النشر العلمي

  • Current status of tomato greenhouse production in Khartoum and Gezira States, Sudan.

ABSTRACT

 

Tomato production under protected cultivation hasincreased consistently in recent decades in the Sudan. The objective of this study was to investigate the current situation of tomato cultural practices in existing greenhouses in Khartoum and Gezira States.A survey was carried out using a questionnaire and interviews with greenhouse owners in Khartoum and Gezira States. Khartoum and Gezira States have about 68 greenhouse projects,33 of them were selected for the study. Data were collected during 2013 and analyzed using statistical package for social sciences (SPSS). Results indicated that a large number of introduced tomato cultivars were used for productionand mostof greenhousefarmers (48.5%)sow tomato seeds in mid-February. The majority of farmers (63.6%) grow tomato in high plant density (30cm).More than half of greenhouses (75.8 %) hadno specific fertilizer programs. Most of the greenhouse farmers (90.9 %) prune weekly. All greenhouse farmers used pesticides for pest control. Our observations indicated that most of the growers failed to produce summer tomato.Accordingly, further research in tomato greenhouse production is needed.

published in مجلة الجزيرة للعلوم الزراعية 14, 2, 2016

  • Status of greenhouses in Khartoum and Gezira States, Sudan

ABSTRACT

 

Greenhouse technology facilitates the cultivation of most horticultural crops in any region of the world, provided that the greenhouse is properly designed and equipped to control environmental conditions. The objective of this study was to investigate the characteristics of greenhouses in Khartoum and Gezira States, Sudan, and show their drawbacks and disadvantages.A survey was carried out using a questionnaire and interviews with greenhouse owners in Khartoum and Gezira States. Khartoum and Gezira States have about 68 greenhouse projects, 33 of them were selected for the study. The data were collected during 2013 and were analyzed using statistical package for social sciences (SPSS) computer program. Results showed that 69.7% of greenhouses were privately owned and the vast majority of greenhouses were used to produce vegetable crops or seedlings. Results indicated that most of the greenhouses designs are not suited to the hot arid tropics of the Sudan. More than half of greenhouses had the arched system, most of them were covered by polyethylene, 69.7% of greenhouses were constructed in a single span, 72.7% had a single door, 76.3% of greenhouses had a height between 2.5 m to 3 m and 42.6% of them were 40m long. Accordingly, an ideal greenhouse design is needed in which all the drawbacks and shortcomings are corrected to suit the arid conditions of central Sudan.

 

published in مجلة الجزيرة للعلوم الزراعية 14, 2, 2016

  • Effects of nitrogen source, rate and foliar application on some leaf mineral nutrient contentsand yield of “Sinnari” sweet oranges (Citrus sinensis L.) in the River Nile State, Sudan

ABSTRACT

 

      Sweet orange production in the Sudan is characterized by low yield and poor fruit quality. This research was aimedat determining the effects of nitrogen source, rate and foliar application on some leaf mineral nutrient content and yield of “Sinnari” sweet oranges in  the River Nile State during 2010/11 and 2011/12. Nitrogen sources were urea (100%), sheep manure (SM) (100%), or a combination of them (50% each), beside Wuxal foliar fertilizer. Nitrogen rates were 0, 43 and 86 kg N/ha. Treatments were arranged in a randomized complete block design with three replicates and 2 trees/plot. Results showed that nitrogen sources and rates were effective in increasing leaf nitrogen content and the highest values were obtained by the application of 86 kg N/ha using urea (100%) or a combination of urea and sheep manure. Application of Wuxal foliar fertilizer resulted in a significant increase of Zn and Fe leaf contents and total yield. Nitrogen source had significant effects on yield components and total yield. The highest values were obtained by a combination of urea and sheep manure or 100% urea, and the lowest values were recorded for 100% sheep manure. Nitrogen rate of 86 kg N/ha resulted in the highest yield components and total yield. It is recommended to fertilize sweet orange trees in the River Nile State with a combination of urea and sheep manure at the rate of 86 kg N/ha (12.4 kg SM/tree and 0.5 kg urea/tree)in addition to Wuxal foliar fertilizer.

