Expert advice

Controlling weed in a stubble field

This year's summer is nothing particularly pleasing for farmers, and the conditions for the harvest of cereals and winter rape are very disadvantageous. In many regions of the country, over the course of just a few days, over 100 mm per sq m of land fell. Intense rainfall prevents entry to fields over the next few days.

High availability of water in the soil together with rising temperatures – according to forecasts – will cause massive germination of wee seeds, the source of which may be secondary weed infestations or a soil seed bank. A further threat comes from perennial weeds (e. g. the common couch, the creeping thistle), which under favourable conditions intensely grow and develop.

The weed control strategies for stubble fields left over after the crop harvest should be adapted to their species. As long as self-seeding cereals or rape may be destroyed both chemically as well as by plantings after the harvest, vegetatively reproducing plants should be controlled absolutely using chemical solutions – with Agrosar 360 SL for instance being recommended. Among such burdensome weed types one should definitely include the common couch and the creeping thistle. Treatments ahead of farming in a stubble field, such as using a disc harrow, facilitates the spread of the common couch about the field. The harrow cuts the stolons and spreads it across the field – with each piece forming the beginning of a further plant.

In order to control the couch and other types of weed growing following the crop harvest, and before the start of the post-harvest crop, we recommend treatment using the non-selective herbicide Agrosar 360 SL at 4.0 l/ha. For many types of crops, effective control of the couch is possible only before sowing, and control during growth frequently prevents the achievement of satisfactory results – with the couch continuing to grow.

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