Plan herbicide measures in maize in good time

Maize Maize reacts particularly sensitively to problematic weeds, especially in its early growth phase to the six-leaf stage. Grasses and weeds compete with it for light, water and nutrients. If this competition can be stopped early and compatibly with the cultivation, the requirements for a well developed and high-yield maize stock are optimal. Successful weed fighting therefore has to be adjusted to the location and cultivation method.

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The latest trends in tillage are becoming increasingly popular in maize cultivation. Thus, the plough line is being replaced with reduced tillage and combined with catch crop cultivation catch crop cultivation in the autumn. This is followed either by the mulch drilling method or "Strip-Till", in which the crumb is only processed and drilled in strips. Even converting the operating premiums with the demand that five percent of arable land be used as ecological conversation areas, will contribute to increasing the value of the catch crop before maize.

Trend towards earlier sowing

But it is not only cultivation methods that are developing. New maize species are more robust and therefore have good and quick development when young. This is why the trend towards earlier sowing is continuing. Dry, good weather periods with rapidly rising soil temperature can easily be used to sow maize, depending on local circumstances, ten to 14 days earlier than usual in previous years. On one hand this results in natural yield certainty, and on the other hand the time window for complering row of maize is increased further.

From this time, the maize shades the soil sufficiently and prevents other waves of weeds. Until, the perfect herbicide strategy must ensure that the maize remains weed-free. This means a sense of proportion when selecting the means and the time. The use of herbicides predominantly takes place after the emergence of the maize. Early use of herbicides is typically more compatible for the maize, but also conceal the risk that not all grasses, millets and weeds are overcome. With late herbicide measures, the probability of more waves of millet and waves is high. However, it is more difficult to deal with all damaging plants and all weed stages and to dampen them properly.

Single-use application of the maize herbicide as compromise

As the larger maize plant needs and has to reduce more active ingredients, the potential for damage for the cultivated plant is significantly higher than when applying in good time. While the quantities of herbicides can be reduced somewhat when the conditions for use are early and good, this is no longer possible with the later treatment and advanced stage of development of the damaging plants.

In summary, it is clear that the popular one-off use of maize herbicides is frequently a compromise. Mostly this is a mixture of effectiveness and compatibility that is not always a success. For example, in dry years in particular there were frequently problems with poor levels of effectiveness of the soil herbicides and then late weed infestation in the maize stocks.

Tips on distributing herbicide measures

The solution is a well-planned distribution of herbicide measures, namely in spraying with two passages. The best treatment date is delayed by roughly one week into the early post-emergence, then the re-spraying is around 10 to 14 days after the first measure. The herbicide is divided into a model with 60 percent of the recommended volume, followed by a second spraying. This does not increase the herbicide volume per hectare.

Only the second passage makes the process of follow-up spraying more expensive. The advantages, on the other hand, are found in the effectiveness and compatibility of the measure. As a result of the second, late spraying, the effectiveness of the soild herbicides is used better, so that late weed infestations are rarer. The compatible herbicide use in maize pays off in the end with higher yields. This was proven in perennial AGRAVIS tests in St. Mauritz near Münster and in Holzbalge near Nienburg.

Which maize herbicide?

The weather and the expected weed infestion of the location, in particular the occurrene of millets, in principle determine the selection of the maize herbicide. The product combination "Clio Success" achieves the highest levels of effectiveness against all millet species, both in single use and as a series of sprays. If only the relatively easily fightable barnyard millet occurs in the maize fields, the very compatible combination of Calaris and Dual Gold is recommended, which is marketed by AGRAVIS Raiffeisen AG as "ACDC". As with Clio Success, the effectiveness against weeds such as saltbush and goosefoot can gbebe enhanced by adding products containing romoxynil, adjusted to the growing shift of the maize and the size of the weeds.

More maize in the crop rotation and simultaneously a lower intensity in soil preparation impact on the weed infestation of the locations. Permanent or rhizome-forming root weeds can be prevented or suppressed through intensive or inverting tillage. By contrast, they have good opportunities in the mulch drilling to spread from the edge of the field into the field itself. In maize cultivation these are, above all, the perennial species of wild morning glory or hedge bindweed. The bindweed species climb up the maize plants and if occurring in large numbers lead to storage and yield losses and, in particular, to harvesting problems.

Effective combination

More tillage depth and intensity between the main crops can considerable suppress the bindweeds. If bindweed has to be fought in the maize, any product with Dicamba as effective ingredient is suitable. This treatment is performed in addition to the normal weed control and is a separate application, for example in the eight-leaf maize stage. For in order to fight successfully, it is important that the bindweed has formed sufficient leaf cover to be able to absorb as much of the active ingredient as possible. AGRAVIS Raiffeisen AG provides the product Casper Plus for this. The combination of the two active ingredients in the individual products Mais Banvel and Peak support each other in the fight against wild morning glory or hedge bindweed, camomile and knotweeds species are also covered by this additional treatment.

More information is available from AGRAVIS crop farming adivce AGRAVIS crop farming adivce : Reinhold Wintergalen, Tel. 0173 . 7203065, reinhold.wintergalen@agravis.de.

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