Author(s):

GR Mali, Verma A, Bharat D Malunjker, Manish Bera and Deekshith HN

Abstract: A field experiment was conducted on clay loam soil during kharif, 2017 at Instructional Agronomy Farm, Rajasthan College of Agriculture, Udaipur to find out the best chemical weed management practices in maize. Thirteen treatments were tested in randomized block design with three replications. The results of the experiment revealed that the lowest total weed density was observed with tank mix application of atrazine 0.5 kg ha-1 + tembotrione 0.125 kg ha-1 PoE at harvest. All the weed control treatments were also found significantly superior in reducing dry matter of monocot, dicot and total weeds compared to weedy check at harvest. The minimum total weed dry matter at this stages ( 2.91 g m-2) were observed under atrazine 0.5 kg ha-1 + tembotrione 0.125 kg ha-1 PoE at 15 DAS and it was closely followed by atrazine 0.5 kg ha-1 + topramezone 0.025 kg ha-1 PoE at 15 DAS ( 3.36 g m-2). An application of atrazine 0.5 kg ha-1 + tembotrione 0.125 kg ha-1 PoE at 15 DAS resulted in maximum weed control efficiency of 98.47 per cent, at harvest. All the weed control treatments increased the plant height, dry matter accumulation and plant population of maize over weedy check. The application of atrazine 0.5 kg ha-1 + tembotrione 0.125 kg ha-1 as PoE at 15 DAS recorded the tallest plants (188.6 cm) with greatest dry matter accumulation per plant ( 87.67 g) at harvest.The post-emergence application of atrazine 0.5 kg ha-1 + tembotrione 0.125 kg ha-1 at 15 DAS treatment resulted in maximum seed yield (5240 kg ha-1) which was statistically at par with post-emergence application of atrazine 0.5 kg ha-1 + tembotrione 0.125 kg ha-1 at 20 DAS (4963 kg ha-1).Alike seed yield, the maximum stover yield (7028 kg ha-1) and biological yield (12269 kg ha-1) were also recorded maximum under application of atrazine 0.5 kg ha-1 + tembotrione 0.125 kg ha-1 PoE at 15 DAS treatment which were superior over rest of the treatments.

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