Growth and productivity of maize (Zea mays L.) as influenced by sequential and combined application of tank mix herbicides
DOI:
https://doi.org/10.59797/ija.v69i1.416Abstract
An experiment was carried out during 2021-22 at G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand to assess the effects of sequential and tank mix application of pre- and post-emergence herbicide on weeds and maize growth. The study was comprised of nine treatments viz. Weedy (T1); Weed free (T2); Pre-emergence (PE) application of Atrazine -1 kg a.i./ha fb hand weeding (T3); PE application of Atrazine - 0.75 kg a.i./ha fb Post Emergence (Post E) application of Topramezone - 25.2 g a.i./ha (T4); PE application of Atrazine - 0.75 kg a.i./ha fb Post E application of Tembotrione - 120 g a.i./ha (T5); PE application of Atrazine - 1.0 kg a.i./ha fb Post E application of Topramezone - 25.2 g a.i./ha (T6); PE application of Atrazine - 1.0 kg a.i./ha fb Post E application of Tembotrione - 120 g a.i./ha (T7); Early Post E application of Topramezone - 25.2 g a.i./ha + Atrazine - 0.75 kg a.i./ha (T8) and Early Post E application of Tembotrione - 120 g a.i./ha + Atrazine - 0.75 kg a.i./ha (T9). The highest grain yield (7.2 t/ha) was recorded in a weed-free crop that was similar to all herbicide-treated crops and significantly higher than the weedy crop. Among herbicide treatments, sequential and tank mix applications showed similar results for grain yield. Tank mix application of atrazine - 0.75 kg a.i./ha with tembotrione 120 g a.i./ha or topramezone 25.2 g a.i./ha at 15 DAS can be suggested owing to higher grain yield and profits for farmers while lowering the dose and expenses involved in manual weeding and spraying atrazine separately.
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