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Has files: YesSubject: search.filters.subject.Tomato

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    PublicationOpen Access
    A Study on the Eff ect of Bitt ern Treatments with Organic Ferti lizers on the Growth of Tomato
    (Faculty of Humanities and Sciences, SLIIT, 2024-12-04) De Alwis, N.S; Priyadarshani, S. V. G. N.; Gammanpila, H.W.
    Bitt ern, a byproduct of the solar salt producti on process has been studied for its potenti al to become a cost-eff ecti ve ferti lizer due to its high ion concentrati on. However, high salt toxicity and low levels of phosphorus and nitrogen have aff ected its ability to supply the plant’s nutriti onal requirements on its own fully. Here we observe its success as a ferti lizer when paired with known organic, nutriti onal sources such as Gliricidia sepium and Vermi-wash in the growth of Tomato (Solanum lycopersicum) a crop of high commercial value and nutriti on, that is culti vated in Sri Lanka during both agricultural seasons. These two components when added to diluted Bitt ern were able to provide nutrients that Bitt ern did not contain. Certain combinati ons of rati os of the three components were revealed to be more successful than others with the combinati on of Bitt ern 25%, Gliricidia leaf pulp, and Vermi-wash 25% leading to a 63% overall increase in growth parameters, surpassing the increment of its respecti ve control group. This indicated that Bitt ern could be uti lized to develop a substi tute for expensive inorganic ferti lizers by pairing it with other low-cost, organic nutriti onal sources such as Gliricidia sepium and Vermi-wash. This may also be a more environmentally friendly substi tute for syntheti c ferti lizers.
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    PublicationOpen Access
    Image processing techniques to identify tomato quality under market conditions
    (Elsevier B.V., 2024-03) Abekoon, T; Sajindra, H; Jayakody, J．A．D．C．A．; Samarakoon, E．R．J; Rathnayake, U
    Tomatoes are essential in both agriculture and culinary spheres, demanding rigorous quality assessment. It is highly advantageous to discern the maturity level and the time range post-harvesting of tomatoes in the market through visual analysis of their images. This research endeavors to forecast tomato quality by accurately determining the maturity level and the duration post-harvest, specifically tailored to Sri Lankan market conditions, with a particular focus on Padma tomatoes. It identifies maturity stages (Green, Breakers, Turning, Pink, Light Red, Red) and post-harvest dates using image processing techniques. Greenhouse-grown Padma tomatoes mimic market conditions for image capture, and Convolutional Neural Networks facilitate this analysis. Model 1, using ReLU and sigmoid activation functions, accurately classifies tomatoes with 99 % training and validation accuracy. Model 2, with seven classes, achieves 99 % training and 98 % validation accuracy using ReLU and softmax activation functions. Integration of the IPGRI/IITA 1998 classification method enhances tomato categorization. Efficient tomato image screening optimizes resource use. This study successfully determines Padma tomato post-harvest dates based on maturity stages, a significant contribution to tomato quality assessment under market conditions.
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    PublicationOpen Access
    A case study on identification and assessment of postharvest losses of tomato (Lycoperisicon escuentum Mill)
    (Postgraduate Institute of Agriculture, University of Peradeniya: Peradeniya, 1992) Rupasinghe, H. P. V; Peiris, C. N; Wijeratnam, R. S. W
    A study was undertaken to quantify and identify the causes of the postharvest losses of tomato during the Malta season of 1991. In the first phase of the study a suivey was earned out using random samples to collect information on the present system of posthaivest handling of tomato. Four major stages of the posthaivest marketing sequence were identified, namely; fann gate, collection agent, Manning wholesale market (Colombo) and exporter respectively. Loss assessments were conducted at these stages. Tlie survey revealed that pest and diseases such as pod borrer (Heliolhis zea) attack and blight (Altemuiia solani and Pliyiopluliora infestans) are the major contributions for posthaivest losses at the fann gate. Over maturity at hanest, bird attack and losses due to sun scorch were also obseived. Cultivating small extents of land (66% of farmers possess less than half acre) increases the liaircsting interval which resulted in a high percentage of over maturity. Tlie above factors subsequently made considerable losses at the collection agents when soiling the product for transportation. Significant losses were observed al the Manning market due to long distance of transportation with improper handling and transportation. Tlte main problem with exporters was the lack of uniformity of product with respect to maturity and size. Cumulative loss at the Manning wholesale market was obseived to be close to 54%. Contributions to the major causes of loss were as follows; mechanical damage due to over ripening 17.3%, pod borrer attack 23%, blight 4.8% and mechanical damage due to other factors 15%. Tlie cumulative loss and rejections after export quality selection was as high as 96%. Rejects due to non conformity to export specifications with respect to maturity, size and shape were 27.52% and 7.34%, respectively.
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    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.