Performance of Improved Rice Varieties in the Tropics with Special Reference to Tillering Capacity

Yoshida, Shigemitsu; Parao, F. T.

doi:10.1017/s0014479700005263

Cited by 28 publications

(19 citation statements)

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“…Jacobson (1916) reported that increased tillering was accompanied by decreasing numbers of grains per panicle. Fifty-six years later, Yoshida and Parao (1972) observed the same inverse relationship for modern cultivars. Tillers arise from buds that develop in the axils of leaves (Robson et al 1988).…”

Section: Plasticity: Properties Of Individuals and Community Membersmentioning

confidence: 57%

How the rice crop works and why it needs a new engine

Sheehy¹,

Elmido-Mabilangan²,

Pablico³

2008

Charting New Pathways to C₄ Rice

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Rice is the most important crop in the world for human food. Over the past 40 years, its production has kept pace with the increase in population. However, it is clear that the gains of the first Green Revolution are largely exhausted. Rice with C 4 photosynthesis could make a major contribution to a second Green Revolution. To assess how that change could affect rice, it is necessary to understand how the rice crop works.In this paper, we examine the properties of individual rice plants both as single individuals and as members of dense crop communities. To estimate the potential of C 4 rice, we compare the yields and radiation-use efficiencies of maize, rice, and a C 4 weed. In that context, the properties of rice canopies with respect to the interception of solar radiation and its effect on leaf temperature are examined. The influence of sink size with respect to source strength is also discussed. It is possible that wild rice types have some of the anatomical features peculiar to C 4 plants and that the wild types may contain C 3 -C 4 intermediates. Consequently, we report results obtained from an examination of C 4 characteristics in the 22 species of wild rice.Of the three major cereals that feed most of the world's population, rice is arguably the most important. Almost all of the 600 million tons produced each year are consumed directly by humans, unlike wheat and maize, of which much is used for animal feed or for industry. About half the world's population has rice as the staple cereal. For humans, rice production is about providing food in a manner that is sustainable economically, socially, and environmentally. For scientists, rice production should be about converting the maximum fraction of solar energy into the maximum amount of chemical energy in grain in the shortest possible time; that conversion should be achieved using the smallest amount of land, water, and fertilizer.Charting New Pathways to C4 Rice Downloaded from www.worldscientific.com by UNIVERSITY OF BIRMINGHAM on 08/24/15. For personal use only.

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Section: Plasticity: Properties Of Individuals and Community Membersmentioning

confidence: 57%

How the rice crop works and why it needs a new engine

Sheehy¹,

Elmido-Mabilangan²,

Pablico³

2008

Charting New Pathways to C₄ Rice

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“…Furthermore, Superica-1 yielded significantly higher grain yield/0.5m 2 than X-jigna. Varietal differences in grain yield were also reported by [Yoshida and Parao, 1972] and they indicated that a variety of different tillering capacity and of improved type, yielded better than of low tillering one. Furthermore, it was also supported by [Fukai, 2000]; [Balock et al, 2002]; ; [Reddy et al, 2004].…”

Section: Grain Yield Per 05 Mmentioning

confidence: 61%

Effect of Sowing Method and Seeding Rate on Yield and Yield Components of Rainfed Rice (<i>Oryza sativa</i> L.) Varieties in Woliso, South-West Shoa Zone, Ethiopia

Angassa¹

2017

IJAAS

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Abstract:A field experiment was conducted on a farmer's field in Woliso District of Oromia Region to determine the effect of sowing method and seeding rate on growth, yield components and yield of rice varieties under rainfed conditions. Factorial combinations of three varieties (X-jigna, Gumera and Superica-1), two sowing methods (broadcast and row planting) and three seeding rates (75, 100 and 125 kg/ha) were laid out in Randomized Complete Block Design with three replications. Analysis of variance showed significantly higher difference among varieties for productive tillers, higher grain yield and total biomass. Significantly higher number of tillers at maturity and productive tillers/0.5m 2 as well as higher grain yield and total biomass/0.5m 2 were produced by Gumera. On the other hand, significantly greater grain yield/ha was produced by Gumera than that of Superica-1 and X-jigna. The effect of sowing method was non-significant on the growth parameters, yield and yield components of rice plants. Significantly greater grain yield/ha was obtained at seeding rate of 100kg/ha than 75 and 125 kg/ha. Hence, based on this experimentation, Gumera at seeding rate of 100kg/ha with broadcasting or row planting method recommended for Woliso areas.

