Sangita Karki^1,, Nabin Sharma Poudel², Gopal Bhusal³, Suresh Simkhada², Bhishma Raj Regmi², Bhuwan Adhikari³, Sanjok Poudel¹

The study was carried out in agronomy farm of Paklihawa Campus, IAAS, Rupandehi, Nepal. The objective of the study was to determine the response of rice as influenced by different combination of organic and inorganic nitrogen sources. The study consists of three nitrogen sources i.e. urea, farmyard manure and blue green algae at various levels comprising seven treatments in randomized complete block design with three replications. Rice seedling were raised in wet nursery bed and transplanted in experimental plots. Growth parameters, yield attributing traits and grain yield of rice were recorded. Result indicates that treatment combination of 75% of recommended dose of nitrogen (90 kg ha^-1), farmyard manure (5 tons ha^-1) and blue green algae (9 kg ha^-1) contributes to higher plant height (96.13 cm), effective tiller per square meter (345.6), filled grain per panicle (180.9), grain yield (4.787 tons ha^-1), and straw yield (9.07 ton ha^-1) (p < 0.05). Also, there was a positive correlation between the grain yield and effective tillers per square meter (R²=0.254), grain yield and number of filled grains per panicle (R²=0.315). Hence, 75% of recommended dose of nitrogen (90 kg ha^-1), farmyard manure (5 tons ha^-1) and blue green algae (9 kg ha^-1) were found to improve plant characteristics thus improving rice yield.

blue green algae, Farmyard manure, Urea