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Yala 1991 Research Report

 

1. Adaptability testing trial - Grape

2. Variety Evaluation of Exotic Mango

3. Rootstock Effects on Growth, Productivity and Quality of Mango

4. Germplasm Evaluation Papaya

5. Performance of Woodapple grafted Sweet Orange

6. Adaptability testing trial - Pineapple

7. Variety evaluation - Bush Beans

8. Variety evaluation - Carrot

9. Variety evaluation - Tomato

10.Asparagus Observation Trial

 

1. Grapes

 

1.Name of researcher

K.H.S. Peiris

2.Title of experiment

Adaptability testing trial - Grape

3.Objective(s)

To study the performance of selected grape varieties under the conditions of Mahawali System B and
To identify the promising varieties for the region.

4.Crop variety

Grapes

5.Location

RARC, Aralaganwila

6.Season

Yala 91

7.Treatments

Varieties

1. Cardinal 7. Italia
2. Rebier 8. Nyora
3. Thompson seedless 9. Waltham
4. Black Muscat 10. Purple-

5. Flame seedless cornichon
6. Gordo 11. Red emperor

8. Design

Observational plots

9.Spacing

2.5 m x 4 m

10.Date of planting

June 6, 1990

11.Cultural practices

Fertilizers were applied at the rate of 235 g Urea, 155 g of CSP and 510 g of MOP per plant in June, 1991. During the season plants were basin irrigated at weekly intervals. Plants were allowed to grow vegetatively during this season. Fungicides and insecticides were applied accordingly to control diseases such as Downey mildew, Rust and leaf eating caterpillars. 

12. Remarks:

Plants were not pruned to induce flowering during this season. Twenty-six plants were affected by fire on 25th of July. However, 18 of these burned plants were rehabilitated with heavy pruning. 

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2. Mango Variety Evaluation

 

1 Name of researcher

K.H.S. Peiris

2.Title of experiment

Variety Evaluation of Exotic Mango

3.Objective(s)

To identify suitable mango varieties for the region

4.Crop variety

Mango

5.Location

RARC, Aralaganwila

6.Season

Yala 91

7.Treatments

1. Alphonso 7. Okrong

2. Carabao 8. Otts

3. Carrie 9. Saigon
4. Gouveia 10.Spring fells
5. Kent 11.Van dyke
6. Karuthakolomban 12.Willard

8. Design

RCBD with sub sampling

 

9. Number of replicates

Three replicates with two plants per replicate

10.Plot size

10 m x 20 m

11.Spacing

10 m x 10 m

12.Date of planting

February 21, 1991

13.Cultural practices

Irrigation

Plants were irrigated weekly during drought periods due to low rainfall during this season as compared to previous Yala seasons.

14. 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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3. Mango Rootstocks

 

1 Name of researcher

K.H.S. Peiris

2.Title of experiment

Rootstock Effects on Growth, Productivity and Quality of Mango

3.Objective(s)

To identify better rootstocks for quality mango production

4.Crop variety

Mango

5.Location

RARC, Aralaganwila

6.Season

Yala 1991

7.Treatments

Rootstock Varieties

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

Rootstock seedlings are now being raised to produce planting materials for this trial.

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4. Papaya Germplasm Evaluation

 

1 Name of researcher

K.H.S. Peiris

2.Title of experiment

Germplasm Evaluation - Papaya

3.Objective(s)

To identify suitable papaya varieties for the region

4.Crop variety

Papaya

5.Location

RARC, Aralaganwila

6.Season

Yala 1991

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.Remarks

This trial was planted in February 1991. All the foreign varieties were highly susceptible to Pithium root rot and a large number of plants were dead about two months after plantings. Those vacancies were re-planted using seedlings treated with Captan but with little success. Therefore, this trial was abandoned.  

