Growth and productivity of lowland rice (Oryza sativa) as influenced by substitution of nitrogen fertilizer by organic sources

Abstract

Field experiment was conducted during rabi and kharif seasons of 2011 and 2012 at research farm of ICAR–RC for NEH Region, Tripura centre, to assess the competence of different organic sources for substituting the 50% N fertilizer in integrated nutrient management system of rice (Oryza sativa L.) production. Data reveals that the substitution of 50% recommended dose of N fertilizer with either FYM@11.2 tonnes/ha or Glyricidia leaves @ 11.6 tonnes/ha significantly improved the growth and yield attributes of both rabi and kharif rice as compared to 100% recommended N fertilizer dose (80 kg N/ha). The maximum values of growth attributes (plant height, tillers/hill and total dry matter accumulation/hill), yield attributes (productive tillers/hill, panicle length, filled grains/panicle and 1 000 grain weight) and grain yields of rice was obtained with 50% recommended N fertilizer dose along with either FYM@11.2 tonnes/ha or Glyricidia leaves @ 11.6 tonnes/ha during both the seasons. Therefore, study suggested that the Glyricidia leaves has the competence for substituting the 50% recommended dose of N fertilizers and a suitable option for improving the productivity of lowland rice in Tripura region of North-East India.