Effect of Seed Rates and Weed Management Practices on Energetics and Economics of Broadcast Direct Seeded Rice

摘要

An field experiment conducted on the optimization of seed rate in broadcast direct seeded rice in relation to weed management practices during kharif season of 2011, indicated that significantly higher cost of cultivation was recorded in broadcast seeding followed by biasi operation for weed control and regarding seed rate it was highest in 120 kg/ha seed rate. The maximum gross and net return as well as benefit: cost ratio was obtained in herbicide treated plot. Significantly higher seed yield was recorded with 80 kg seed ha~' and weed control by using post emergence herbicide (fenoxaprop-p-ethyl 60 g a.i.ha~' + ethoxysulfuron 15 g a.i.ha~(-1)) which was statistically similar to 60 kg seed ha~(-1) and weed control by using the post emergence herbicide. Looking to the importance of seed this investigation supports use of 60 kghaseed rate with herbicide that has no remarkable reduction in yield and net return over 80 kg ha-1 seed rate.