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Organic Farming: Impact on Rice (Oryza sativa L.) Productivity and Soil Health

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Author(s): S. Krishnakumar | A. Saravanan | K. Ramesh | S.K. Natarajan | V. Veerabadran | S. Mani

Journal: Asian Journal of Plant Sciences
ISSN 1682-3974

Volume: 4;
Issue: 5;
Start page: 510;
Date: 2005;
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Keywords: Physical | biological properties | grain | straw yield

ABSTRACT
Investigations were carried out to study the effect of organic farming with various sources of organic manures and their combinations on the soil physical properties, nutrient availability and biological properties during July 2003 to October 2004. The recommended dose of NPK fertilizer was 90: 40: 40 kg ha 1 for Kharif and Rabi rice (ADT 36). The recommended dose of 90 kg N ha 1 was substituted through organics viz., FYM, Sesbania rostrata, composted coirpith alone and in combination with neem cake and Azolla. Application of FYM+NC at the rate of 90 kg N ha 1 showed significantly reduced bulk density and increased hydraulic conductivity, water holding capacity and percent pore space during Kharif’ 04 and Rabi’ 04. The biological properties like bacteria, fungi and actinomycetes also higher in the same treatment. FYM+NC (T6) gave significantly higher grain yield (5675 kg ha 1 during Kharif and in Rabi was 5175 kg ha 1. Higher straw yield (6520 kg ha 1) in Kharif and in Rabi was 6020 kg ha 1 in the same treatment.

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