Cultivation
Lactuca sativa L. var. capitata L.
Growing head lettuce in the open field requires strict control over temperature and light regimes to prevent premature bolting. The most important factors for success are the selection of varieties based on day length and adherence to the optimal plant spacing.
In the reference 22 varieties crop Head lettuce, where this is mentioned in the description.
Head formation in this crop is a specific reaction to the slowing of the apical bud growth. Under unfavorable conditions, such as high temperatures or long day length, plants are prone to an early transition to the flowering phase. Head-forming varieties are more demanding of light intensity than leaf varieties; therefore, even minor shading prevents the leaves from closing tightly into a head.
Agrotechnology in the open field excludes dense planting: the placement density ranges from 9 to 16 plants per square meter depending on variety characteristics. When using the seedling method, it is critical to avoid deep burial of the root collar in the soil, which delays development. Variety selection must strictly correspond to the growing season due to differences in the hybrids' response to the photoperiod.
General information about the subject — on the page Open field.
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.
Lactuca sativa L. var. capitata L. · Head lettuce
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Lactuca sativa L. var. capitata L. · Head lettuce
TORSEED - Przedsiebiorstwo Nasiennictwa Ogrodniczego i Szkolkarstwa S.A.
Lactuca sativa L. var. capitata L. · Head lettuce
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Lactuca sativa L. var. capitata L. · Head lettuce
TORSEED - Przedsiebiorstwo Nasiennictwa Ogrodniczego i Szkolkarstwa S.A.
Lactuca sativa L. var. capitata L. · Head lettuce
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Lactuca sativa L. var. capitata L. · Head lettuce
Ger Beemsterboer
Lactuca sativa L. var. capitata L. · Head lettuce
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Lactuca sativa L. var. capitata L. · Head lettuce
Eike Kampe, Lipskyi Volodymyr Volodymyrovych,
Lactuca sativa L. var. capitata L. · Head lettuce
Austrosaat (AT)
Lactuca sativa L. var. capitata L. · Head lettuce
Khareba Volodymyr Vasylovych, Horova Tamara Korniivna, Pozniak Oleksandr Vasyl`ovych, Kryvets` Dmytrii Olehovych,
Lactuca sativa L. var. capitata L. · Head lettuce
Rijk Zwaan B.V.
Lactuca sativa L. var. capitata L. · Head lettuce
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Lactuca sativa L. var. capitata L. · Head lettuce
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Lactuca sativa L. var. capitata L. · Head lettuce
QUEDLING| Saatzucht Quedlinburg GmbH
Lactuca sativa L. var. capitata L. · Head lettuce
TORSEED - Przedsiebiorstwo Nasiennictwa Ogrodniczego i Szkolkarstwa S.A.
Lactuca sativa L. var. capitata L. · Head lettuce
Przedsiębiorstwo Nasiennictwa Ogrodniczego i Szkółkarstwa Spółka Akcyjna w upadłości likwidacyjnej \Instytut Ogrodnictwa - Państwowy Instytut Badawczy
Lactuca sativa L. var. capitata L. · Head lettuce
Muzhylko Dmytro Valentynovych, Dymchenko Tetiana Mykolaivna, Muzhylko Viktor Valentynovych,
Lactuca sativa L. var. capitata L. · Head lettuce
MEISSNER| Helga Meissner in Fa. Quedlinburger Saatgut GmbH
Lactuca sativa L. var. capitata L. · Head lettuce
Ger Beemsterboer
Lactuca sativa L. var. capitata L. · Head lettuce
PLANTICO HODOWLA I NASIENNICTWO OGRODNICZE ZIELONKI SP. Z O.O.
Lactuca sativa L. var. capitata L. · Head lettuce
HORTAG SEED CO.
Lactuca sativa L. var. capitata L. · Head lettuce
Nunhems B.V.
Lactuca sativa L. var. capitata L. · Head lettuce
HILD SAMEN| Hild Samen GmbH
Lactuca sativa L. var. capitata L. · Head lettuce