Research Papers - School of Natural Sciences

Permanent URI for this collectionhttps://rda.sliit.lk/handle/123456789/1352

Browse

Filters

1997 - 19993

Advanced Search

Filter by

Settings

Author: search.filters.author.Weerakkody, W. A. PEnd date: 1999

Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    PublicationOpen Access
    Plant growth flowering and fruit formation of tomato grown under protected culture
    (Postgraduate Institute of Agriculture, University of Peradeniya: Peradeniya, 1998) Weerakkody, W. A. P; Peiris, C. N
    Protected culture is a remedy for environmental problems of crop cultivation. However, seasonal weather changes adversely affect indoor grown plants. Therefore, this study was conducted to examine the affect of protected (indoor) culture and other improved technologies, often used in protected culture, on tomato (Lvcopersicon esculentum L.) grown with irrigation during the Maha season. Two indoor cultures together with improved technology and two outdoor (open-field) cultures with and without improved technology were used as treatments. Vegetative and reproductive growth of tomato were evaluated during the respective growth stages. Except at early vegetative growth, dry weather prevailed during the cropping season. Most of the vegetative growth parameters were not significantly different between the indoor and outdoor treatments. However, indoor culture showed significantly higher flowering and fruit formation. The shed house recorded the highest number of fruits per plant. Significantly higher vegetative growth was observed with the use of improved technologies, irrespective of the experimental conditions. Moreover, the improved technologies contributedfor greater number offlowers per plant but not for number of fruits. Indoor culture in combination with the improved technology assured greater vegetative growth, flowering and fruit formation of tomato when compared to outdoor culture under low rainy conditions that prevail during the Maha season. Except for fruitformation, comparative advantages of different indoor structures were not evident.
  • Thumbnail Image
    PublicationOpen Access
    Fruit formation, marketable yield and fruit quality of tomato varieties grown under protected culture in two agro ecological zones during the rainy season
    (National Science Foundation: Colombo, 1999) Weerakkody, W. A. P; Peiris, C. N; Karunananda, P. H
    Environmental limitations in agriculture can be successhlly overcome wit11 the use of protected (indoor) culture. Howevel; the powtll and developme~t of indoor grown crops with pa~tial environmental control vary with season, location and crop genetic dif~"erences. This rescarcll was conducted to study the influence of agro-ecological conditions and varietal differences on fiuit development, yield and fiuit quality of' protected c~~lture grown tomato during the rainy season. The location, Rallangala (upcountry intermediate zone) enhanced the yield components, hit size and damage-free fruits under rainy weatller. Fruits at Peradeniya (midcountry wet zone) had higllcl. tolal soluhlc solids (TSS), fruit acidity and locular material contents compared to Rahangala. Protected culture gave greater iiuit formation, yield (fruit weight and numbcr of'marketahle fruits), f'luit size and damage-free fruits than the open field culture. As a result ofthe interaction between culture and locati.on, the hjghest yield and fruit size were reported at Rallangala while the highest TSS w'as reported at Peradeniya in protected culture. More marketable fiuits of cultivar T-245, Iligl~er f111it weight of cultivar Heat; Master and liiigher yield of cultivar Cariho were found, especially under protected culture. Caribo appeared to he suitable for both regions while Heat Master and T-245 were better adapted to Ral~angala and Pcradeniya, respectively. The polythene llouse with improved technology was more productive usder the agro-ecological conditions at Rallangala duxing MuIra season in terms of yield and external fiuit quality of tomato while it was more suitahle,for Peradeniya during XL~U, season in terms of internal fuit quality of tomato.
  • Thumbnail Image
    PublicationOpen Access
    Yield and quality of tomato as affected by rainfall during different growth stages
    (Postgraduate Institute of Agriculture, University of Peradeniya: Peradeniya, 1997) Weerakkody, W. A. P; Peiris, C. N; Jayasekara, S. J. B. A
    Cultivation of tomato (Lvcopersicon esculentum) is severely affected during the peak rainy periods in Sri Lanka, which leads to a seasonality in production andfluctuation ofprices. To study the nature of rain damage and to identify the critical growth stages prone to rain damage, staggered planting of tomato was practiced in the Mid Country Intermediate Zone during the Maha season. The rain damage was evaluated in terms of yield components, yield andfruit quality. During the vegetative growth and early flowering, rainfall was positively correlated with yield components andfruit quality. However, rainfall received during the late flowering phase reduced the weight andfinal number of fruits. During fruit growth, rainfall was positively correlated with fruit cracking andjuice pH. A negative correlation existed with other fruit defects. Hence, positive effects cf rainfall during vegetative growth and negative effects ofrainfall during reproductive growth were evident. Late flowering andfruit ripening stages were identified as critical for yield components while fruit growth andfruit ripenug stages were identified as critical for fruit quality.