Agronomic performance of wheat under post-emergence herbicide application

Abstract

In addition to the herbicides already registered for the wheat crop, others may be selective, such as saflufenacil, atrazine, mesotrione and triclopyr. This study aimed to assess the selectivity of herbicides via crop yield analysis, alone and in mixtures, applied to wheat in post-emergence, at the end of tillering. Two experiments were conducted using a randomized blocks design. The first experiment (E1) involved 13 and the second one (E2) 7 treatments, consisting of the application of 2,4-D, diclofop, iodosulfuron, clodinafop, saflufenacil, pyroxsulam, atrazine, mesotrione and triclopyr, alone or in mixtures. Wheat injury symptoms, plant height, number of spikelets per plant, number of grains per spikelet, 1,000-grain weight and yield were assessed. The application of diclofop and iodosulfuron was selective to the wheat, maintaining yield even under the water stress conditions observed in E1. Under the same conditions, applying 2,4-D, clodinafop, saflufenacil, pyroxsulam, atrazine/mesotrione, triclopyr or saflufenacil + atrazine/mesotrione reduced the wheat yield, with different injury levels. Under greater water availability (E2), 2,4-D, clodinafop, saflufenacil, pyroxsulam and triclopyr were selective to the wheat, with no negative effect on yield. The application of atrazine/mesotrione showed a high injury potential for the crop and reduced the wheat yield.

Effect of Tank Mix Post-emergence Herbicides on Soil Dehydrogenase Activity and Its Phytotoxicity on Wheat

“…Moreover, crop injury escalated with higher doses of 2,4-D amine or Dichlorprop plus 2,4-D ester [17]. By the 28th day after herbicide application (DHA), wheat plants treated with 2,4-D, diclofop, iodosulfuron, clodinafop and pyroxsulam displayed no symptoms [18]. Additionally, the post-emergence herbicide combination of mesosulfuron-methyl + iodosulfuron-methyl exhibited minor phytotoxic effects (score 2) on wheat crops, characterized by temporary stunting and leaf discoloration observed in the initial days, followed by full recovery thereafter, with no impact on the final wheat yield [19].…”

Optimal Design and Discrete Element Method Model Development of the Acute Angle Hoe Opener for No-Till System

“…Without effective weed control measures, no-till systems could lead to reduced crop yields [12]. The application of herbicides post-emergence is a widely adopted method for effectively managing weed populations in wheat fields [13]. The incorporation of machine learning and artificial intelligence into precision agriculture enables customized weed management, which has the potential to decrease or eliminate the need for pesticides [14][15][16][17][18][19].…”

Manejo químico de plantas daninhas infestantes da cultura do trigo

“…Sendo esse seletivo para a cultura não ocasionou redução na produtividade, bem como no PMG. Resultado semelhante foi descrito porColombo et at., (2022) onde em condições adequadas de aplicação do pyroxsulam na cultura do trigo resultou em maiores produtividades. O PMG é de grande relevância para expressar a qualidade dos grãos da cultura e desse modo os tratamentos que demonstraram maiores valores dessa variável irão consequentemente apresentarem um trigo de melhor qualidade.…”