LETTUCE ( Lactuca sativa).  Most important salad crop  Occupy maximum area under salad vegetables.  Temperate vegetable but also grown in tropical.

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LETTUCE ( Lactuca sativa)

 Most important salad crop  Occupy maximum area under salad vegetables.  Temperate vegetable but also grown in tropical and subtropical climates of the world  Tender leaves and heads are consumed as salad after chopping  Rich in vitamin A, Ca and Fe. Lettuce(Lactuca sativa) Family: Compositae Chromosome No.: 2n=16,18 Origin: European-Siberian

1. Head type (L. sativa var. capitata) I. Butter head type:  Produces relatively small & loose heads.  The outer leaves are green in colour  Inner leaves are creamy or yellow which are oily, crumpled & soft texture.  They do not withstand shipping and handling. II. Crisp head type:  Popular in North America & European countries  Brittle textured a tightly folded large heads (upto 1 kg).  Excellent shipping & handling abilities.  Leaves are wrinkled, non-wrapped and round.  The outer leaves are green and inner leaves are very thin, crisp & soft. Types of Lettuce

2. Leafy or bunching type (L. sativa var. crispa)  Non-heading type.  Colour of leaves varies from light green to red. 3. Cos or romain type (L. sativa var. longifolia)  Plants are straight growing and about 25 cm in height  Produces elongated leaves to form a loaf shaped head.  The outer leaves are slimy & light green coloured  Inner leaves are finer & light in colour.  Coarse leaves with good eating quality.

4. Asparagus or stem type (L. sativa var. asparaginia)  Also known as celery lettuce.  Produces thick stems which are consumed either raw or cooked as vegetable after peeling.  The leaves are also edible but inferior in quality than other types. Mixture of different types of lettuce

Varieties White Boston : Butter head type Dark green : Butter head type Green lakes :Crisp head type Great Lake, Imperial 859 : Crisp head type Slobolt, Chinese Yellow : Leafy type PH-Lettuce : Stem type For H.P. Alamo 1: Head type. Simpson Black Seeded: Leafy type. Eves Wonder: Heading type. Ruby: Leafy &purple

Climate  Cool season vegetable.  Requires a monthly average temperature of o C.  Seeds become dormant & fail to germinate when the soil temperature is above o C.  Temperature above 22 o C promotes bolting causing bitterness in leaves & accelerate the development of tip burn and rot.  Hot, rainy or humid weather is also not favourable as it causes rotting of head lettuce. Soil  Thrives best on well drained sandy loam soil rich in organic matter.  Sensitive to high acidity.  pH  About 2-3 ploughings followed by planking is essential to get the soil friable and leveled.

Seed rate g/ha Leafy type is sown directly in the field Spacing 45 x 30 cm N.I. Plains:September-October of nursery Low hills : September-November Mid hills : September-October High hills: March-July Planting time

Manures & Fertilizers Irrigation  Immediately after transplanting  Subsequently, irrigate the crop at an interval of 8-12 days. FYM (q/ha)NP2O5P2O5 K 2 O (Kg/ha) Method of application same as other leafy vegetables

Interculture & weed control ☻Shallow hoeing & weeding are essential to keep the field free from weeds & to maintain proper aeration. ☻About 3-4 hand weedings at days interval are sufficient. ☻Pre-transplant application of kg/ha effectively controls most of the weed.

Harvesting ☼ The leafy var. become ready for harvesting within days of sowing ☼ Harvest when the leaves attain full size but remain tender. ☼ Head type var. takes days to harvest. ☼ Heads are harvested when they attain a good size & become solid. Yield Head type: q/ha Seed production Isolation distance: 25 m

PHYSIOLOGICAL DISORDER Tip burn Tip burning of the lateral margins of the inner leaves of mature heads. Reasons: © High temperature, light intensity & long duration © Excess N © Ca & B deficiencies. © High Mn content. Management: © Spray the crop with CaCl 0.5% DISEASES Damping off, Root rot, Downy mildew, Bacterial rot, Lettuce mocaic, Big vein (soil borne viruses), fungus Olpidium INSECTS Aphids: Spray oxydemeton or 0.05% Big vein