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Thursday, 25 June 2015
ROLES OF OXIDISED AND REDUCED NITROGEN AEROSOLS ON PRODUCTIVITY OF WINTER RICE (Oryza sativa L.) CROP
OF OXIDISED AND REDUCED NITROGEN AEROSOLS ON PRODUCTIVITY OF WINTER RICE (Oryza
sativa L.) CROP
1,2,4,5 Department of Crop Physiology,
Assam Agricultural University, Jorhat-785013, Assam (India).
3Regional Agricultural Research Station,
Titabor, Assam Agricultural University, Jorhat.
6 Instruction Cum Research Farm, AAU,
Abstract—In a pot culture (2011), aerosols of oxidized nitrogen
(NaNO2) @20kgha-1yr-1 (≈200 ppm), reduced nitrogen (NH4Cl) @10kg-1hayr-1 (≈100
ppm) and distilled water (control) were sprayed (1500 cm3plant-1) weekly at
different days after sowing (DAS) to study their impacts on physiology of rice
varieties (Bishnuprasad, Kanaklata, Joymati, Jyotiprasad and Mulagavaru). In a
field trial (2012), the simulated N-aerosols @ 20 & 40 kg ha-1y-1 of each
(1000 cm3m-2) along with a control were misted to population of the rice
variety, Kanaklata at four different growth stages viz., germination and
tillering (0-30 DAS), maximum tillering, (30-60 DAS), panicle initiation (60-90
DAS) and reproductive development (90-120 DAS). In both pot and field
experiments, the N- aerosols brought about wide differences in net photosynthesis
rates, nitrate reductase activity, nitrogen use efficiency (NUE), membrane
permeability in the crop. The aerosols with lower doses at earlier growth
stages influenced NUE and economic yield of the crop varieties. Mechanisms of
altering membrane permeability either by depletion of Ca2+, or acceleration of
peroxidase activity of cell in presence of the aerosols have been elucidated.