Lettuce

Question 1

scientific name
family
genus
species
2.
global production
world largest exporter
countries producing lettuce
3.Origin

Answer 1

scientific name
family
genus
species
2.
global production
world largest exporter
countries producing lettuce
3.Origin

Question 2

1. medicinal uses of lettuce
2. general characteristics
3. sowing time

Answer 2

1. mild narcotics properties
induces sleep
rich in anti oxidants(Vitamin A and C)
small amouts of carbohydrate,protein and fats
minerals like copper,Ca,Fe
2.Daisy family 
asteraceae
composite-characteristic inflorescence
Rosette until it bolts
at bloom it branches
Annual or biennual plant 
sow time-september to november
plnat in the late summer as to prevent bolting and reach maturity when the autumn air becomes cool

Question 3

1. the optimum temperature for the lettuce is ………………………..
2. night temperature……………………and day temperature…………….
3. temperature over 30 degree celsius causes……………..during harvesting period
4. continued thermo inhibition(25 to 30 degree celsius) is known as…………………
5. what is photo dormancy?
6. the soil pH requirement for the plant is …………………..
7. name the varieties of lettuce
8. teh variety which is difficult to grow, not heat resistent, bolts as temperature rises is ……………………
9. the variety which is 30 cm tall and sweet in flavor……………
10. the variety that grows fast, long lasting,suitable for hydroponics
11. the varieties that are available in Bhutan are………………….. and ………………….

Answer 3

1. 13-23 degree celsius
2. 7 degree celsius, 23 degree celsius
3. wilting
4. Thermo dormancy
5. dormancy occuring due to low light level .it is because of sowing the seed deep into the soil where the light doesnot reach the seed for germination.
6. 5.8-6.5
7. a.Iceberg(crisp head)
   b. butterhead
   c. leafy lettuce
   d. Cos(Romaine)
8. crisp head(Iceberg)
9. Cos romaine
10. leaf lettuce
11. (Sunny) leaf lettuce and Great lake(ice berg)

Question 4

1. why do we have to incoporate the fertilizers 3-4 weeks before transplanting?
2. ……………….amount of seeds are required for a hectare of land
3. transplanting is done when the plant is one month old with leaves of …………………
4. the spacing for the plant to plant is ……….and for row to row………………..
5. post harvest temperature and humidity

Answer 4

1 to protect the plant from ammonia toxicity and prevent them from jelly butt and bottom rot
2.0.6 kg
3.3-4
4.30-45 and 45-60 cm
temeperature- 0-2 degree celsius and humidity-98-100 %