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M. Sc. Dissertations

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Subject: Agronomy × Author: Ajay Singh × Start date: 2010 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Studies on weed management in direct seeded rice
    (CCSHAU, 2014) Ajay Singh; Nandal, D.P.
    A field experiment was conducted during Kharif 2012 at Students’ Farm of College of Agriculture, CCS Haryana Agricultural University, Kaul (Kaithal). The treatments treatments included pre and post emergence herbicides (T1: pendimethalin 1000 g ha-1 fb bispyribac sodium 25 g ha-1, T2: pendimethalin 1000 g ha-1 fb bispyribac sodium 25 g ha-1 +ethoxysulfuron 18.75 g ha-1, T3: pendimethalin 1000 g ha-1 fb bispyribac sodium 25 g ha-1 +Almix 4 g a.i. ha-1, T4: pendimethalin 1000 g ha-1 fb fenoxaprop 67 g ha-1 , T5: pendimethalin 1000 g ha-1 fb fenoxaprop 67 g ha-1 +ethoxysulfuron 18.75 g ha-1,T6: pendimethalin 1000 g ha-1 fb fenoxaprop 67 g ha-1 + Almix 4 g a.i. ha-1,T7: oxadiargyl 100 g ha-1 fb bispyribac sodium 25 g ha-1, T8: oxadiargyl 100 g ha-1 fb bispyribac sodium 25 g ha-1 + ethoxysulfuron 18.75 g ha-1, T9: oxadiargyl 100 g ha-1 fb bispyribac sodium 25 g ha-1 + Almix 4 g a.i. ha-1 , T10: oxadiargyl 100 g ha-1 fb fenoxaprop 67 g ha-1 , T11: oxadiargyl 100 g ha-1 fb fenoxaprop 67 g ha-1 + ethoxysulfuron 18.75 g ha-1, T12: oxadiargyl 100 g ha-1 fb fenoxaprop 67 g ha-1 + Almix 4 g a.i. ha-1) which were compared with weedy check and weed free treatments in randomized block design with three replications. The major weed species infesting direct seeded rice were Cyperus difformis, Cyprus rotundus, Leptochloa chinensis, Echinochloa colona, Echinochloa glabrescens, Eclipta alba, Ammannia bacciferai, etc. Among different weed control methods, pendimethalin 1000 g ha-1 fb bispyribac sodium 25 g ha-1 +Almix 4 g a.i. ha-1 resulted in in significantly higher grain (3967 kg ha-1) and straw (5752 kg ha-1) yield along with other yield attributing characters viz. effective tillers m-2and no. of filled grains per panicle. This treatment produced comparable grain and straw yield to the plots which were kept weed free for the whole season as well as pendimethalin 1000 g ha-1 fb bispyribac sodium 25 g ha-1 +ethoxysulfuron 18.75 g ha-1, pendimethalin 1000 g ha-1 fb fenoxaprop 67 g ha-1 +ethoxysulfuron 18.75 g ha-1and pendimethalin 1000 g ha-1 fb fenoxaprop 67 g ha-1 + Almix 4 g a.i. ha-1. Lowest grain yield (1515 kg ha-1) was produced in weedy check, which was significantly lower than weed free. Economic parameters such as net return (Rs1,03,207 ha-1) and B:C(2.37) were highest in pendimethalin 1000 g ha-1 fb bispyribac sodium 25 g ha-1 +Almix 4 g a.i. ha-1which was comparable to weed free but higher than other weed control treatments.