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University of Gezira (2016)

Current Status of Greenhouses and Improvement of their Design for Tomato Production in the Arid Tropics of the Sudan

Aalim, Sahar Salih Ibrahim

Titre : Current Status of Greenhouses and Improvement of their Design for Tomato Production in the Arid Tropics of the Sudan

Auteur : Aalim, Sahar Salih Ibrahim

Université de soutenance : University of Gezira

Grade : Doctor of Philosophy in Horticultural Science 2016

Résumé
In recent years, there has been an increase in the number of greenhouses for commercial production of horticultural crops in the Sudan, mainly during the hot summer months of the year. A survey using a questionnaire and interviews of 50% of greenhouse projects in Khartoum and Gezira States was conducted to investigate the characteristics of greenhouses and show their drawbacks and disadvantages. Results indicated that most of the greenhouses were not suited to the hot arid tropics of the Sudan. Use of the arched system, presence of a single door, the height and length of the greenhouse were among the drawbacks and shortcomings of the greenhouses. Results also indicated that most of the growers failed to produce summer tomato due to the shortcomings of the designs and lack of standard cultural practices for tomato production in greenhouses. There was also a heavy use of pesticides to control pests. Accordingly, an improved greenhouse in which all the drawbacks and shortcomings were corrected was designed and tested for summer tomato production compared to the existing greenhouses. Dimensions of the newly designed improved greenhouse were 24 m x 9.6 m x 4 m, it was upright instead of arched and provided with a double door. The cooling pad was placed 60 cm above the ground. Experiments were conducted in Bayda, north of Wad Madani, Gezira State, Sudan, for two summer seasons to compare the newly designed improved greenhouse with three traditional detached greenhouses in 2015 and one traditional detached greenhouse in 2016 for tomato growth and yield. The variation in temperature between the newly designed improved greenhouse and the traditional greenhouses was more than 5C° and the variation in relative humidity was more than 20%. The modification of microclimate and absence of pests in the newly designed greenhouse resulted in a highly significant increase in tomato growth parameters and total yield. The low percentage of flowering, lack of fruit set and invasion of pests caused complete loss of tomato production in traditional greenhouses. It can be concluded from this study that the newly designed improved greenhouse is better suited to the hot arid tropics of The Sudan and can be used successfully for tomato production through the year.

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