Author(s):

S Ramesh

Abstract: Field experiments were conducted at Annamalai University, Experimental Farm, Annamalainagar, during Navarai season 2016 (January to April) and Kuruvai season (June to September) to study grain yield, nutrient uptake and nitrogen use efficiency as influenced by different sources of vermicompost and fertilizer nitrogen application in rice cultivation. The experiment comprised of ten treatments which includes control, recommend dose of nitrogen (RDN) alone and in combination with graded dose of nitrogen along with various organic manures namely sewage sludge compost, pressmud, FYM and water hyacinth compost and different sources of vermicompost. These were laid out in randomized block design and replicated thrice. Rice cultivar ADT 43 was used as test variety. The results revealed that crop raised with 50 % N through urea + 50% N through pressmud vermicompost registered higher DMP and grain yield. The same treatment also noticed significant influence on the nutrient uptake. Plots received with 50 % N through urea + 50% N through pressmud registered higher values of Nitrogen use efficiency, Agronomic efficiency (AE), Apparent nitrogen recovery (ANR), physiological efficiency and Internal efficiency. From the above experimental results, it could be concluded that with application 50% N through urea along with 50 % N through pressmud vermicompost resulted in higher rice grain yield and also superior in respect of nutrient uptake and conserve the nitrogen under rice cultivation.

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