Each crop has its own critical period of greatest sensitivity to weeds. In crops of continuous row sowing, it is short and proceeds with less impact on the crop. In row crops, it lasts from germination to budding – the beginning of flowering. For sunflowers, this critical period lasts 40 to 45 days. During this period, the crop must be free of weeds in order to realize its genetic potential.
Agro Expert Group has a wide range of herbicides for any sunflower protection technology.
Classic technology.
This technology involves the cultivation of classic hybrids and varieties of sunflower with the use of soil herbicides. AEG’s portfolio includes Sarmat herbicides (prometrin, 500 g/l) and a new herbicide Irwin (C-metolachlor + terbutylazine, 312.5 +187.5 g/l).
Irvine is a basic soil herbicide for the control of annual grasses and dicotyledonous weeds in sunflower crops.
Advantages:
- Wide range of activity – dicotyledonous and cereal weeds
- High efficiency in germination of sensitive weeds
- Long-lasting protective effect – up to 10 weeks
- Does not require incorporation into the soil
- Gentle effect on culture
- No restrictions in crop rotation
C – metolachlor is responsible for the control of cereal weeds, and terbutylazine – for dicotyledonous weeds. This combination of active ingredients strengthens weed control and provides long-term protection.
Sarmat is a herbicide that has become a classic of pre-emergence protection of sunflower. It has excellent soil activity and controls a wide range of annual weeds.
Soil herbicides place high demands on the field and agricultural machinery:
- Soil herbicides do not control perennial and large-seeded weeds (Theophrastus weed, cocklebur), so they need to be controlled in previous crop rotation fields.
- Good soil preparation. There should be no clods of earth larger than 2 cm in diameter on the field. Otherwise, the herbicide will remain on the clumps and its effect will be reduced.
- Dependence of herbicide dosage on soil type. On light soils, the minimum consumption rate can be used, on heavy soils – the maximum.
- It is necessary to remove plant residues from the field, as they will interfere with the herbicide’s binding to the soil. This will reduce the effectiveness of the soil herbicide at times.
- Preservation of the soil “screen”. Do not carry out inter-row cultivation within 3 weeks after the application of the herbicide.
- Analyze weather conditions. Before applying the herbicide, the soil should be at the level of the maximum field moisture capacity. If it is too dry, then there should be a high probability of precipitation in the coming days or mandatory incorporation of the herbicide by 2-3 cm with light harrows.
It is necessary to ensure optimal application of the herbicide. The sprayer should be calibrated, the rate of consumption of the working solution should be at least 250 l/ha, the sprayers should be selected for the application of soil herbicides.
Particular attention should be paid to. Classic sunflower should be cultivated in fields that are free of. Sarmat and Irvine do not control, and hybrids or varieties do not have sufficient tolerance to aggressive races.
Must Read: Agro Expert Group’s herbicide selection strategy for the protection of cereal crops.
SU – Technology
This is a technology for the cultivation of sunflower resistant to tribenuron-methyl. Tribun herbicide, STS (tribenuron-methyl, 750 g/kg) is a post-emergence herbicide for the control of annual and some perennial weeds in sunflower crops.
Advantages:
- Excellent control of dicotyledonous weeds
- High efficacy against honeycomb, thistle, ragweed and cocklebur
- Wide “window” of application – from 2 to 8 true sunflower leaves
- Gentle effect on culture
- No restrictions in crop rotation
For SU technology, the following field parameters are required:
- fallow or semi-fallow fields after cereals
- Fields with no – till and mini – till
- The main weeds are annual dicotyledonous weeds
- Low infestation of thistles and thistles
- Moderate spread of
The tribune does not control the. Therefore, hybrids for SU technology in the presence of in the field should be selected of the highest possible race (G – H) and with resistance to the main diseases. This measure will protect your crops as much as possible in the event of the appearance of aggressive races in the field and in the event of an outbreak of diseases.
IMI – Technology
Technology for cultivation of sunflower resistant to imidazolinones.
Tapir Hybrid, MK (imazetapir + imazapyr, 50 + 20 g/l) is a post-emergence herbicide for the control of a wide range of dicotyledonous and cereal weeds, including all races.
Advantages:
- Excellent control of dicotyledonous and cereal weeds
- Complete annihilation of all races
- Convenient application time
- 1 treatment per season without the need for cultivation
- Effective in no- and low-tillage systems
- Control of the second “wave” of weeds
Tapir Hybrid is perfect for the following fields:
- with a high degree of infestation by dicotyledonous and cereal weeds
- with the presence of overgrown weeds
- with a strong spread of
- with NO-till and mini-till tillage
Tapir Hybrid effectively controls all weeds in sunflower crops. If the problem of is acute, then the Tapir Hybrid should be used in conjunction with hybrids with high resistance to races (G – H). This will make it possible to control as efficiently as possible and reduce its number chemically and genetically at the same time.
Cereal weeds in classic and SU technologies
A separate place in the herbicide protection of sunflower is occupied by the control of cereals. Cereal weeds sprout in “waves”, so their control is much more difficult.
Products containing imidazolinones control dicotyledonous and cereal weeds. But what about classic and SU technology?
There is a way out – the use of a highly effective graminicide Ligat, EC (cletodym + quizalofop-P-ethyl, 150 + 65 g/l). The ligate has a systemic effect and quickly penetrates into plants through leaves and stems, accumulating at the growth points of shoots and rhizomes. Both active ingredients in the composition of the drug bind to the enzyme acetyl-CoA-carboxylase, blocking the synthesis of lipids, which leads to the arrest of growth and death of weeds.
The combination of two active ingredients in the composition of Ligat allows you to control all cereal weeds, including creeping wheatgrass, pork palmate and humai.
All cultivation technologies can be used in one farm. But it should be remembered that each of the described technologies solves its own problems with weeds and is suitable only for hybrids and varieties with resistance to a particular herbicide. Sometimes it is worth revising the cultivation technology. Change IMI to SU technology, or classic to SU or IMI in case of problems. But it is worth remembering the main thing – sunflower should not compete with weeds for 40-45 days.
Author: Victor Peresypka
, Industrial Crops
Manager, Agro Expert Group LLC
The correct selection of the herbicide is a complex task that must be solved, taking into account all the above factors. Agro Expert Group offers a set of drugs that will meet the prevailing field conditions as accurately as possible, and our specialists are ready to provide consulting services in their use.
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