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
Remy ROUANET
Helianthus annuus L. · Sunflower
Remy ROUANET
Helianthus annuus L. · Sunflower
Pablo Hernandez Fernandez
Helianthus annuus L. · Sunflower
Roberto Reid V'iacheslav Baranenko
Helianthus annuus L. · Sunflower
Advanta Seeds International
Helianthus annuus L. · Sunflower
TRIUMPH SEED CO.
Helianthus annuus L. · Sunflower
MAS SEEDS
Helianthus annuus L. · Sunflower
ROTARU VITALIJ FEDOROVICh / ROTARU IGOR' FEDOROVICh / ROTARU TUDOR GRIGOR'EVICh
Helianthus annuus L. · Sunflower
SYNGENTA SEEDS AG, CH
Helianthus annuus L. · Sunflower
Euralis Semences, Mondonville FR
Helianthus annuus L. · Sunflower
Syngenta Participations,CH
Helianthus annuus L. · Sunflower
Syngenta Seeds LTD (UK)
Helianthus annuus L. · Sunflower
NOVARTIS SEEDS
Helianthus annuus L. · Sunflower
PIONEER OVERSEAS CORPORATION
Helianthus annuus L. · Sunflower
Euralis Semences
Helianthus annuus L. · Sunflower
Syngenta Participations,CH
Helianthus annuus L. · Sunflower
SYNGENTA SEEDS AG, CH
Helianthus annuus L. · Sunflower
SYNGENTA SEEDS AG, CH
Helianthus annuus L. · Sunflower
Syngenta Crop Protection AG Seeds Divison
Helianthus annuus L. · Sunflower
Syngenta Participations AG| CH
Helianthus annuus L. · Sunflower
Syngenta Crop Protection,CH
Helianthus annuus L. · Sunflower
LIDEA FRANCE SAS
Helianthus annuus L. · Sunflower
LIDEA FRANCE SAS
Helianthus annuus L. · Sunflower
Syngenta Participations,CH