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“…The optimum plant density in upland rice production and crop management is an example of such challenges. In monsoon Asia, the effects of plant density in lowland rice cultivation have been relatively well studied (Kondo, 1944;Yamada et al, 1960;Yoshida and Parao, 1972;Akita, 1982a, b;Patel, 1999;Hossain et al, 2003;Hayashi et al, 2006;Gendua et al, 2009;Roshan et al, 2011;Huang et al, 2013), but less effort has been devoted to optimal plant population for upland rice production (Kawatei et al, 1966;Lampayan et al, 2010;Chauhan and Johnson, 2011;Clerget et al, 2016). In SSA, Oyedokun (1977), Oyedokun and Sobulo (1977), Yamaguchi (1982), Akobundu and Ahissou (1985), Oikeh et al (2009), andOghalo (2011) studied the effects of plant density in upland rice cultivation in West Africa, but no substantial efforts have been made to study on the effects of plant density and/or plant population in East Africa, except for NaCRRI (2010) that gives recommendations for upland rice plant spacing without published data.…”

Section: Introductionmentioning

confidence: 99%

Effects of plant density on the performance of selected African upland rice varieties

Matsumoto¹,

Tsuboi²,

Asea³

et al. 2017

Afr. J. Agric. Res.

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The effects of plant density on yield and yield components in upland rice cultivation were examined by conducting a series of field experiments in Central Uganda, using three African and one Japanese improved upland rice varieties. The estimation of plant-density response functions with respect to yield components and yield revealed that an increase in plant density significantly decreased the number of panicles per hill, number of spikelets per panicle, and 1000-grain weight, and significantly increased the number of panicles per square meter. The percentage of filled grain was not affected by plant density. Compared to the Japanese variety, the three African varieties were characterized by more numbers of panicles/hill, less numbers of spikelets/panicle, higher grain-filling ratio and lighter 1000-grain weight, but differences in the degrees of response to plant density were less distinct between them. Rice yield increased in the range of plant density tested, though the marginal increase in yield due to an increase in plant density by 1 hill/m 2 diminished from 100 kg/ha at the plant density of 11 hills/m 2 to 30 kg/ha at 33 hills/m 2 . No significant differences were found among the four varieties for the level of yield as well as for its degree of positive response to plant density. The yield components that determined the increase in yield were the number of panicles per square meter and the number of spikelets per panicle, or combined together, the number of spikelets per square meter, which was estimated to reach the maximum at the plant density of 35 hills/m 2 . When the differences among the treatments in the costs of seeds and weed-control were considered, the optimum plant density was found to be 22 hills/m 2 (plantspacing of 30 cm × 15 cm), lower than the plant density that gives the maximum yield.

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Performance of Improved Rice Varieties in the Tropics with Special Reference to Tillering Capacity

Cited by 28 publications

References 5 publications

How the rice crop works and why it needs a new engine

How the rice crop works and why it needs a new engine

Effect of Sowing Method and Seeding Rate on Yield and Yield Components of Rainfed Rice (<i>Oryza sativa</i> L.) Varieties in Woliso, South-West Shoa Zone, Ethiopia

Effects of plant density on the performance of selected African upland rice varieties

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Performance of Improved Rice Varieties in the Tropics with Special Reference to Tillering Capacity

Cited by 28 publications

References 5 publications

How the rice crop works and why it needs a new engine

How the rice crop works and why it needs a new engine

Effect of Sowing Method and Seeding Rate on Yield and Yield Components of Rainfed Rice (&lt;i&gt;Oryza sativa&lt;/i&gt; L.) Varieties in Woliso, South-West Shoa Zone, Ethiopia

Effects of plant density on the performance of selected African upland rice varieties

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Effect of Sowing Method and Seeding Rate on Yield and Yield Components of Rainfed Rice (<i>Oryza sativa</i> L.) Varieties in Woliso, South-West Shoa Zone, Ethiopia