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5. Performance of Woodapple grafted Sweet Orange

 

1 Name of researcher

K.H.S. Peiris

2.Title of experiment

Performance of Woodapple grafted Sweet Orange

3.Objective(s)

To study the performance of wood apple grafted sweet orange under the conditions of Mahawali system B

4.Crop variety

Sweet Orange

5.Location

RARC, Aralaganwila

6.Season

Yala 91

7.Treatments

Sweet orange grafted on woodapple stock.

8. Design

Observational plot

9.Spacing

3 m x 3 m

10.Date of planting

10.01.1988

11.Cultural practices

Recommended cultural practices were followed.

12.Results :

 

Twenty trees were sampled for harvesting on September 16, 1991. Yield and some fruit quality measurements are presented in the Table 1.

Table 1. Yield and selected quality characteristics of orange fruits harvested on September 16, 1991.

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Character Mean SD Range

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Number of fruits / tree 18 15 1 - 56

Weight of fruits / tree (kg) 2.5 2.0 0.16 - 7.7

Average fruit weight (g) 150 35 77.2 - 220
Fruit diameter (mm) 69.2 4.4 60.3 -80.5
Peel thickness (mm) 7.6 1.8 5.0 - 13.3
Pulp color1 3 1 1 - 4
Skin texture2 3 1 2 - 4

 

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1. Scale 1 - 5;1-Pale white, 2-Pale yellow, 3-Yellow,
4-Dark yellow, 5- Orange.

 

2. Scale 1 - 5;1-Very smooth, 2-Smooth, 3-Rough,
4-Very rough, 5- Abnormal.

 


Fruit yield showed a great variation form plant to plant. Fruits were more or less normal in size and had a thick, rough skin with a yellow color pulp. Well mature fruits with a dark yellow pulp were very sweet. With this level of yields having 1111 plants/ha, it could be expected to get in average 2.8 T of fruits (= 20,000 fruits) per hectare in the Yala season with no irrigation.

 

It was observed that some fruits with dark yellow pulp were very sweet. This indicates that sweetness increases with further maturity. Therefore, it is very important to leave the fruits in the tree for a sufficient period of time until they are fully mature to get good quality fruits.

 

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6. Adaptability of Pineapple

 

1 Name of researcher

K.H.S. Peiris

2.Title of experiment

Adaptability testing trial - Pineapple

3.Objective(s)

To study the performance of pineapple under the prevailing climatic conditions in the region.

4.Crop variety

Pineapple

5.Location

RARC, Aralaganwila

6.Season

Yala 1991

7.Treatments

Ratoon suckers of variety Mauritius

8. Design

Observational plot

9.Spacing

80 cm x 30 cm

10.Date of planting

November 6, 1989

11.Cultural practices

Plants were sprinkler irrigated as and when necessary.

12.Remarks

Yield data and other results were reported in previous reports. During this season ratoon suckers were growing and no flowering was observed.

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7. Variety evaluation - Bush Beans

 

1. Name of Researcher

K.H.S. Peiris

2. Title of experiment

Variety evaluation - Bush Beans

3. Objectives

To study the adaptability of bush beans to the region and to identify promising heat tolerant varieties.

4. Crop

Beans (Bush Type)

5. Location

RARC, Aralaganwila.

6. Season

Yala 91

7. Treatments

B 35 - Top Crop

B 244 - Narbonne

B 245 - Florence

B 246 - Xero

8. Design

RCBD with 4 replicates

9.Plot size

2 x 4 M

10.Spacing

50 x 10 cm

12.Date of planting

June 6, 1991

13.Cultural practices

Cultural practices described in the Vegetable Variety Testing Guidelines were followed

14.Remarks

Most of the plants were destroyed after pod set due to Collar Rot disease and bean mosaic virus. Though plants in all varieties set pods, pod development did not occur normally.