published in مجلة الجزيرة للعلوم الزراعية 14, 2, 2016

  • Effects of maturity stage, packaging and waxing on quality and shelf life of lime (Citrus aurantifolia L.) fruits

ABSTRACT

        Post-harvest handling practices of lime fruits are very poor in Sudan. Limes are usually harvested at different maturity stages and packed in used jute sacks which subjects them to physical injury manifested in bruises and blemishes. Therefore, the objective of this work was to study the effects of maturity stage at harvest, packaging and waxing on the quality and shelf life of lime fruits. Experiments were conducted at the Faculty of Agricultural Sciences, University of Gezira, Wad Medani, Sudan, during the winter season of 2012 and the summer season of 2013. Lime fruits were harvested at three maturity stages; green, greenish-yellow or yellow. Fruits were packaged in intact or perforated polyethylene film, waxed or left unpackaged and unwaxed as control. Packaged, waxed or control fruits were placed in cartons and kept at ambient conditions. Treatments were arranged in a completely randomized design with three replicates. Maturity stage had significant effects on weight loss, total soluble solids (TSS) and vitamin C content, but had no significant effects on titratable acidity (TA) in both seasons. Lime fruits harvested at the yellow stage lost more weight and had higher TSS content than those harvested at the two other stages in both seasons. However, lime fruits harvested at the green stage had a longer shelf life and a higher vitamin C content in both seasons. Packaging and waxing treatments had significant effects on weight loss, TSS, TA and vitamin C content in both seasons. Packaging lime fruits in intact polyethylene film resulted in the lowest weight loss, followed by perforated film and waxing. The highest weight loss was recorded in the control treatment in both seasons. The highest TSS and TA values were recorded in fruits packaged in perforated film and control. However, the highest vitamin C content and the longest shelf life were found in fruits packaged in intact film followed by perforated film and waxing treatments and the lowest values were recorded in the control in both seasons. It could be concluded that, in order to prolong the shelf life and maintain the quality of lime fruits, they should be harvested at the green stage and packaged in cartons lined with thin intact polyethylene film or coated with wax. 

published in مجلة السودان للعلوم الزراعية 2016

  • Effects of packaging and waxing on fruit quality and shelf life of some introduced mango cultivars

ABSTRACT

 

   Mango is one of the most important fruit crops in the Sudan. It is annually exported to Saudi Arabia, Gulf States and Western Europe. Recently, some internationally popular cultivars have been introduced to the Sudan. The objective of this research was to determine the effects of packaging and waxing on postharvest fruit quality and shelf life of some introduced mango cultivars from South Africa. Treatments consisted of three introduced mango cultivars; Tommy Atkins, Kent and Keitt and the local cultivar Abusamaka. Packaging treatments consisted of intact polyethylene film, perforated film, waxing and control. Treatments were arranged in a completely randomized design with three replicates. Data taken consisted of weight loss, total soluble solids (TSS), titratable acidity (TA), vitamin C and shelf life. Results showed that Abusamaka cultivar had the highest weight loss and Keitt had the lowest in both seasons. Packaging mango fruits in intact polymeric film resulted in the lowest weight loss, followed by perforated film, waxing and the highest weight loss was recorded for the control in both seasons. Abusamaka cultivar had the highest vitamin C and TA contents but had the lowest TSS content. However, Tommy Atkins had the highest TSS content but the lowest vitamin C and TA contents in both seasons. The longest shelf life was shown by Keitt cultivar, followed by Kent, Abusamaka and the shortest shelf life was recorded for Tommy Atkins in both seasons. Packaging mango fruits in intact polymeric film resulted in the lowest TSS, the highest TA, the highest vitamin C content and the longest shelf life. However, the highest TSS, the lowest TA, the lowest vitamin C and the shortest shelf life were recorded for the control. It is recommended to grow Keitt cultivar, harvest fruits at the mature green stage and package them in intact polymeric film or waxed to increase their shelf life and improve their quality.

published in مجلة الجزيرة للعلوم الزراعية 14, 1, 2016

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