Vol. 10 No. 2
Weed control methods in direct seeded rice under medium land condition
Author(s): R. R. Upasani and S. Barla
Abstract: A field experiment was conducted at Agronomical Research Farm of Birsa Agricultural University, Ranchi with objective to find out the efficacy of herbicides for controlling weeds in direct seeded rice under medium land situation laid out in a randomized block design with three replications. The experimental plot was dominated among narrow weeds comprising Digitaria sanguinalis, Echinocloa colona, Echinocloa crusgali, Paspalam indicum and Panicum crusgali, among broad leaved Ludvigia parviflora,Sphellanthus acmella, Commelina benghalensis, Eclipta alba and Marsillia quadrifolia, among sedges- Cyperus iria, Fimbristlis milliaceae, Kyllinga sp. and Cyperus difformis. Pooled yield attributes and yield data of two years revealed that application of Pyrazosulfuron 25 g ha-1 3-7 DAS being at par with pretilachlor – S 50% 750 g ha-1 0-5 DAS cyhalofopbutyl 10% 90 g ha-1 25-30 DAS, fenoxaprop 9.3% 30 DAS 60 g ha-1, azimsulfuron 50 DF 35 g ha-1 35 DAS, fenoxaprop 60 g + ethoxysulfuron 15 g ha-1 25 – 30 DAS, oxysulfuron 23.5 EC 300 g + 2,4-D 80% 500 g ha-1 and two hand weeding at 20 and 40 days after sowing recorded 7.6, 15.7. 19.02 and 93.17% significantly higher grain yield and 11.43, 29.76, 38.48 and 90.00 % higher straw yield as compared to cyahalofopbutyl 10 % 90 g ha-1 25-30 DAS + Almix 25-30 DAS 20 g ha-1, fenoxaprop 9.3 % 60 g ha-1 + Almix 20g g ha-1 25-30 DAS, bisparibac sodium 10% 25 g ha-1 25 DAS and weedy check respectively. Application of pyrazosulfuron 25 g ha-1 3-7 DAS and pretilachlor – S 50% 750 g ha-1 0-5 DAS recorded maximum net return (Rs. 3216 g ha-1) and B:C ratio (3.7) compared to rest of the treatments...
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