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Pre-emergence herbicides are the best choice for weed control?

When you finish sowing the cereal, the next step will be to consider how to deal with the weeds that will compete with the crop during its development. Do you do pre-emergence or post-emergency herbicide treatments? We give you the keys to a 100% successful pre-emergence treatment!The most widespread way to control weeds in cereal fields is herbicide treatments, which together with cultural practices (rotations, tillage, etc ...) manage to keep the plots clean and ensure good yields.Now, when we talk about herbicide treatments, you have two options: pre-emergence or post-emergency treatments. Normally each farmer favors one form of application or another, there is also a certain tendency for zones, in some cereal areas one system is practiced more than the other.


Differences between treatment of pre-emergence and post-emergence herbicides

It is clear that pre-emergence treatments are those that are done between sowing and before the crop is born. In contrast, post-emergencies are applied when the crop is already born, usually during its early stages.Therefore, it changes the moment of application, but also the modes of action of the products, the management and the strategy to follow according to pre-emergency or post-emergency treatment.


What are the advantages of pre-emergence herbicide applications?


Pre-emergence treatments can be compromised, since they have to be done right after planting, and sometimes the time does not give for everything in this busy time for cereal workers. However, pre-emergence treatments have some advantages that you should consider:

- 1 - More efficiency: they control weeds from the first moment, ensure a weed-free birth, and if the effectiveness has been good, you can forget to treat throughout the campaign

- 2 - Residual action: Pre-emergence products often leave the field free of weeds for much of the crop cycle due to its residual action.

- 3 - Low broth dosage: to apply in pre-emergence, as you apply above the bare soil, you can treat at low pressure (1,5-2,5 bar), and use less doses of water (with 150 l / ha Is sufficient), for this reason, it is not wasted so much time filling the sprayer and can be treated more hectares.

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  • Points against pre-emergency treatments:
  • This type of practice, also has its weak points, are as follows:
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They are applied "blindly": the treatment is usually for the whole plot, since you do not know where the weeds will be born, this does not make "localized" treatments.
They are applied without having guarantees as to whether the crop will be born and will be well established, which can be an added cost if you then have to re-plant or raise the crop.If there is no rain or small irrigation after its application, which helps its incorporation into the soil, its effectiveness can be affected.

Keys to good efficacy in pre-emergency treatments:

In addition to taking into account their advantages, experts also recommend certain practices to ensure maximum effectiveness of pre-emergence herbicide treatments, here are some management tricks to ensure that your pre-emergency treatment is most effective:Favor germination of weeds before sowing: This practice is key, we must facilitate the bank of seeds of the soil that can germinate, to meet the herbicide, and thus die. Otherwise, the adventitious seed is not affected and remains on the ground waiting for the best conditions to germinate.

Prepare the ground so that weeds are born, doing a work with grower between 5 and 6 cm deep. Thus, with the rains of September and October their germination is favored.
Remove lumps, level, and settle the soil. He thinks that the treatment is intended to cover the maximum soil surface, the clods prevent the herbicide from touching the ground, and weeds can grow around it. So if there are lumps during the preparation of the seed bed, a roller pass before the pre-emergence treatment is convenient.How do agricultural waste affect the previous season?Another point to take into account with the pre-emergence treatments are the residues from the previous crop. As we want the herbicide to reach the soil, if there is too much stubble or straw on the soil, this can affect the effectiveness of the treatment. But this depends largely on the active material you apply.


For example, prosulfocarb is retained in organic matter and subsequent rains do not move it to the ground. In contrast metazachlor is less fixed to organic matter and is able to reach the soil with rains after application.Therefore, in the case of direct planting, it is important to know well the active material that you will apply in pre-emergence.

You already know a little more about the pre-emergence treatments as a strategy to combat the weeds of your fields. And you? Are you more pre-emergency or post-emergency? Leave your opinion in the comments!And remember that if you do phytosanitary treatments, note them in the Agroptima app, so in addition to contrasting if you get more account pre-emergency or post-emergency, you can take the field notebook in a click when you ask the administration . If you do not have Agroptima yet, try it free for 15 days! You'll love it!