WEED MANAGEMENT IN WET DIRECT SEEDED RICE
| dc.contributor.advisor | Sheela Barla | |
| dc.contributor.author | PRINCE KUMAR GUPTA | |
| dc.date.accessioned | 2024-05-31T10:49:27Z | |
| dc.date.available | 2024-05-31T10:49:27Z | |
| dc.date.issued | 2018 | |
| dc.description.abstract | Direct seeded rice coupled with early maturing variety has received much attention because of its low-input demand, encouraged many farmers in India to switch from transplanted rice to direct seeded rice culture. Weeds are considered to be limiting factor in harnessing full yield potentiality of rice. Hence present investigation was undertaken during kharif season of 2017 to evaluate the competing ability of different high yielding rice cultivar and methods of weed control to increase rice production. The present experiment was conducted in the Agronomical Research Farm of Birsa Agricultural University, Ranchi, Jharkhand during kharif season of 2017.The experimental soil was clay loam in texture with low organic carbon (3.6 g/kg), moderately acidic (pH 5.7), having low available nitrogen (190.76 kg/ha), high phosphorus (31.33 kg/ha) and medium potassium (182.27 kg/ha). The experiment was laid out in a split plot design with 4 weed management viz, weed free up to 15 days, weed free up to 30 days, weed free up to 45 days and weedy check. and 5 rice cultivar in sub plot i.e. DRR Dhan 44, DRR Dhan 45, DRR Dhan 46, RP Bio 226 and Swarna Shreya, altogether comprising 20 treatment combinations replicated three times. The crop was sown on 17 July 2017 with RDF 80:40:20 kg N:P2O5:K2O/ha and seed rate `60kg/ha. Weed free up to 45 days was found most effective in reducing weed density and weed dry weight, as it recorded 86.44% and 80.58 % lower than weedy check (210.44) resulting maximum weed control efficiency i.e. 80.53 per cent at maturity. Weed free up to 45 days recorded higher crop dry weight, grains/panicle, grain yield and harvest index to the tune of 58.32, 35.89, 60.70 and 8.65 percent higher as compared to their respective values under weedy check. Consequently recorded maximum net return (`61746/ha) and B: C ratio(1.63) and was 73.07% and 73.00% higher as compare to values under weedy check and also 15.64% and 15.33% higher as compared weed free upto 30 days. Rice cultivar DRR Dhan 46 recorded 38.28 and 20.40% reduced weed density and weed dry weight compared to cultivar Swarna Shreya resulting in maximum weed control efficiency i.e. 53.04 per cent at maturity. DRR Dhan 46 recorded higher crop dry weight ,grains/panicle, grain yield and harvest index to the extent of 29.84%, 16.37% , 30.26% and 3.25% as compare to Swarna Shreya i.e. 874.49 g/m2, 93.23, 3.41 t/ha, and 36.56% respectively consequently recorded higher net return (`59332 /ha) and B:C ratio(1.57). The combination of DRR Dhan 46 with weed free up 45 days recorded reduced weed dry weight to the extent of 88.96% as compared to lowest recorded with Swarna Shreya under weedy check, consequently maximum grains/panicle (138.17), 1000 grain weight (28.83g), yield (6.30t/ha), net return (`78082/ha) as well as B:C ratio (2.06). From the above findings it may be concluded that keeping Weed free up to 45 days in rice cultivar DRR Dhan 46 was found most suitable for obtaining maximum yield as well as profit in DSR method of cultivation. | |
| dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810209511 | |
| dc.language.iso | English | |
| dc.pages | 94 | |
| dc.publisher | Birsa Agricultural University, Ranchi | |
| dc.sub | Agronomy | |
| dc.theme | WEED MANAGEMENT IN WET DIRECT SEEDED RICE | |
| dc.these.type | M.Sc | |
| dc.title | WEED MANAGEMENT IN WET DIRECT SEEDED RICE | |
| dc.type | Thesis |