Indian Society of Genetics & Plant Breeding

Breeding for high yielding rice (Oryza sativa L.l varieties hybrids adapted to aerobic (non-flooded, II. Evaluation of released varieties

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During wet season 2003, two hundred rice (Oryza sativa
L.) varieties released for cultivation under various ecologies
were screened in a puddled field (clay soil) under
non-flooded, irrigated (aerobic) conditions, with Rasi and
Vandana as check varieties. The checks known for their
adaptation to water stress were planted at regular intervals
(after every ten entries) to serve as controls. Twenty
seven varieties showed yield advantage over the check
Rasi. The popular varieties grown under irrigated
conditions such as Jaya, IR 8, IR 64 etc. were found
unsuitable. Most of the varieties with high yield potential
and adaptation to aerobic conditions were found among
rainfed shallow lowland and hill rice upland varieties,
while the frequency of such varieties was very low among
rainfed upland group varieties. Most of the selected
irrigated varieties showed better performance under
favourable moisture conditions with a few exceptions like
Vikas which combined high yield and adaptation to aerobic
environments. However, the semi deep water and deep
water varieties were found unsuitable under aerobic
conditions. Planting of checks at regular intervals as grids
was very useful not only in -detecting varying levels of
stress across length and breadth of the field, but also
in identifying suitable cultures for varying levels of stress.  

Keywords: Released varieties, non-flooded irrigated, aerobic condition, days to heading, grain yield

Info

Year: 2006
Volume: 66
Issue: 3
 Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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