Author/Authors :
Aminpanah, Hashem Department of Agronomy and Plant Breeding - Rasht Branch , Islamic Azad University , Firouzi, Saeed Department of Agronomy and Plant Breeding - Rasht Branch , Islamic Azad University
Abstract :
Afield experiment was conducted at Rice Research
Station of Tonekabon, Iran, to determine the effect of
seed inoculation with plant growth-promoting rhizobacteria
on rice grain yield and yield components under different
nitrogen (N) rates. The experimental design was a Randomized
Complete Block with factorial arrangement and
three replicates. Factors included seed inoculation with
plant growth-promoting rhizobacteria [control (un-inoculated),
seed inoculation with Azospirillum lipoferum,
seed inoculation with Azotobacter chroococcum, and seed
inoculation with a combination of A. lipoferum and A.
chroococcum] and N rates (100%, 75%, and 50% of recommended
nitrogen rates, i.e. 100, 75 and 50 kg N ha-1,
respectively). Results showed that the highest grain yield
(7875 kg ha-1) was recorded for plants inoculated with a
combination of A. lipoferum and A. chroococcum, while
the lowest one was recorded for un-inoculated control
plants. Moreover, rice grain yield, panicle number per m2,
grain number per panicle, and 1000-grain weight increased
by 9%, 9%, 18%, and 6%, respectively, as N fertilizer rate
increased from 50 to 100 kg ha-1. The highest grain yield
(7875 kg ha-1) was obtained when N was applied at the
rate of 75 kg ha-1 to seeds inoculated with a combination
of A. lipoferum and A. chroococcum
Keywords :
Azotobacter chroococcum , Azospirillum lipoferum , nitrogen , rice
