of nitrogen. To evaluate these two application methods, leaf chlorophyll contents, growth characteristics and yields were compared with two conventional methods, basal application (BA) and top dressing on flooded paddy condition at the 4th leaf stage (TNFP). The SPAD value of rice in TNDP was similar with that in TNFP throughout the whole growth stage of rice. Also, there were no differences in rice growth and yield between the two methods. However, in TNDPIR, the SPAD value was the highest during tillering stage among the four application methods, and the tiller number, LAI at heading stage and the panicle number were higher than the two conventional methods.