Weeds in soybeans are a challenge during the harvest

Due to the drought during the winter period, there was less weed presence before soybean planting, which created a false impression of ease of control. Many producers opted for a single application of herbicides instead of desiccation in two phases, the so-called sequential desiccation. This decision produced variable results, with some cases of limited effectiveness. The information is from researcher Fernando Adegas, from Embrapa Soja.

In the early stages of the harvest, there were reports of phytotoxicity in soybean crops caused by the use of pre-emergent and post-emergent herbicides. Adegas explains that symptoms such as yellowing and reduced growth are common, especially in adverse conditions, such as poorly applied applications or heavy rains. He emphasizes the importance of farmers monitoring these symptoms and seeking technical guidance before taking any action.

In turn, controlling herbicide-resistant plants is one of the main challenges in weed management today. Adegas highlights that the excessive use of glyphosate has led to increased resistance in some species, such as sourgrass and horseweed.

To deal with this problem, he recommends integrated management that includes, in addition to herbicides, the use of cover crops and straw, contributing to the sustainability of production.

Adegas concluded by emphasizing the importance of constant monitoring. According to him, weeds are a growing problem that can compromise the profitability of both the current harvest and subsequent crops. He recommends that farmers continually assess their crops, especially with irregular rainfall, to ensure effective control and avoid greater problems in the future.

More information about weeds can be obtained by clicking on:

• Weeds that require attention in management

• Eudicotyledonous weeds require attention in management