Effect of weed management practices and seed rates on economics and energetics on direct seeded rice production system

Abstract

An experiment was conducted, for two consecutive years to evaluate the effect of weed management practices and seed rates on economics and energetics on direct seeded rice production system. Experiment was conducted during kharif 2013 and 2014 in Inceptisols. Rice variety MTU 1010 was taken as test crop. The experiment was laid out in strip plot design in vertical strip six weed management practices comprising two hand weeding, application of pre and post emergence herbicide i.e. bispyribac-Na, pretilachlor + bensulfuron, azimsulfuron and weedy check was allotted and in horizonatal strips three seed rates ranging from viz., 80, 60 and 40, kg ha-1 was arranged. The mean of grain yield over two seasons revealed that significantly higher grain yield was recorded in two hand weeding and it was at par with the chemical control method application of pre -emergence oxadiargyl 70 g ha-1 fb bispyribac Na @ 20 g ha-1 at 25 DAS and azimsulfuron 35 g ha-1fb bispyribac Na 20g ha-1at 15 and 35 DAS. Significantly superior net return and B: C was found with application of pre-emergence oxadiargyl 70 g ha-1 fb bispyribac Na @ 20 g ha-1 at 25 DAS which was at par with two hand weeding. The relation between agriculture and energy is very close, agricultural sector itself is an energy user and energy supplier in the form of bio-energy. The energy input output, energy use efficiency and energy productivity was significantly higher with application of pre -emergence oxadiargyl 70 g ha-1 fb bispyribac Na @ 20 g ha-1 at 25 DAS over other treatments.