(Unit/t of production)
(Unit/t of production)
N
45
24
Very Sensitive
P2O5
16
12
Sensitive
K2O
16
10.5
Very Sensitive
TE
Boron: Soil fertilization 1.2kg/ha boron: Foliar fertilization 300-500g/ha
Sunflowers need to concentrate nutrients until bud formation. Afterwards, most of the nutrients are translocated within the plant or used for water absorption (potassium). All of the required nitrogen is usually applied before cultivation. The large need for nutrients is in the first phase of growth. Therefore, splitting doses is not needed. Sulphur-containing NPK fertilizers provide the required phosphorus potassium and sulphur directly at cultivation or in autumn or early spring. Liming as soil preparation should also be done in autumn or early spring. A maximum of 1.500kg CaO/ha - best as carbonate of lime, should be used to avoid boron fixation,
The yield parameters of sunflower:
Growing six to seven plants per m² and a strong and healthy stalk and leaf mass makes for ideal conditions and a high yield. For this, a nitrogen supply of 50-65kg N/ha is usually sufficient, also for stock storage and to prevent susceptibility to fungal diseases. The lush root system can have extreme nutrient uptake, especially in humus rich soils.
One application in spring
Single dose of total nutrient requirements:
Sunflowers need the nutrients concentrated at the beginning of growth. Therefore, fertilization before sowing is ideal. All required nutrients can be given in one dose. Nitrogen is fertilized modestly in comparison to the extraction rate, to avoid the effects described above. Nitrogen fertilizers with sulphur, nitrogen phosphorus or NPK fertilizers or low-chloride potash fertilizers are particularly suitable. Since this is an oil plant, particular attention must be given to the supply of boron.
Use NutriGuide to find the best product for your conditions.
LAT Nitrogen Austria GmbH
St.-Peter-Strasse 25
4021 Linz, Austria