Abstract:
This study investigates the effects of different seeding depths
and water stress on growth and yield of direct-seeded rice. The experiment was
a 3x2x2 factorial in a randomized complete block design with four replications.
The main factors (03) were seeding depths (0, 1 and 5 cm), water level (well
watered and water stress at 30 days after seeding (DAS) and rice cultivars (Pathum
Thani 1 and Suphan Buri 1). Above-ground biomass and root length density were
significantly affected by rice cultivars, seeding depths and water stress. The
Suphan Buri 1 had a higher above ground biomass and root length density than
the Pathum Thani 1. At the first 7 days of water stress, maximum above-ground
biomass was obtained at 1 cm seeding depth. But at a later stage, the highest
above ground biomass was observed with a seeding depth of 5 cm at both 60 and
90 days after seeding. The greatest root length density was obtained at a seeding
depth of 5 cm. Grain yield was significantly affected by seeding depths and
water stress. The highest grain yield was obtained in 5 cm seeding depths compared
with other low depth under water stress at vegetative stage (30 DAS). It was
concluded that yield loss under water stress at vegetative stage may be compensated
for by increasing seeding depth above shallow depth levels.
S. Sanusan, A. Polthanee, A. Audebert, S. Seripong and J.C. Mouret, 2010. Growth and Yield of Rice (Oryza sativa L.) as affected by Cultivars, Seeding Depth and Water Deficits at Vegetative Stage. Asian Journal of Plant Sciences, 9: 36-43.
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