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Maha 1990/91 Research Report

1. Mango Evaluation

2. Papaya Evaluation

3. Asparagus Evaluation

4. Mango Rootstocks

5. Sweet Orange

 

1. Mango Evaluation

 

1 Name of researcher:

K.H.S. Peiris

2.Title of experiment:

Evaluation of exotic mango varieties

3.Objective(s):        

 

To identify suitable mango varieties for the region

4.Crop variety:        

Mango

5.Location:

RARC, Aralaganwila

6.Season:              

Maha 90/91

7.Treatments:

Varieties
1. Alphonso

2. Carabao

3. Carrie

4. Gouveia

5. Kent

6. Karuthakolomban

7. Okrong  

8. Otts

9. Saigon
10.Spring fells
11.Van dyke
12.Willard

8. Design:

RCBD with sub sampling

9. Number of replicates:

3

10.Plot size:          

10 m x 20 m

11.Harvested area:     

Whole plot

12.Spacing:

10 m x 10 m

13.Date of planting:   

February 21, 1991

14.Cultural practices: 

 

 

Fertilizer: 16-20-12 fertilizer mixture 500g per plant at planting

Irrigation: Plants were irrigated weekly during drought spells

15. Other information: 

 

 

This trial is a long-term trial and it will take about 4 - 5 years to examine the performance of these varieties in this region. At present experimental observations are made on growth habit, pests and diseases and flushing patterns of the plants.

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2. Papaya Evaluation

 

1 Name of researcher:

K.H.S. Peiris

2.Title of experiment:

Papaya Germplasm Evaluation

3.Objective(s):

To identify suitable papaya varieties for the region

4.Crop variety:

Papaya

5.Location:

RARC, Aralaganwila

6.Season:

Maha 1990/91

7.Treatments:    

 

 

Varieties

1. Waimanalo x 77 - Casuga
2. Tomasu Line 8
3. Solopapaya - Sun Rise
4. Waimanalo x 77
5. Solopapaya - Waimanalo Low
6. Kapoha Solo - Open pollinated
7. Local variety (check)

8. Design:

RCBD with sub sampling

9. Number of replicates:

Two (3 plants/ Replicate)

10.Plot size:

3.0 m x 7.5 m

11.Harvested area:

Whole plot

12.Spacing:            

2.5 m x 3.0 m

13.Date of planting:   

February 21, 1991

14.Cultural practices:

 

Fertilizer: 60 g Urea, 40 g CSP and 125 g MOP at planting. 

Irrigation: Weekly during dry periods

15.Other information:

The yield data and fruit quality characteristics will be available during the coming Yala season.

16.Remarks:

Pithium root rot destroyed a number of plants. Those vacancies were re-planted using seedlings treated with Captan.

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3. Asparagus Evaluation

 

1 Name of researcher:  

K.H.S. Peiris

2.Title of experiment: 

Asparagus Observation Trial

3.Objective(s):

To determine the feasibility of growing asparagus in the region.

4.Crop variety:        

UC 157

5.Location:      

RARC, Aralaganwila

6.Season:              

Maha, 1990/91

7.Treatments:          

Two spacing
1.5 m x 0.7 m
1.0 m x 0.7 m

8.Plot size:

15 m x 25 m (375 m2)

9.Spacing:

As given in item 7

10.Date of planting:   

November 5, 1990

11.Cultural practices: 

 

Fertilizer: 40 g CSP per crown at planting. Urea top dressing at 100 Kg/ha one month after planting                       

Irrigation: Weekly during dry spells


Weed control: Simazine 200g in 20 l of water applied to soil two weeks before planting crowns. Plants were mulched with Illuk lopping between rows about two months after planting.

12.Results:            

 

The crop is growing profusely. Pest or diseases were not observed during the season. Yield data may be available from 1991/92 Maha season.

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4. Mango Rootstocks

 

1 Name of researcher:  

K.H.S. Peiris

2.Title of experiment:

Rootstock Effects on Growth, Productivity and Quality of Mangoes.

3.Objective(s):        

 

To identify better rootstocks for quality mango production.

4.Crop variety:

Mango

5.Location:      

RARC, Aralaganwila

6.Season:              

Maha, 1990/91

7.Treatments:          

 

Rootstocks

Karuthakolomban
Velleikolomban
Willard
Wal-amba
Kohu-amba

Scion Cultivars
Karuthakolomban
Velleikolomban

8. Design:             

RCBD

9. Number of replicates:

4

10.Spacing:

10 m x 10 m

11.Remarks:                  

 

This trial was postponed until Maha 1991/92 due to the inability to procure seeds to raise stock plants.

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5. Sweet Orange

 

1 Name of researcher:

K.H.S. Peiris

2.Title of experiment: 

Establishment of a sweet orange observation plot

3.Objective(s):

To assess the feasibility of growing sweet orange in this region

4.Crop variety:

Sweet Orange

5.Location:

RARC, Aralaganwila

6.Remarks:

This trial was postponed until Maha 1991/92

 

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