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8. Variety evaluation - Carrot

 

1. Name of Researcher

K.H.S. Peiris

2. Title of experiment

Variety evaluation - Carrot

3. Objectives

To identify some promising carrot varieties for the region

4. Crop

Carrot

5. Location

RARC, Aralaganwila

6. Season

Yala 91

7. Treatments

Cape Market
CT - 225 - Kuroda
CT - 226 - No 12-ACA-03
CT - 228 - Berlioum Bercoro
CT - 229 - Flakkee

8.Design

RCBD

9.Number of replicates

4

10.Plot size

1.2 x 4 M

11.Harvested area

Whole plot

12.Spacing

30 x 05 cm

13.Date of planting

June 4, 1991

14.Cultural practices

Cultural practices described in the Vegetable Variety Testing Guidelines were followed.

 

15.Results:

Yield characteristics and disease severity of carrot varieties tested are presented in the Table 1. These data were not statistically analyzed because the yields were very low.

 

Table 1. Yield, tuber size and percent loss of carrot plants
due to soft rot at the time of harvesting.

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Variety Total Tuber Tuber Loss due

Yield Yield Size to disease

(t/ha) (t/ha) (g) (%)

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Cape Market 1.97 1.06 32 94.7

CT-225 Kuroda 1.57 0.80 35 96.3

CT-226 No12-ACA-03  1.04       0.50 60 98.4

CT-228 Berlioum 4.79 2.20 25 82.5

CT-229 Flakkee 3.62 1.89 40 93.1

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Plants were heavily infected by soft rot. By the time of harvesting less than 20 % of the original number of plants remained in the plots. In addition to the diseases, smaller tuber size also caused lower yields.

 

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9. Variety evaluation - Tomato

 

1. Name of Researcher

K.H.S. Peiris

2. Title of experiment

Variety evaluation - Tomato

3. Objectives

To identify promising heat tolerant tomato varieties for the Yala season in Mahawali System B

4. Crop

Tomato

5. Location

RARC, Aralaganwila.

6. Season

Yala 91

7. Treatments

T 62 - KWR
T 146 - T-146
T 245 - T-245
T 492 - Precious F1
T 493 - New King Kong
T 494 - Caribe
T 495 - Marmando
T 496 - Vihara I
T 508 - Caraibo
T 509 - Vihara II

8. Design

RCBD

9. Number of replicates

4

10.Plot size

3.5 x 2.4 M

11.Harvested area

Whole plot

12.Spacing

80 x 50 cm

13.Date of sowing

May 04, 1991

14.Date of planting

May 30, 1991

15.Date of harvesting

First; August 08, 1991
Last; September 13, 1991

16.Cultural practices

Cultural practices described in the Vegetable Variety Testing Guidelines were followed.

18.Results:

 

Ten tomato varieties were tested in this trial and only seven varieties had fruits set. Varieties KWR, T-245 and Caribo did not set any fruits at all. Also the yields were very low for other varieties in this trial. Therefore, the data were not statistically analyzed and are presented as average values of four replicates in the
Table 1.

 

Table 1. Number of picks, fruit weight and average yield of
tomato varieties.

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Variety Average fruit Yield
Picks weight (g) (Mt/ha)

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T-146 T-146 5.0 17.0 2.17
T-492 Precious F1 2.3 13.3 1.75
T-493 New King Kong 3.0 23.5 3.91
T-494 Caribe 2.8 17.4 0.27
T-495 Marmando 2.8 33.9 1.53
T-496 Vihara I 3.8  9.51.75
T-509 Vihara II 4.5 19.1 2.94

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Though all varieties flowered 20 - 27 days after transplanting, most flowers dropped without pollination probably because of very high temperatures prevailed during the end of June. Very low yields in the varieties which had set fruit is due to lower number of fruits set as a result of poor pollination and smaller fruit size as shown in the Table 1.

 

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10. Asparagus Observation Trial

 

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

Yala 1991

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

The crop was irrigated weekly. Weed control was done by manual cultivation and using an Illuk mulch.

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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