<p>Background: Corn is one of the main crops in Mexico. The crop is affected by different pests such as weeds and high-cost inputs are required for its control. Objective: To determinate the efficiency of five post-emerging herbicides on the control of monocotyledonous and dicotyledonous weeds in a corn crop, as well as to identify the optimal economic herbicide. Methodology: The study was carried out in Cocula, Guerrero, Mexico under irrigation conditions. Treatments were: 1) Nicosulfurón + 2,4-D; 2) Nicosulfurón + atrazine; 3) Nicosulfurón + dicamba; 4) Rimsulfurón + 2,4-D; 5) Rimsulfurón + dicamba; 6) Rimsulfurón + atrazine and 7) Treatment without application. Sampling was performed 7, 15, 30 and 60 days after application. The variables evaluated were, weed number and control percentage. In addition, an economic analysis was carried out, depending on the grain yield obtained. Results: Application of nicosulfuron and rimsulfuron in mixture with 2,4-D, dicamba and atrazine archived control levels than or equal to 90% for 30 days on Sorghum halepense and Panicum reptans weeds. For Melampodium divaricatum and Argythamnia neomexicana nicosulfuron + dicamba and rimsulfuron + atrazina herbicides-controlled weeds for 30 days. Kallstroemia maxima weed, was controlled by 100% with the application of nicosulfuron + dicamba. As for the financial analysis, the greatest economic benefit was with the mixture of rimsulfuron with atrazine and 2,4-D. Implications: The mixture of rimsulfuron + 2,4-D is efficient on the weed control in corn crop, in addition to being the most economical. Conclusion: The application of nicosulfuron and rimsulfurn achieves the best control over monocotyledons and dicotyledons, the greater control was observed with the nicosulfuron +dicamba application, however, the rimsulfuron application with atrazine and 2,4-D generated the best profitability.</p>
El objetivo del estudio fue determinar la producción de materia seca total, rendimiento de grano, sus componentes y rentabilidad en tres genotipos de maíz en respuesta al nitrógeno y biofertilizante, en clima templado. El estudio se estableció en Montecillo, Estado de México. Los tratamientos consistieron en la siembra del maíz criollo Michoacán 21, una variedad sintética HS-2 y el híbrido Promesa, los cuales fueron inoculados con biofertilizantes, en diferentes niveles de nitrógeno 0, 80 y 160 kg ha-1. A madurez fisiologica se evaluó la materia seca total (MS), rendimiento de grano (RG) y sus componentes. Adicionalmente, se realizó un análisis económico. La aplicación de biofertilizante y nitrógeno ocasionó incrementos en la producción de MS, RG y sus componentes en función del genotipo utilizado. Michoacan-21 presento un efecto positivo con el uso de biofertilizante en la MS y RG. En general, la mayor MS se logró con la aplicación de 160 kg ha-1 de nitrógeno en el genotipo HS-2 y en el caso del RG el más alto fue con Promesa y nitrógeno a 160 kg ha-1, el cual presentó el mayor ingreso neto y total.
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