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Brinjal

Brinjal

Brinjal (Eggplant)

Family: Solanaceae
Botanical Name: Solanum melongina L

 

 

Egg plant or brinjal (Solanum melongina) is a hardy plant compared to other vegetables grown in Sri-Lanka. Because of its hardiness, it can be successfully grown in very dry areas under rain-fed conditions or with minimum irrigation facilities. It covers second large extent after curry banana. Egg plant can be kept for more than one year in production by pruning at the end of the harvesting season. The fruit colour varies from pure white to dark purple or black in different varieties.

This crop can be grown throughout the year in all Agro-climatic regions except up country-wet zone. Grows well up to an elevation of about 1300m in low country wet zone, Intermediate, up country intermediate and dry zone. Eggplant is tolerant to drought. Well drain, light soils with a pH of 5.5-5.8 are more suitable for the cultivation of brinjal.


Nutritive Components in 100 gm of edible portion of Brinjal

Component

Composition

Moisture ( % )

92.7

Protein (g )

1.4

Fat (g)

0.3

Mineral salt (g)

0.3

Fiber (g)

1.3

Carbohydrates (g) 

4.0

Oxalic acid (mg)

18.0

Calcium (mg)

18.0

Magnesium (mg)

16.0

Phosphorous (mg)

47.0

Iron (mg)

0.9


Anjalee (F1 hybrid)

                                                                                                                        

Flowers are purple in colour
Anthocyanin deposited in ribs
Purple coloured fruits; Resistance to Bacterial Wilt
Most applicable for wet and dry zones
Fruit weight is about 80-110g and 20 cm in length
Yield 30 -40 tons/ Ha with irrigation facilities

Amanda ((F1 hybrid)

 

Flowers are purple in colour and high number of flowers can be seen
Leaf blades are purple mixed green in colour
Anthocyanin moderately deposited in ribs
Fruit weight is about 75-100g and 15 cm in length
Cylindrical shape, purplish pink colour fruits
Moderately resistant to bacterial wilt
Yield 30 -35 tons/ Ha with irrigation facilities

SM- 64

 

Anthocyanin moderately deposited in stem
Flowers are light purple in colour
Moderately resistant to bacterial wilt
Most applicable for wet and dry zones
Cylindrical shaped, light purple colour, medium sized fruits
Yield 15-18 tons/ha with the irrigation facilities

Thinnavelli Purple

 

Cylindrical shaped, dark purple fruits, susceptible to Bacterial Wilt
Anthocyanin well deposited in stem
Leaf blades are purple mixed green in colour (bright dark purple)

Padagoda (BW 11)

 

Flowers are light purple in colour
Stem and ribs are in green colour
Resistant to bacterial wilt
Cylindrical shaped; the fruit has light purple lines on a white background.
Anthocyanin moderately deposited in stem
Most applicable for wet and intermediate zones


Nursery Management
As in other solanaeceous crop direct seeding is not practiced due to the small size of the seeds.

Twenty nursery beds of 3x 1 m are required to raised seedlings for 1 ha. Soils should be worked to a fine tilth. Prepare about 20-leveled raised beds to a height of 15-20cm. Incorporate well decomposed organic matter at the rate of 3-4 kg/m2.

Sterile seedbeds by burning them using straw and paddy husk. Treat seeds with a recommended fungicide such as Captan or Thiram at the rate of 2g/100g of seed. Seed should be planted in beds 10-15 cm apart at the depth of 0.5 to 1 cm and cover with a thin layer of soil. Spread a layer of straw mulch over beds and water daily. Remove the mulch when the germination is complete. Avoid exposure of seedlings to heavy rains and to prolong sunlight. Harden seedlings by exposing them to sunlight and increasing irrigation intervals for one week before planting. Seedlings are ready to transplant after 21 days.

 

Seed Requirement: 250 g/ha (1g of seeds contain 250-300 seeds)

Time of planting
Maha- November and December
Yala- April to May
(Avoid planting during heavy rains)
Nursery should be laid one month before planting

Land preparation
Avoid field cropped with Solanaceous crops in the previous season to minimize the incidence of Bacterial wilt. Plough the field to a depth of 15-30cm and prepare Planting holes with the dimension of 30 x 30 x 30cm. Incorporate organic matter to the soil at the rate of 6-12t/ha. Level the area and establish drains across slopes to ensure good drainage.

Planting and Spacing
Optimum spacing is 90 x 60cm with one plant/hill. Healthy seedlings aged 25 to 30 days with four fully expanded leaves are suitable for transplanting. Transplant in the evening to avoid mid day wilt but ensure that soil moisture is adequate at transplanting.
Seedling must be shaded with plant material until they are established

Field Establishment
Selected field should not have a history of a cultivation of a solanaeceous crop at least 2 seasons. After primary and secondary land preparation level the land and make planting holes at a spacing of 90x60 cm. Addition of organic matter (200-300g/hill) to planting holes facilitate quick establishment of the transplant. Planting can be done in the afternoon to avoid desiccation of seedlings.

