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Lettuce - Introduction

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					Production Methodology of
         Lettuce
         Prepared by


         Md J Meagy
Lettuce - Introduction

   S/N - Lectuca sativa L.
    Family - Asteraceae


  Temperate annual plant
Mostly use as leaf vegetables
    Lettuce – Health benefits

Low in Saturated Fat & Na
Very low in Cholesterol
Good source of Vit B6, Ca & Mg
Very good source of Fiber, Vit A, Vit C, Fe, K & Mn

Reduces risk of cancer, and heart disease
                Source: Nutrient data provided by USDA SR-21
        Lettuce - Cultivars

1. Butterhead- e.g. Buttercrunch

2. Loose leaf- eg. Salad Bowl

3. Cos or Romaine- eg. Red Rosie

4. Crisphead- eg. Great Lakes

5. Stem or asparagus lettuce- eg. Celtuce
        Lettuce - Production

Soil - Loamy sands/sandy loams & well drained

Temperature - In summer average 87oF, In winter
average 55oF

Fertilization - N: 60 to 100 lbs, P2O5: 80 to 120 lbs,
& K2O: 60 to 170 lbs per acre.
Generalized rate (lbs/A): 70-80-120.

Irrigation - 38 to 50 inches of water per acre
        Lettuce - Production

Temperature:
  Seed Germination – Optimum 70 to 75oF
  Growth & Development – Optimum 55 to 60oF

pH: 6.0 to 7.6

Amount of seed/acre - 16 to 20 oz.
       Lettuce - Production
Planting depth of seed - 1/4 to 3/8˝

Row width - 60˝

In-row spacing - 12˝ in double rows

Days required to grow - 40 to 60 days

Plants/acre - 20,000 to 46,000 plants
Lettuce – Insects Management
Aphids              Loopers



Armyworms           Leaf miners


Cutworm

Management - Crop rotation, destruction
 of crops residues, & IPM
 Lettuce – Diseases Management

Bottom rot            Grey mold



Mildews               Damping-off



Lettuce mosaic        Leaf drop
                 Management:
                 -Use resistant varieties
                  & well drained soil
         Lettuce - Harvest
Hand Harvest - 40 to 60 DAP

Containers - Field cartons 18 - 30 heads
 each

Grades - Graded based on defects & head
 firmness

Average yields - 22,500 lbs/A (400 to 500 24-
 head cartons)
     Lettuce - Post harvest
Packaging/Handling - 40 - 45 lb fiberboard
 boxes; immediate cooling (preferably
 vacuum type)

Storage temp & RH – 32oF & 95% (2-3 wks)

Transit temp & RH– 32oF & 98%
             Acknowledgement


                                     Usha R Palaniswamy



                Prof. Allen Barker




Md J Meagy                           Prof. Lyle Craker

				
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posted:12/18/2011
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