Agrotechnology

Effect of weed control treatments on grain yield, weed control efficiency, nutrient uptake and soil microflora in transplanted Rice

2^nd International Conference on Agricultural & Horticultural Sciences

Radisson Blu Plaza Hotel, Hyderabad, India February 03-05, 2014

M Padmanabhan, K B Manjunath, M Hanumanthappa, Shamaraj and M Murali

Posters: Agrotechnol

Abstract:

A field experiment entitled Effect of weed control treatments on grain yield, weed control efficiency, nutrient uptake and soil microflora in transplanted rice was conducted during Kharif 2011 at ZARS, Brahmavar, Udupi district (Karnataka), India. The experiment consisted of 10 treatments laid out in randomized complete block design with three replications. The treatments are four pre-emergence herbicides, three post emergence herbicides, cono weeder at 20 days after transplanting followed by hand weeding at 40 days after transplanting, hand weeding twice at 20 and 40 days after transplanting and unweeded control. The results revealed that bensulfuron methyl at 60 g a.i ha -1 + pretilachlor at 600 ga.i ha -1 and bispyribac sodium at 25 g a.i. ha -1 have achieved significantly higher grain yield (5212 and 5012 kg ha -1 , respectively), weed control efficiency (95.74 and 93.29% ) and nitrogen, phosphorous and potassium (110.83, 16.32 and 113.85 kg ha -1 , respectively) uptake by crop. Unweeded control recorded the significantly highest nitrogen, phosphorous and potassium removal by weeds (16.10, 3.18 and 20.15 kg ha -1 , respectively). Significantly least nitrogen, phosphorous and potassium removal by weeds was recorded with bensulfuron methyl at 60 g a.i. ha -1 + pretilachlor at 600 g a.i. ha -1 (2.70, 0.87 and 2.20 kg ha -1 ). Highest microbial population of bacteria, fungi, actinomycetes, PSB and Azospirillum were recorded in hand weeding twice at 20 and 40 DAT (54.30 106, 16.33 103, 8.33 104, 17.67 105 and 14.00 105 CFU g -1 soil, respectively).

Biography :

M Padmanabhan born and brought up in Mysore, Karnataka completed his school and college education in Mysore. He then completed his BSc (Agriculture) during 2011 and his M.Sc. (Agriculture) in Agronomy during 2013 from University of Agricultural Sciences, GKVK, Bengaluru. He conducted his research on Effect of different organic manures on growth and yield of transplanted rice for his Masters degree. He has published two research papers, four research abstracts and two popular articles in reputed journals and magazines. He has also participated in two national level conferences. At present, he is pursuing his Ph.D. degree in Agronomy from UAS, GKVK, Bengaluru.