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EFFECT OF ELEVATED CARBONDIOXIDE (eCO2) ON GROWTH, DEVELOPMENT AND YIELD OF KHARIF RICE
KrishiKosh
View Archive Info| Field | Value | |
| Title |
EFFECT OF ELEVATED CARBONDIOXIDE (eCO2) ON GROWTH, DEVELOPMENT AND YIELD OF KHARIF RICE
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| Creator |
Rosalin, B.P.
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| Contributor |
Pasupalak, S.N.
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| Subject |
ELEVATED CARBONDIOXIDE, GROWTH, DEVELOPMENT AND YIELD, KHARIF RICE
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| Description |
Rice is the most important cereal crop in India including the state of Odisha. However, recent climate change and its future projections have threatened the rice crop in the state. For long, elevated carbon dioxide (eCO2) was considered to have fertilization effect in increasing biomass and yield. However, Carbon dioxide (CO2) is also an important greenhouse gas contributing to global warming and thereby climate change. Hence, studies on effect of eCO2 on rice are important. However, such studies are quite few in India. Hence, a controlled environment pot experiment in Open Top Chamber (OTC) was conducted at Central Research Farm, OUAT, Bhubaneswar on rice, grown in kharif, 2012 to find out the effect of eCO2 (476 ppm) on growth, development and yield of seven rice cultivars of three maturity groups in comparison to ambient OTC and open field. Yield in eCO2 OTC was more than in open field by 2.08 g hill-1 (14.5%). The higher yield under eCO2 was associated with increased number of filled grains per panicle by 58.8%. Fewer panicle numbers per hill under eCO2 (6) than open field condition (10) influenced more than the higher filled grain number under eCO2 towards the grain yield. Increase in yield but almost same dry matter production contributed to higher harvest index under eCO2. Moreover, eCO2 produced less grain yield than ambient OTC by 5.76 g hill-1 due mainly to enhanced chaffy grain number (17), thereby decreasing the filled grain number (7) compared to ambient OTC. Elevated CO2 increased plant height, tiller number, leaf area and dry matter production. The favourable effect of eCO2 was found on plant height and tiller number during vegetative stage (active tillering), leaf area in reproductive stage (panicle initiation) and dry matter at maturity. The increases due to eCO2 were 14.8 cm more in plant height, 189 cm² hill-1 more leaf area, two more tillers per hill and 3.1 g hill-1 more dry matter compared to open field. In contrast, the relative growth rate, mean growth rate and net assimilation rate were higher in ambient OTC than in eCO2 OTC and open field. Net photosynthetic rate was almost the same under the three environments. In case of appearance of developmental stages, panicle initiation and flowering stages were accelerated by three days under eCO2 and ambient OTC compared with open field. But maturity stage came one day later under eCO2 than open field condition. Seven cultivars of rice differed in yield and yield components in response to three environments. Medium maturity cultivar Hiranmayee produced highest grain yield of 40.25 g hill-1 under ambient OTC. The high yields in early maturity cultivars under eCO2 were associated with higher number of total grains per panicle (average 156), higher number of filled grains per panicle (average 121) and lower number of chaffy grains per panicle (average 35). |
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| Date |
2017-01-04T11:37:06Z
2017-01-04T11:37:06Z 2013 |
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| Type |
Thesis
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| Identifier |
http://krishikosh.egranth.ac.in/handle/1/94345
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| Language |
en
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| Relation |
Th;4030
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| Format |
application/pdf
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