• Title/Summary/Keyword: Rice tillering

Search Result 265, Processing Time 0.026 seconds

Duration of Competition and the Competitive Ability of Red Rice with Rich by Replacement Diagram (적미(赤米)의 경합기간(競合期間)과 밀도(密度)가 수도생육(水稻生育) 및 수량(收量)에 미치는 영향(影響))

  • Ree, D.W.;Kim, J.C.;Kim, Y.H.;Hong, Y.K.;Son, S.Y.
    • Korean Journal of Weed Science
    • /
    • v.7 no.1
    • /
    • pp.45-51
    • /
    • 1987

  • This experiment was conducted to find out the critical competitive period and competitive ability of rice against red rice. Plant height and number of tillers of rice decreased as red rice competed with rice during active tillering stage. The maximum tillering stage of rice competed with red rice became about 10days earlier than those non-competed. Significant yield reduction of rice was observed in the plots competed for 20 days after transplating or longer. Such a yield reduction can be mainly attributed to the decrease in number of panicles per hill and grain number per panicle. In a replacement diagram for rice and red rice, their competition is turned out being antagonized. The relative yield total was considered lower than 1. Grain number, culm and panicle length of rice was not affected significantly by inter-specific competition. Rice grain yield reduction was highly correlated with the number of panicles of red rice. Three hundred panicles/$m^2$ of the red rice were necessary to reduce rice grain yield by 50% of the check plot.

  • PDF

Determining Canopy Growth Conditions of Paddy Rice via Ground-based Remote Sensing

  • Jo, Seunghyun;Yeom, Jongmin;Ko, Jonghan
    • Korean Journal of Remote Sensing
    • /
    • v.31 no.1
    • /
    • pp.11-20
    • /
    • 2015

  • This study aimed to investigate the canopy growth conditions and the accuracy of phenological stages of paddy rice using ground-based remote sensing data. Plant growth variables including Leaf Area Index (LAI) and canopy reflectance of paddy rice were measured at the experimental fields of Chonnam National University, Gwangju, Republic of Korea during the crop seasons of 2011, 2012, and 2013. LAI values were also determined based on correlations with Vegetation Indices (VIs) obtained from the canopy reflectance. Three phenological stages (tillering, booting, and grain filling) of paddy rice could be identified using VIs and a spatial index (NIR versus red). We found that exponential relationships could be applied between LAI and the VIs of interest. This information, as well as the relationships between LAI and VIs obtained in the present study, could be used to estimate and monitor the relative growth and development of rice canopies during the growing season.

  • https://doi.org/10.7780/kjrs.2015.31.1.2 인용 PDF KSCI

Physiobiochemical Characteristics of Hybrid Rice (1대 잡종벼의 생리생화학적 특성)

  • Tae, Hyun-Sook;Kim, Kil-Ung;Shin, Dong-Hyun;Wenxiong Lin;Moon, Huhn-Pal
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.40 no.5
    • /
    • pp.608-618
    • /
    • 1995

  • This study was conducted to determine physiobiochemical basis of heterosis using rice hybrids such as Shanyou 63 (Zhenshan 97As Minhui 63) and Teyou 63 (Longtepu A Minhui 63) as compared with inbred rice like Milyang 23. Seed protein patterns of rice hybrid showed complementary genetic characteristics inherited from their parents. Hybrid rice had larger embryo and higher $\alpha$-amylase activity than those of inbred rice. The larger embryo of hybrid was significantly correlated with tillering ability and high number of low node tillers jplant increased by 60~70% in Shanyou 63, leading to higher productive tillers/plant which directly influenced on grain yield of hybrid rice. These characters were further supported by high chlorophyll content in hybrids. Exogenous application of GA$_3$ (0.02 ppm) on inbred rice like Milyang 23, increased significantly $\alpha$-amylase activity, but no effect of GA$_3$ on hybrid rice was observed, indicating that sufficient amount of GA$_3$ is endogenously present in hybrid rice, showing 1 to 3.5 fold higher activity of $\alpha$-amylase in hybrid rice, which trigger heterosis from the germinating stage. Further, activity of cytochrome c oxidase was 2.66 to 5.52 fold higher in hybrid rice than that of inbred rice, indicating that rice hybrids have very active metabolism reflecting vigorous growth starting from the germinating stage, in turn leading to higher tillering ability.

  • PDF

Growth and Yield of Rice as Affected by Saline Water Treatment at Different Growth Stages (벼 생육시기별 염수처리 농도와 기간에 따른 생육 및 수량)

  • 이충근;윤영환;신진철;이변우;김정곤
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.47 no.6
    • /
    • pp.402-408
    • /
    • 2002

  • Rice cultivar 'Janganbyeo' was cultivated by irrigating the saline waters of high salinity (3.0%) and medium saliniy (1.5%) for 4 days, and low salinity (0.5%) for 30 days at tillering, early meiosis and heading stage. Leaf injury due to salinity was most severe at tillering stage in 1999, but at heading stage in 2000. Heading date was delayed by 1 to 5 days by treatment of saline waters only at tillering stage. Culm length and panicle length were most severely shortened by treatment at early meiosis stage. Yield and yield components except for panicle number were decreased most by high salinity treatment regardless of growth stages. In particular, ripening ratio and grain weight among the yield components were decreased most conspicuously by the saline water treatment regardless of salinity and growth stage. Regarding grain weight grain-filling rate and duration, there is no remarked difference among the concentrations and treatment durations of saline water at tillering stage. However, their reductions were very different among the concentrations and treatment durations of saline water at early meiosis stage, being greatest when treated with high salinity for 4 days and followed by low salinity for 30 days. Also their reductions were very severe only when treated with high salinity for 4 days at heading stage.

  • PDF KSCI

Studies on the Differences of the Rice Tillering System and Yield Characteristics under the Different Cultivation Methods in Southern region of Korea I. Seedling Characteristics and Growth under the Different Nursing Methods and Time (남부지방에서 벼 재배형태별 분얼체계 및 수량구성형질의 차이에 관한 연구 I. 묘종류와 육묘시기에 따른 묘소질 및 본답 생육의 변화)

  • Kim, Yong-Jae;Shin-Hae-Ryong;Chang, Gang-Yeon
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.37 no.3
    • /
    • pp.230-236
    • /
    • 1992

  • To study the effects of different nursing methods and transplanting on the growth of the rice plant(Oriza sativa L.hn southern region of Korea, Kumo-byeo, Palgong-byeo and Dong-jinbyeo were transplanted from April 20 to July 20 with 15 days intervals as 8 days seedling (infant rice), 25 days box seedling for machine transplanting and 45 days conventional seedling, respectively. No. of leaves at transplanting were in order of 45 days seedling>25 days seedling>8 days seedling. In 25 days seedling, they were increased as transplanting dates were later from April 20 to June 5, and in 45 days seedling, it showed same tendency until June 5 with Dongjinbyeo, June 20 with Palgong-byeo and Kumo-byeo. Root activity according to the $\alpha$-naphthylamine oxidation activity and rooting activity were higher in order of 8 days seedling>25 days seedling>45days seedling. Panicle formation initiated after maximum tillering stage as transplanting at April 20 with 8 days seedling and 25 days seedling, but it intiated before maximum tillering stage as transplanting at July 20 in Kumo-byeo. and in Palgong-byeo intiations of panicle formation were shown after maximum tillering stage as transplanting until May 20, but June 5 in Dongjin-byeo. However, there was no significant tendency with 45 days seedling. Missing hill ratio were less than 5% as transplanting with 8 days seedling and 25 days seedlingregardless of transplanting periods or varieties.

  • PDF