• Title, Summary, Keyword: Midsummer drainage

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Midsummer Drainage Effects on Rice Growth and Golden Apple Snails in Environment-friendly Rice Cultivation (왕우렁이를 이용한 벼 친환경재배포장에서 벼와 왕우렁이 생장에 대한 중간낙수 효과)

  • Hwang, Ki-Cheol;Ahn, Seok-Hyun;Chung, Nam-Jin
    • Korean Journal of Organic Agriculture
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    • v.21 no.3
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    • pp.403-411
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    • 2013
  • This study was performed to examine whether it is possible to promote rice growth by midsummer drainage without damage of golden apple snails in environment-friendly rice farming. The effect of drainage on the life of snails was examined in a greenhouse before the filed experiment. Spats (young shells) of snails survived 100% at 12 days after drainage, and 93.3% at 15 days after drainage. The midsized shells survived 100% at 9 days, 93.3% at 12 days, and 86.6% at 15 days after drainage. In the field experiment, 10-days drainage did not affect the snail population and there was no significant difference of weeding activity of snails between the midsummer drainage treatment and the continuous submerged treatment. The plant height and the effective tiller number in the midsummer drainage treatment were higher than those of the continuous submerged treatment. The rice yield of midsummer drainage plot was 511kg/10a, which was 66kg/10a higher than 445kg/10a of continuous submerged plot. In conclusion, midsummer drainage could increase rice growth and yield without damage of golden apple snails in the environment-friendly rice farming.

Functional Evaluation of Small-scale Pond at Paddy Field as a Shelter for Mudfish during Midsummer Drainage Period (논 중간 낙수기에 미꾸라지 피난처로서 둠벙의 기능 평가)

  • Kim, Jae-Ok;Shin, Hyun-Sang;Yoo, Ji-Hyun;Lee, Seung-Heon;Jang, Kyu-Sang;Kim, Bom-Chul
    • Korean Journal of Environmental Agriculture
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    • v.30 no.1
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    • pp.37-42
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    • 2011
  • BACKGROUND: The purpose of this study was to evaluate ecological function of small-scale pond and movement characteristics of mudfish (Misgurnus mizolepis) during midsummer drainage period. METHODS AND RESULTS: In situ experiments were performed in the paddy field with mudfish under the condition of midsummer drainage from 13 July to 29 July 2010. The mudfish used in this experiment is approximately 1,000 individuals with a cut tail. Mudfishs were released in the rice field before midsummer drainage and caught again in the small-scale pond and the paddy field after midsummer drainage. Results showed that the abundance of mudfish was higher in drainage canal than small-scale pond at the early stage of midsummer drainage, because flow was formed toward the drainage canal. In that time, 3% of the total marked mudfish were captured at outlet of drainage canal. As the paddy was drying, 5% of total marked mudfish moved to the small-scale pond during midsummer drainage period. Contrary to the general hypothesis, the marked mudfish was not found in holes in paddy field.of total caught in the small-scale pond ingested mainly animal prey, and it's frequency of empcy stomach was 10%.oOn the other hand, all m total collected in the paddy field showed empcy stomach. It was apparent from the experiment that m total are eeldng normally in the small-scale pond, while m total are not eat properly in paddy field. CONCLUSION(s): As the paddy was drying, mudfish moved to the small-scale pond during midsummer drainage period but mudfish was not found in holes in paddy field. It can be concluded that small-scale provides a shelter and prey to mudfish in the midsummer drainage period.

Influence of Midsummer Drainage on Growth and Lodging of Rice in Direct Seeding on Dry Paddy (벼 건답직파 재배시 중간낙수가 생육 및 도복에 미치는 영향)

  • 최민규;김상수;이선용;최선영
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.40 no.5
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    • pp.574-579
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    • 1995
  • To investigate the effect of the midsummer drainage method on growth and lodging characters, Dongjinbyeo was direct seeded on dry paddy field under 4cm of soil depth at May 1 by seeding machine. Three kind of drainage methods were treated such as, once in 20day, towice in 20, 30 days and 3 times 20, 30, 40 days after flooding. As increase the drainage times, the culm and internode length were shorter, culm wall of 4th internode was thicker, breaking weight was heavier, height of center weight was lower, lodging index was reduced, and dry weight of root was increased. Field lodging occured seriously at none drainage but didn't, with two or three times of drainage. Grain yield was not shown significantly different compared with constant flooding irrespective of midsummer drainage times. Therefore two or three times of midsummer drainage could be recommended as the effective water management for the reduction of lodging occurance in direct seeding culture on dry paddy field.