 

Fertilizer application (kg/ha)

 

UREA

TSP

MOP

Basal

75

325

85

Top Dressing-1(1MAP)

75

---

---

Top Dressing-2 (2MAP)

75

---

85

Top Dressing-3 (3MAP)

75

---

---


Major Disease and Insect Pests

Damping off, Bacterial wilt and Foot Rot are the major diseases that affect this crop.

Major pests that affect brinjal are Shoot and Fruit Borer (SFB), Mites, Thrips and Hoppers.


Damping Off
Causal Agents:
Fusarium spp
Pythium spp
Phytopthora spp
Rhizoctonia spp

Causal agent of this disease is fungus. Symptoms of this disease are rotting the base of the nursery plants and then die off.

Seed treatments will effectively control this disease.
Eg: Captan
Thiram
Chlorothalonil

Bacterial wilt

 

Common disease which affects the production of brinjal is bacterial wilt. There is no chemical control for this disease which said to be the number one diseases for all solanaeceous crops. Cultural practices such as deep drains to facilitate drainage and the use of resistant varieties can be recommended to control the incidence.


Foot rot

Causal agent of this disease is a fungus. Symptoms of this disease are similar to that of bacterial wilt. At the collar region of the affected plant lesions are visible. By improving drainage this can be prevented. Redomil as a soil application is very effective in controlling this disease.


Insect Pests

Shoot and fruit borer


Continuous cultivation of brinjal on a same field and non removal of plant parts of the previous brinjal cultivation aggravate this damage. The symptoms first appear in immature shoots i.e. wilting. Soon after observing wilted shoot remove and destroy them.

The damage after flowering and fruiting can be controlled by using recommended insecticides.

Mites and hoppers

Recently these insects seem to cause considerable damage to the crop. Sulphur can be used very effectively to control mites while hoppers can be controlled by using recommended insecticides

Harvesting

Can begin harvesting about 75 days after transplanting. Ten to twelve picks at weekly intervals are possible. After 3 months harvesting period a ratoon crop can be raised if plants are pruned.


Yield
Yield can be varied with the variety and climatic condition.
Main crop - 20-25t/ha
Ratoon crop -7-10t/ha

Harvesting & Post-harvest Technology
Peak production months

The peak cucumber production months during the Maha season are January, February and 1st and 2nd weeks of March and that during the Yala season are April, May, June, July and 1st and 2nd weeks of August (DOA Vegetable Task Force Report).).


Economics & Marketing

Extent and production

Brinjal cultivation extent and production during 1991-1999 periods.

Year

Area (ha)

Production (t)

 

Maha

Yala   

Total  

Maha

Yala

Total

1991

5491     

3870

9361

37964

27681

65582

1992

5126

3897

9023

37337

25199

62536

1993

5235

3820

9055

37892

24949

62841

1994

4994

3825

8819

36898

25735

62633

1995

5314

3875

9099

39905

25253

65158

1996

5686

3833

9518

42272

25892

68164


1997

5378

3941

9319

39407

27388

66795

1998

5381

3985

9366

40443

28410

68853

1999

5930

4118

10048

44290

29914

74204

Source: Department of Census and Statistics.

During 1991 to 1999 the total cultivation extent of brinjal increased from 9361 ha to 10048 ha. The production increased from 65582 to 74204 tons in the same period. The increased production is due to increased in extent as well as increased in productivity.


Export value

Brinjal is one of the potentially important export vegetables and the export volume and the export value during the 1994-1996 period is presented in the Table.

National Average Yield, Unite Cost of production and Net return of Brinjal during 1998-2001
(Assuming Cost of Production is Rs. 34,600 / ha and Average Producer Price of Rs. 4.00/kg)

Year

National Average
yield (t/ha)

Unit COP
(Rs/kg)

Net return (Rs/ha)

1998       

8.2

5.97               

26300

1999

8.5

5.58

29000

2000

9.0

5.27

33500

2001

9.5

5.00

38000

Source: DOA Vegetable Task Force Report

Cost of production of brinjal

Operation

Labour/ Mandays

Labour cost Rs.

Input cost Rs

Total cost Rs

Land Preparation

18

3600

3068.00

6668.00

Nursery/ Transplanting

20

4100

800.00

4900.00

Fertilizer Application

05

1000

5000.00

6000.00

Pest and disease management

30

6000

5000.00

1100.00

Harvesting/Transport

30

5000

---

5000.00

Total

103

19700

13868.00

23668.00


Price fluctuation

Overall the monthly average wholesale and retail prices of brinjal do not fluctuate very much compare to most of the vegetables grown in Sri Lanka. This is indicated in the values given in the table. This is because of steady supply to the market throughout the year. Since this crop is growing all over the island this is possible. The retail prices were roughly about 2 times the wholesale.