FEDERATION OF CROP SCIENCE SOCIETIES OF THE PHILIPPINES
Institute of Plant Breeding, College of Agriculture and Food Science
University of the Philippines Los Baños, College, Laguna 4031
Email: [email protected]
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Discipline (give two choices, number priority)
Crop Physiology and Biochemistry
Postharvest Handling, Processing and Utilization
Technology Development and Commercialization
Technology Extension/Dissemination and Education
Plant Breeding and Genetics
Health and Nutrition
Crop Production and Management/Protection
Socioeconomics
Instructions for submission of abstracts: Limit abstracts to 300 words (excluding authors' names and addresses, and
keywords). Use 10 pt Arial font and provide at most 5-6 keywords. We prefer that abstracts be submitted in Microsoft
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EFFECT OF NITROGEN, BIO-FERTILIZER, AND SILICON APPLICATION ON YIELD AND YIELD
COMPONENTS OF RICE (Oryza sativa L.)
Abolghasem Panahi1,2, Hashem Aminpanah2*, Peyman Sharifi2
1Department
of Agronomy and Plant Breeding, Guilan Science and Research Branch, Islamic Azad
University, Rasht, Iran; 2Department of Agronomy and Plant Breeding, Rasht Branch, Islamic Azad
University, Rasht, Iran, P.O. Box: 41335-3516.
Email address: [email protected], [email protected]
A field experiment was conducted in Neka, Mazandaran, north of Iran, to determine the effect of nitrogen
(N), N2-fixing bacteria (Azospirilum + Azotobacter), and silicon (Si) on rice grain yield and yield components.
Treatments were: N rates (0, 75, 150 kg ha-1), bio-fertilizer application (inoculation with or without
Azospirillum + Azotobacter), and Si rates (0, 150, 300 kg ha-1). Rice grain yield was significantly affected by
N rate, bio-fertilizer application and Si rate. The interaction between N rate and bio-fertilizer rate was
significant for yield. With bio-fertilizer application, grain yield was significantly increased as N rate increased
from 0 to 75 kg N ha-1, but slightly reduced at 150 kg ha-1 N rate. Without bio-fertilizer application, the
highest grain yield was obtained in plots applied with 150 kg N ha-1. Regardless of N rate and bio-fertilizer
application, the highest grain yield (5287 kg ha-1) was observed in plots applied with 300 kg Si ha-1.
Nitrogen application significantly increased plant height, tiller number per m2, grain number per panicle,
1000-grain weight, biological yield, harvest index, grain N concentration, and grain N uptake across biofertilizer applications and Si rates. Across N and Si rates, plant height, tiller number per m2, grain number
per panicle, biological yield, harvest index, grain N concentration, and grain N uptake were significantly
increased with bio-fertilizer application. Moreover, Si application increased significantly plant height, tiller
number per m2, grain number per panicle, 1000-grain weight, biological yield, harvest index, grain N uptake
across biofertilizer applications and N rates. This study proved that bio-fertilizer application could reduce
chemical N application rate with increase in rice grain yield.
Keywords: nitrogen, plant growth-promoting rhizobacteria, rice, silicon (Si)