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Growth and Lodging of Rice as Affected by Growth Regulators under Different Midsummer Drainage Times in Puddled-soil Drill Seeding (벼 무논골뿌림 재배시 중간낙수 및 생장조절제 처리가 생육 및 도복에 미치는 영향)

  • 김상수;백남현;이선용;김종호;조동삼
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.40 no.6
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    • pp.697-704
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    • 1995
  • This experiment was carried out to elucidate the effect of the midsummer drainage times and some growth regulators on lodging characters, lodging and yield in puddled-soil drill seeding in rice. Dongjinbyeo, the mid-late maturing rice variety was seeded at May 11 by seeding machine with 4cm of furrow depth. Experimental plots were divided two main treatment without midsummer drain and two time drains (30 and 50 days after seeding), Inabenfide(IBF) was applied 40days before heading(DBH) and IBP was applied at 30DBH, respectively. Culm length was shorten, the wall of N$_4$ was thicken, and the breaking weight was increased at two time drainage and growth regulators applied in order of Inabenfide, IBP, and Control. Lodging wasn't occurred at two time drainage but it was occurred at none drainage in the order of Control, IBP, and Inabenfide applied. Yield was higher at two time drainage compared with none drainage and higher in order of Inabenfide, IBP and Control in none drainage but wasn't significantly different among growth regulators applied in two time drainage. Therefore, two times midsummer soil drying is recommendable management method for puddled -soil drill seeding of rice. Rice, Direct seeding, Puddled-soil, Drill seeding, Midsummer drainage, Growth regulator, Lodging.

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Effects of Growth Retardants on Lodging-related Traits in Direct Seeded Rice on Flooded Paddy Surface

  • Ju, Young-Cheoul;Park, Jung-Soo;Han, Sang-Wook;Park, Kyeong-Yeol;Rho, Young-Deok
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.44 no.3
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    • pp.248-252
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    • 1999
  • This study examined the effects of growth retardants and midsummer drainage on lodging-related characters in direct seeding rice culture on flooded paddy surfaces. Treatments included in this study were continuous flooding, two time midsummer drainages (TTD), and inabenfide or trinexapac-ethyl application after TTD. Culm length was reduced most by 11.4cm in trinexapac-ethyl treatment after TTD, followed by 4.1cm in inabenfide treatment after TTD compared to TTD treatment. A significant reduction in culm length occurred at the 3rd internode in inabenfide treatment applied at 40 days before heading (DBH), while trinexapac-ethyl application at 8 DBH reduced the 3rd>2nd>1st internode. The culm diameter of the 4th internode was increased by the application of trinexapac-ethyl following TTD compared to TTD treatment. Thickness of culm wall was significantly increased by trinexapac-ethyl but not by inabenfide applications. Lodging index was the highest in continuous flooding and the lowest in trinexapac-ethyl treatment after TTD. Subsequently, field lodging did not occur in plots treated by trinexapac-ethyl. Rice plants subjected to midsummer drainage or growth retardants showed higher ripened grain ratio and 1000-grain weight, resulting in higher rice yield. These results indicate that trinexapac-ethyl, which can be applied at the relatively later growth stage after proper judgement of lodging occurrence, could be a useful tool for reducing lodging in direct seeding rice culture on flooded paddy fields.

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Effect of SRI Water Management on the Reduction of Greenhouse-gas Emissions and Irrigation Water Supply in Paddy (논에서 SRI 물관리 방법에 의한 온실가스와 관개용수 저감효과 분석)

  • Seo, Jiyeon;Park, Baekyung;Park, Woonji;Lee, Suin;Choi, Yonghun;Shin, Minhwan;Choi, Joongdae
    • Journal of The Korean Society of Agricultural Engineers
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    • v.60 no.1
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    • pp.79-87
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    • 2018
  • Water management impacts both methane ($CH_4$) and nitrous oxide ($N_2O$) emissions from rice paddy fields. Although irrigation is one of the most important methods for reducing $CH_4$ emission in rice production systems it can also $N_2O$ emissions and reduce crop yields. A feasibility study on the system of rice intensification (SRI) methods with respect to irrigation requirements, greenhouse gas (GHG) emissions was conducted for either 2 or 3 years depending on the treatment in Korea. The SRI methods (i.e. SRI and midsummer drainage (MD) with conventional practice (CT)) reduced the irrigation requirement by 49.0 and 22.0 %, respectively. Global warming contribution of GHG to different depending on the type of GHG. Therefore, the emission of $CH_4$ and $N_2O$ shall be converted to Global Warming Potential (GWP). The GHG emission from the conventional practice with midsummer drainage (MD) and the SRI plots, in GWP were reduced by 49.1 and 77.1 %, respectively. Application of SRI water management method could help to improve Korea's water resources and could thus contribute to mitigation of the negative effects of global warming.

A Survey on Irrigation Timing and Water Saving Strategies of Agricultural Reservoirs (농업용 저수지 관재용수 공급시기 및 절수 방법 기초자료 설문조사 분석)

  • Nam, Won-Ho;Choi, Jin-Yong;Choi, Soon-Goon;Jang, Min-Won;Lee, Nam-Ho;Ko, Kwang-Don
    • KCID journal
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    • v.18 no.1
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    • pp.81-93
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    • 2011
  • Agricultural reservoirs importantly role for paddy rice cultivation with about 18,000 numbers, so that understanding of operational rules for the reservoirs is quite meaningful for proper irrigation water supply. In this study, a survey was conducted to investigate a key reservoir operational elements over nationwide. The target reservoirs are mainly operated by KRC (Korea Rural Community Corporation) and 221 water management persons in province office of KRC were involved in this survey. The key reservoir operational elements including starting and ending time for irrigation, transplanting water supply periods, midsummer drainage periods and drought response strategy were surveyed. The results of this study demonstrated that the key elements for reservoir operation depend on weather, rice variety and cultivation conditions.

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