Jornal Global de Biologia, Agricultura e Ciências da Saúde

Abstrato

EFFECACY OF VARIOUS HERBICIDES TO CONTROL WEEDS IN DRY DIRECT SEEDED RICE (Oryza sativa L.)

K.P Bhurer, D.N Yadav, J.K Ladha, R.B Thapa2 & K.R Pandey

Despite multiple benefits of dry direct seeded rice (DDSR), weed control remains one of the major challenges for its success. A field experiment was conducted at Regional Agricultural Research Station, Parwanipur, Bara during rainy season of 2010 and 2011in randomized complete block design with four replications to evaluate effectiveness of different weed management practices; weedy, weed free and other five practices with pre and post-emergence herbicides; Pendimethalin, Pyrazosulfuron, Penoxsulam, Bispyribac, Azimsulfuran, 2,4-D, plus one to two hand weeding on the performance of DDSR. Results showed that plant growth, yield and yield attributing parameters and weed dynamics were significantly affected and the trend of higher production and lower weed dynamic in different growing stage of DDSR was obtained. Among the weed control practices, application of pendimethalin (1 kg.a.i /ha.) followed by (fb) 2,4-D 1 kg a.i./ha at 25 and hand weeding 45 days after sowing was found the best for obtaining higher yield and weed control efficiency in DDSR.