Thursday, 25 June 2015

ROLES OF OXIDISED AND REDUCED NITROGEN AEROSOLS ON PRODUCTIVITY OF WINTER RICE (Oryza sativa L.) CROP



ROLES OF OXIDISED AND REDUCED NITROGEN AEROSOLS ON PRODUCTIVITY OF WINTER RICE (Oryza sativa L.) CROP
Bhagawan Bharali1, Bhupendra Haloi2, Pradip Chandra Dey3, Jayashree Chutia4, Sonbeer Chack5  and Koilash Hazarika6
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, Jorhat

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.

  
Complete Paper Click Below

http://ijoear.com/Paper-may-2015/IJOEAR-MAY-2015-4.pdf

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