• Title/Summary/Keyword: 건답

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Effects of IAA Seed Pretreatment on Reduction of CNP and Butachlor Injury to Rice (IAA의 종자침지처리(種子浸漬處理)가 CNP와 Butachlor에 의한 수도약해(水稻藥害)의 경감(輕減)에 미치는 영향)

  • Pyon, J.Y.;Kwon, Y.W.;Lee, E.W.
    • Korean Journal of Weed Science
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    • v.2 no.2
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    • pp.141-145
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    • 1982

  • In order to determine the possibility of reducing rice injury caused by CNP and butachlor application, the effects of IAA seed presoaking on CNP and butachlor action against early growth of rice seedlings were investigated under flooded direct-seeding and dry-seeded conditions. CNP and butachlor injury to rice was reduced by soaking rice seeds at 0.1, 1.0 and 10ppm of IAA solution for 36 hours before seeding under flooded condition and thus shoot length and dry weight of rice seedlings increased compared with those of IAA untreated seedlings. IAA seed pretreatment also overcame the inhibitory effect of CNP and butachlor under dry-seeded condition. Effect on reducing rice injury by IAA pretreatment was more remarkable when CNP applied under dry seeded condition and butachlor under flooded condition.

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Effect of Recycled Paper Mulch on Weed Occurrence and Yield in Dry-seeding Rice Culture (건답직파재배(乾畓直播栽培)에서 재생지(再生紙) 멀칭에 따른 잡초발생(雜草發生)과 벼의 생육(生育) 및 수량(收量))

  • Lee, Byun-Woo;Cui, Ri Xian
    • Korean Journal of Weed Science
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    • v.18 no.4
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    • pp.281-285
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    • 1998

  • This experiment was carried out to evaluate the effect of recycled paper mulch on weed occurrence and the growth and yield of rice in dry-seeded paddy field. Mulch papers with basis weight of 105, 110, 115g/$m^2$ were fabricated from recycled corrugate container. It took about 80 days after mulching for the mulch papers to reach 50% decomposition, showing no significant differences among types of mulch paper. Paper mulching was very effective in controlling the paddy weeds at early stage of rice growth, but the efficacy of weeds control decreased a little at late season. However the efficacy was still higher than the plot using herbicide. The paper mulch plot showed rice yield similar to the weed control plot using herbicide. It could be concluded that paper mulch can be used as an alternative for non-herbicidal weed control and ensure as high yield as the conventional weed control method using herbicide in dry-seeded rice field.

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Weed Occurrence in Paddy-Upland Rotating Field (답전윤환재배지(畓田輪換栽培地)에서의 잡초발생동태(雜草發生動態))

  • Kim, K.U.;Shin, D.H.;Park, S.J.;Jeong, J.W.;Yeo, M.H.
    • Korean Journal of Weed Science
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    • v.15 no.4
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    • pp.305-312
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    • 1995

  • Weed communities in the dry-direct seeded rice(Oryza sativa L.), soybean(Glycine max(L.) Merr.), and dry-direct seeded rice-soybean rotation system from the transplanted rice field were investigated in order to identify a change in weed species by paddy-upland rotation. Echinochloa species was the most dominant species in the dry-direct seeded rice and their great increase was observed in the continued practices of dry-direct seeded rice. Echinochloa spp., Chenopodium ficifolium, and Digitaria spp. were identified as the major weeds in soybean cultivation in paddy field. Practice of soybean rotation in the dry-seeded rice reduced weed occurrence, particularly at the soybean after 2-yr continued dry-direct seeded rice and at dry-direct seeded rice culture after 2-yr continued dry-direct seeded rice and at dry-direct seeded rice culture after 2-yr soybean compared to the continued cultures of rice or soybean. In addition, cultivation of dry-direct seeded rice or soybean culture in the paddy rice field seemed to be helpful for suppression of perennial weeds(Eleocharis kuroguwai, Cyperus serotinus, Scirpus juncoides) and aquatic weeds(Monochoria vaginalis, Sagittaria spp. Potamogeton distinctus).

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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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Occurrence of Small Brown Plantopper (Laodelphax striatellus Fallen) and Incidened of Rice Viwus Disease by Different Seting Date in Dry Seeded Rice (벼 건답직파시기에 따른 애멸구 및 바이러스병 발생)

  • 배순도;김동길
    • Korean journal of applied entomology
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    • v.33 no.3
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    • pp.173-177
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    • 1994

  • his study was conducted to Investigate the occurrence of small brown planthopper (SBPH), LaodeIpahx striatellus Fallen, and the ind~cence 01 rice virus diseases by d~fferent seeding dates in dryseeded rice. The occurrerlce of SBPH was the highest an nce seeded in May 11, followed byMay 1, May 21 and May 31. However. SBPH dld not occur on the rice seeded in June 10 duelo the rice was emerged after peak occurrence of first generailon adult of SBPH. The occurrenceof the first generation adult of SBPH was May 11 and it was 3-day earlier than that of infantnce transplanting. The ~nd~cencofe rice vlrus diseases, rice stripe vilus (RSV) and rice black-streakeddwarf virus (RBSDV), was the most severe at seeding date May 11. and then followed by May1, May 21 and May 31 Thus the incidence of "ce virus diseases was closely related with thedensity of the first generat~on adult of SBPH Rice yield was decreased by later seeding dates, although rice yield from May 1 to May 21 was relatively stable and hqii compared with laterseeding dates. Accordingly, there was slgniilcant relatlonsh~p between rice yield and seeding datesice yield and seeding dates

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