Cultivation
Helianthus annuus L.
A critical factor in sunflower yield that determines plant access to moisture and nutrients. Optimal seeding density depends on hybrid characteristics, moisture levels, and planned agronomic practices.
In the reference 247 varieties crop Sunflower, where this is mentioned in the description.
Excessive sunflower plant density leads to a decrease in 1000-seed weight, as well as a reduction in head diameter and oil content. Overly high plant density results in plant deformation, "stretching," uneven ripening, an increased risk of disease development, and damage to the crop during harvesting.
The seeding rate varies depending on regional moisture levels: from 35–45 thousand plants per hectare in arid zones to 50–60 thousand plants per hectare in conditions with sufficient moisture or on irrigated plots. When calculating the field rate, an adjustment for field emergence is taken into account, which is usually 10–25% lower than laboratory germination, as well as an 8–10% adjustment needed when planning mechanical harrowing after emergence.
General information about the subject — on the page Planting density.
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.
Helianthus annuus L. · Sunflower
PIONEER OVERSEAS CORPORATION
Helianthus annuus L. · Sunflower
Pioneer Overseas Corporation, USA
Helianthus annuus L. · Sunflower
NUSEED EUROPE
Helianthus annuus L. · Sunflower
PIONEER OVERSEAS CORPORATION
Helianthus annuus L. · Sunflower
PIONEER OVERSEAS CORPORATION
Helianthus annuus L. · Sunflower
Olivier Soulie
Helianthus annuus L. · Sunflower
PIONEER OVERSEAS CORPORATION
Helianthus annuus L. · Sunflower
PIONEER OVERSEAS CORPORATION
Helianthus annuus L. · Sunflower
Euralis Semences
Helianthus annuus L. · Sunflower
RAGT 2N S.A.S
Helianthus annuus L. · Sunflower
Soper, John
Helianthus annuus L. · Sunflower
SYNGENTA FRANCE S.A.S.
Helianthus annuus L. · Sunflower
Pioneer Hi-Bred Int., INC. (USA)
Helianthus annuus L. · Sunflower
Rustica Prograin Genetique
Helianthus annuus L. · Sunflower
PIONEER OVERSEAS CORPORATION US
Helianthus annuus L. · Sunflower
NUSEED EUROPE
Helianthus annuus L. · Sunflower
Lidea France SAS, FR
Helianthus annuus L. · Sunflower
SYNGENTA FRANCE S.A.S.
Helianthus annuus L. · Sunflower
SYNGENTA FRANCE S.A.S.
Helianthus annuus L. · Sunflower
Amelia Bertero
Helianthus annuus L. · Sunflower
PIONEER OVERSEAS CORPORATION
Helianthus annuus L. · Sunflower
PIONEER OVERSEAS CORPORATION
Helianthus annuus L. · Sunflower
Pioneer Overseas Cor, USA
Helianthus annuus L. · Sunflower
PETIARD Benoit