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Performance of early and long-duration rice (Oryza sativa) varieties in pure and mixed cropping systems under intermediate lowland condition

Indian Agricultural Research Journals

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Title Performance of early and long-duration rice (Oryza sativa) varieties in pure and mixed cropping systems under intermediate lowland condition
 
Creator SHARMA, A R
GHOSH, A
 
Subject competition, flooding, grain yield, growth duration, land equivalent ratio, mixed cropping, rice varieties
 
Description A field experiment was conducted during 1994 and 1995 at Cuttack to study the yield performance of rice (Oryzasativa L.) varieties of early-duration ('Annada' - dwarf, 105 days and 'Banaprabha' - semi-tall, 95 days) and long-duration ('Gayatri' - semi-dwarf, 170 days and 'CR 260-77' - semi-tall, 170 days) in pure (sole crops) and mixed row stand (1:1 and 1:2 ratio) under intermediate lowland condition. The conventional long-duration varieties gave more than double the grain yield obtained from the early varieties in pure  stand. The tall varieties of both maturity groups('Banaprabha' and 'CR 260-77') performed better than dwarfvarieties ('Annada' and 'Gayatri') in pure as well as mixed stand. The total grain yield in mixed stand of'Banaprabha' with long-duration varieties was significantly higher (16.1-16.9%) than pure crop of late variety alone. The increase in yield in mixed stand was due to long-duration varieties which gave 82.6-85.3% of their yield in pure stand due to higher panicle weight following wider row spacing after the harvest of early varieties in September. Land-equivalent ratio in mixed cropping of 'Gayatri' or 'CR 260-77' with 'Bnnaprabha' was 1.40-1.52 but only 1.14-1.21 with' Annada'. An yield advantage of about 0.5 tonne/ha was achieved in the mixed cropping system which could be beneficial for avoiding risk ancl achieving sustainable production in the fragile lowland ecosystems.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2013-03-14
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/28246
 
Source The Indian Journal of Agricultural Sciences; Vol 70, No 5 (2000)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/28246/12838
 
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