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Indian Journal of Agronomy
Year : 2018, Volume : 63, Issue : 3
First page : ( 307) Last page : ( 311)
Print ISSN : 0537-197X. Online ISSN : 0974-4460.

Research Paper Productivity and profitability of rice (Oryza sativa) varieties as influenced by age of seedlings in north-eastern Himalayan region

Singh Teekam1,*, Satapathy B.S.2, Lal B.3, Pun K.B.4

Regional Rainfed Lowland Rice Research Station, ICAR-National Rice Research Institute, Gerua, Kamrup, Assam, 781 102

1Senior Scientist (Agronomy), Division of Agronomy, ICAR-Indian Agricultural Research Institute, New Delhi, 110 012

2Scientist Agronomy, ICAR-National Rice Research Institute, Cuttack, Odisha, 753 006

3Scientist (Agronomy), ICAR-Central Sheep and Wool Research Institute, Avikanagar, Rajasthan, 304 501

4Principal Scientist (Plant Pathology), Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, New Delhi, 110 012

*Corresponding author's Email: tiku_agron@yahoo.co.in

Online published on 22 February, 2019.

Abstract

An experiment was conducted during boro (rabi) season of 2012–13 and 2013–14, at Gerua, Kamrup, Asom, India, to study the effect of different age of seedlings on growth and yield of rice (Oryza sativa L.) varieties. Ten treatment combinations of 2 different duration rice varieties, i.e. ‘Chandrama’ (175 days) and ‘Naveen’ (155 days), and 5 ages of seedlings (40, 50, 60, 70 and 80 days) were tested. ‘Chandrama’ rice recorded significantly higher grains/panicle and 1, 000-seed weight as well as grain yield (5.93 and 6.50 t/ha) over ‘Naveen’ rice. Days to 50% flowering decreased with the increment in age of seedling by 2–10 days, whereas total maturity duration increased by 6–28 days. In case of age of seedlings, 40 and 50 days old seedlings showed higher values of growth and yield attributes that reflected in grain yield. There was gradual yield decrease with increment in the age of seedling due to reduced values of tillers/m2, filled grains/panicle. The yield penalty was non-significant in case of long-duration rice variety ‘Chandrama’, while in case of ‘Naveen’, there was significant reduction in grain yield when seedling age exceeded beyond 60 days. ‘Naveen’ rice with 40 and 50 days old seedlings recorded significantly higher grain yield over 70 and 80 days seedlings respectively. Earlier farmers using their own local rice landraces which were long duration and less affected by age of seedling but with development of new semi-dwarf, medium-duration rice varieties need to be transplanted at optimum age of seedling. Thus, the age of seedling can be extended up to 60 days for those rice varieties having long duration (>175 days) while for short duration (<155 days), it should not be extended beyond 50 days.

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Keywords

North-eastern Himalayan region, Production efficiency, Productivity, Profitability, Rice, Seedling age.

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