• Title/Summary/Keyword: 이앙시기

Search Result 255, Processing Time 0.038 seconds

Comparison of Rice Stripe Disease Occurrence and Yield under Different Rice (Oryza sativa L.) Cultivars (이앙시기에 따른 벼 품종별 줄무늬잎마름병 발생 및 수량 비교)

  • Cha, Kwang-Hong;Oh, Hwan-Jung;Park, Heung-Gyu;Jung, Woo-Jin
    • Korean Journal of Organic Agriculture
    • /
    • v.18 no.1
    • /
    • pp.75-82
    • /
    • 2010

  • The purpose of this study is to investigate an occurrence rate of rice stripe virus disease under different rice transplanting time and different rice cultivars. After final harvest, the yield of rice infected by rice stripe virus was obtained on Wangchal cultivar compared to uninfected rice. The results obtained as following: 1) Yield of rice infected by rice stripe virus was decreased by 64% with reduction of culm length, pancile length, number of spike, number of spikelet, and grain filling compared to uninfected rice, 2) An occurrence rate of rice stripe virus disease under different rice planting season was high as order of May 30 > June 15 > July 1. In additional, to reduce a rice stripe virus disease on higher disease occurrence region and susceptible cultivars, rice planting season will be accepted on and after June 15, and 3) Eighteen cultivars were resistance cultivars such as Hwayeongbyeo, Onnuri, Ilmibyeo, Nampyongbyeo, Dongjin2ho, Hopumbyeo, Hwangkeumnuri, Malgeumi, Saenuri, Pungmi1ho, Haechanmulgyeo, Hwangkeumnodeul, Chilbobyeo, Dongjinbyeo, Younganbyeo, Junambyeo, Samkwangbyeo, and Nakdongbyeo. Twenty-one cultivars were susceptible cultivars such as Odaebyeo, Unkwangbyeo, Shinungbong1ho, Manabyeo, Hopyongbyeo, Borami, Damibyeo, Hwangchalbyeo, Sulgengbyeo, Nongrim6ho, Sasanishigi, Yunishigari, Chungmubyeo, Dongjin1ho, Huknambyeo, Guromy, Shanghehanghulna, Heukchalbyeo, Heukhwangbyeo, and Aranghwangchalbyeo.

  • PDF KSCI

Transplanting Date and Planting Density Affect the Growth Characteristics and Seed Yield of Italian Ryegrass (이앙 시기와 재식 밀도에 따른 이탈리안 라이그라스의 생육 및 종실 수량 특성 평가)

  • Yun-Ho Lee;Jeong-Won Kim;Hyeok-Jin Bak;Hyun-Ki Kim;Hyeon-Soo Jang;Dea-Yuk Kim;Jong-Tak Yoon
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.68 no.4
    • /
    • pp.438-444
    • /
    • 2023

  • Italian ryegrass (Lolium multiflorum Lam.; IRG) sowing season is delayed due to the autumn rainy season. Therefore, to address this problem, transplanting date and plant density were investigated. Transplant times investigated were October 20th, October 30th, and November 10th and planting densities were 50, 70, and 80 hills per 3.3 m2. The plant height, leaf area index, and plant coverage rate were high in the following order: October 20th, October 30th, and November 10th. There was no significant difference among planting densities. In addition, the number of tillers and dry weight before and after wintering were high on October 20th. In terms of yield components, the number of tillers, dry weight, and seed yield per unit area were higher with the transplanting date of October 20th than with transplanting on November 10th. There was no difference in seed yield between the planting densities of 80 and 70 hills per 3.3 m2. However, seed yield was low at 50 hills per 3.3 m2. In conclusion, the transplanting time for stable seed production is late October, and optimal plant density is 70 and 80 hills per 3.3 m2. A stable interplanting number before wintering will contribute to the seed yield.

  • https://doi.org/10.7740/kjcs.2023.68.4.438 인용 PDF

Analytical Studies on the Rice Yield Component and Yield in South Region of Korea I. Variation in the Rice Yield Component and Yield under the Different Transplanting Dates. (남부지방에 있어서 수도수량구성요소 및 수량해석I. 재배시기에 따른 주요형질 및 수량의 변이)

  • 김용재;김규진
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.29 no.3
    • /
    • pp.209-217
    • /
    • 1984

  • This study was conducted to establish fundamental of rice cultivation system in the southern warm region of Korea by investigation of variation of yield component factor and yield under the different transplanting dates which was at interval of 15 days, from May 20 to July 5. In the variation of leaf age, the leaf of July 5 transplanting was less 1.1 leaves than that of May 20 transplanting in Seokwang. However in Dongjin, the leaf of May 20 transplanting was more 1.7 leaves than that of July 5. According to transplanting date delay, the shorten ratio of flag leaf was showed an increasing tendency. Period from transplanting to heading under the different transplanting in Seokwang, required about 75 days in May 20 transplanting and 68 days in June 5, 67 days in June 20, but 71 days in July 5, it was a cause of decrease in grain yield, because of increase in the period from transplanting to heading date. The maximum yield under the different transplanting gathered on May 20 transplanting in Seokwang variety, and on June 20 transplanting in Dongjin variety, and then, on the accumulated temperature 1017$\pm$24$^{\circ}C$ in Seokwang, 952$\pm$15$^{\circ}C$ in Dongjin, from 10 days before heading to 30 days after heading, it was appeared the high yield. It was showed linearly negative correlation between the No. of panicles per unit area and transplanting date (Seokwang; r=-0.6768$^{**}$, Dongjin: r=-0.5182$^{**}$). There were more differentiation of spikelets per panicle in the late transplanting in Seokwang, however in Dongjin, it was decreased in differentiation of spikelets per panicle in the early and the late transplanting.ing.

  • PDF