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Subject: Agronomy × Author: Naresh Kumar × Start date: 2009 ×
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    ThesisItemOpen Access
    Weed management in transplanted rice
    (CCSHAU, 2009) Naresh Kumar; Nandal, D.P.
    The present investigation was carried out at the Students’ Farm of College of Agriculture, CCS Haryana Agricultural University, Kaul (Kaithal) during Kharif 2008. The main objective was to find out the best herbicide, which control the weeds significantly and help in crop growth. The experiment consisted of fifteen treatments viz., two doses of post-emergence herbicides, bispyribac sodium (25 and 30 g/ha) and azimsulfuron (30 and 40 g/ha) with two timings of their application (20 and 25 DAT) and one dose of fenoxaprop-p-ethyl 56.25 g/ha (25 DAT). Four pre-emergence herbicides pretilachlor 750 g/ha, butachlor 1500 g/ha, oxadiargyl 100 g/ha, pyrazosulfuron 20 g/ha along with weedy and weed free checks and were laid out in randomized block design with three replications. The experimental field was dominated by grassy, broad leaf weeds and sedges viz. Echinochloa colona, Echinochloa crusgalli, Ammania baccifera, Ludwigia parviflora, Lindernia spp., Marsilea quadrifolia, Cyperus iria and Cyperus difformis. The weed dry weight and density were significantly lowest in pretilachlor treatment. The growth parameter plant height, tillers/m2 and crop dry matter accumulation/m2 were statistically higher in pretilachlor treatment. Grain and straw yield was also significantly higher in pretilachlor treatment. Among the new post-emergence herbicides bispyribac sodium 25 & 30 g/ha (20 DAT) was found excellent herbicide. Bispyribac sodium 25 & 30 g/ha (20 DAT) were statistically at par to weed free treatment to control the grassy weeds and sedges. Azimsulfuron 30 & 40 g/ha (20 DAT) were statistically at par to weed free treatment in controlling broad leaf weeds. Butachlor 1500 g/ha and pyrazosulfuron 20 g/ha (3 DAT) were significantly at par to weed free treatment to control all types of weeds. Gain and straw yield of pretilachlor, butachlor, bispyribac sodium (25 and 30 g/ha applied at 20 DAT) and pyrazosulfuron were statistically at par to weed free treatment.