Vol. 16 No. 1
Yield and economics of aerobic direct seeded upland rice (Oryza sativa L.) as affected by different weed control measures under rice-wheat (Triticum aestivum L.) system
Abstract: Field trial/ on farm trials (OFT) was carried out on farmer’s field at Atnauwan, Hasanchak and Agwanpur associated with the Krishi Vigyan Kendra, Barh, Patna, Bihar in the two consecutive year 2014-15 and 2015-16 during the kharif season. The trial was conducted in randomized complete block design replicated 04 times (Four no of farmers)with 07 treatments. The treatments were composed of application of 2,4-D @ 1.0 kg a. i. ha-1at 25 days after sowing, Pendimethalin1.00 kg a.i. ha-1 at 1-3 days after sowing, Pyrazosulfuron@ 200 g ha-1at 20-25 days after sowing, Bispyribac Sodium @ 200 g ha-1at 20-25 days after aftersowing,combined applicationofPyrazosulfuron@ 200 g ha-1 + Bispyribac Sodium @ 200 g at 20-25 days after sowing, weed free (Farmer practices) and weedy check. During the trial period various growth and yield attributes were recorded. Grassy weeds, broad leaf weeds and sedges were observed during the crop growth period. Combined application of Pyrazosulfuron @ 200 g ha-1+ Bispyribac Sodium @ 200 g at 20-25 days after sowing proved most efficient in controlling weeds with 95.9 % weed control efficiency (WCE). Maximum plant height (cm), more number of effective tillers/m2,higher panicle length (cm), less weed dry weight both grassy and broad leaf weight (g), highest grain (65.0 q ha-1) and straw(110.0 q ha-1)yield were recorded under weed free plot (Farmer practices). Among the herbicides treatments, combined application of Pyrazosulfuron @ 200g ha- 1+ Bispyribac Sodium @ 200 g ha-1at 25 days after sowingfound highest grain yield (62.2 q ha-1), net return (Rs. 65,862.0 ha-1) and B:C ratio (2.8) as compared to other herbicides treatments. The significantly lowest growth parameters, yield attributes, yield economics were recorded under weedy check.
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