Effect of improved nutrient management on grain yield of rice (Oryza sativa) and soil health under organic management

B.L. MANJUNATH; GOPAL R. MAHAJAN; R. RAMESH; N.P. SINGH

doi:10.59797/ija.v61i1.4341

Authors

B.L. MANJUNATH
GOPAL R. MAHAJAN
R. RAMESH
N.P. SINGH

DOI:

https://doi.org/10.59797/ija.v61i1.4341

Keywords:

Grain yield, Net returns, Organic nutrient sources, Recommended fertilizers, Rice, Soil fer- tility

Abstract

A field experiment was conducted at ICAR Research Complex for Goa, Goa, for 5 years during 200913, to standardize different nutrient sources for organic production in 3 varieties of rice (Oryza sativa L.) in split-plot de- sign with 3 replications. Rice variety Karjat 3 gave significantly higher grain yield (4.09 t/ha) than either Revathy (3.49 t/ha) or Pusa Sugandh 5 (2.47 t/ha). Application of FYM resulted in at par grain yield (3.66 t/ha) with rec- ommended fertilizers (3.87 t/ha), while Gliricidia with Eupatorium sp. recorded 90% of the grain yield (3.47 t/ha) and 86% of the straw yield (6.88 t/ha) obtained with recommended fertilizers (3.87 and 7.99 t/ha, respectively). Higher increase in soil organic carbon was observed with the application of FYM over 5 years (1.24%). Levels of P and K in the soil were appreciably reduced after 5 rice crops with the application of any of the nutrient sources. Application of vermi-compost influenced higher buildup of both bacterial and actinomycetes growth in soil (24.72 105 CFU/g and 53.39 104 CFU/g, respectively). Application of Gliricidia with Eupatorium sp. recorded at par net returns ( 40,000/ha) by recording 96.5% net returns of the recommended fertilizers ( 41,460/ha).

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