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Sunflowers

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Sunflowers

Sunflowers need a warm, dry climate with an average temperature of at least 15.5 degrees Celsius between May and September. 
They grow best in classic grain maize regions.
 

Herbicide measures

Sunflowers react up to the 6-leaf-stage sensitively to a competition from weeds. Therefore, an extensive weed freedom is a presupposition for high yields in this phase.

A component to reach this aim is Herbosol® - an additive for the improvement of the effects of residual herbicides. The addition of Herbosol® improves the efficiency of the herbicide treatment, because the fine drop share is reduced and thereby a better distribution of the herbicides on the target area is reached. It binds the active substance firmer to the soil particles and it prevents therefore the erosion of the active substances into deeper shifts.

For the rise of the compatibility of the foliar herbicide sprayings in the post-emergence we recommend the application of 2 – 3 ls/ha Aminosol®.

Fertilization

Sunflowers develop an extensive root system and, therefore, have a high nutrient appropriation property. To meet the needs of main nutrient supply, it is important to know the nutrient salary in the soil. On the basis of a soil analysis an aimed soil fertilization with nitrogen, phosphorus, potassium, sulphur or magnesium or lime, can be performed, in accordance with legal regulations.

With the N-fertilization there is caution because to high N-contents lead to a delayed maturity and a raised disease susceptibility. On the basis of e.g. cold and wet in spring the availability of potassium and phosphorus in the soil can be limited, so we recommend for a better start of crops the application of Lebosol®-PK-Max from 4-leaf-stage.

A sufficient magnesium  supply is required for the protection of a yield-effective formation of chlorophyll. Sunflowers possess an average sulphur need. For high, stable yields  a sufficient sulphur  supply is essential. Here Lebosol®-MagSOFT SC plays an important role in addition to the basic fertilization with magnesium and sulphur.

Trace nutrient care

With the cultivation of sunflowers the influence of trace elements on yield and particularly on the quality is rather high.

Sunflowers have a high boron need; therefore, particularly on basic light and sandy soils as well as in regions with early summer aridity, the boron supply should be respected. Boron lack becomes visible first in the leaves whose edges show honeycombed bubbles. In the stalk  it comes to obliquely running fissures and in other consequences to breakages. With a distinct lack the vegetation point still dies before the blossom. The flourish baskets themselves are deformed with deaf seeds. Ideal is an application of 2 or 3 times  with 1,5 l/ ha Lebosol®-AqueBor SC a time from 4-leaf-stage.

In regard to a sufficient copper supply sunflowers are very demanding. Sunflowers show, as a result of copper lack, a very restrained growth, withers appearances in young leaves as well as a prevented flourish formation or deformed flourishes with deaf seeds. For the formation of a high yield approx.. 100 – 150 gs of copper/ha are needed.
Manganese is involved in the control of the photosynthesis. As a result of this, the assimilation performance of the sunflower is improved and the yield is affected lastingly positively. With its adjusting effect in the fatty acid metabolism manganese secures a high oil content. The manganese need of sunflowers lies between 400 - 600 gs / ha according to yield.

VITALoSoL® GOLD SC combines the micronutrients copper, manganese as well as sulphur and covers so  the nutrient need of the sunflower with an application rate of 1.5 - 3 ls / ha very well.

With a higher concentration of 4 – 6 ls/ha of VITALoSoL® GOLD SC the oversupply with these elements strengthens the plants health and the resistance of the sunflower against diseases. Use VITALoSoL® GOLD SC in the sprayings to secure the success of the plant protection.

To plan the aimed application of the foliar fertilization, the leaf analysis has proved itself as an aid in order to recognize a latent lack. This is exceptionally important because also a not visible (latent) lack of nutrients leads to a loss of yield and quality.

Main recommendations

Aim/Problem Recommendation Time
Improvement in effectiveness and tolerability of soil-applied herbicides 0,2 - 0,6 l/ha Herbosol® (increase to 0.6 l/ha on light soils with a low humus content, reduce to 0.2 l/ha for heavy soils with a high humus content) With soil-applied herbicides
Improvement in effectiveness and tolerability of post-emergence herbicide sprays or generally to boost stress tolerance 2 - 3 l/ha Aminosol® With post-emergence herbicides, in extreme weather conditions
Resilience - manganese and copper 2 l/ha Lebosol®-Mangan GOLD SC +
0,5 l/ha Lebosol®-Kupfer 350 SCor 1,5 - 3 l/ha VITALoSol® GOLD SC
From 4-leaf stage
Yield and vitality, macronutrients 2 times 6 l/ha Lebosol®-PK-Max From 4-leaf stage
Yield and vitality, macronutrients 1 - 2 times 3 - 5 l/ha Lebosol®-MagSOFT SC From 4-leaf stage
Improvement in resistance to illness, yield, oil content 4 - 6 l/ha VITALoSol® GOLD SC From 4-leaf stage
Yield and vitality, micronutrients 2 - 3 times 1 l/ha Lebosol®-AqueBor SC From 4-leaf stage