النشر العلمي

  • Vegetative growth of some grapefruit cultivars, grafted on sour orange and grown in the heavy clay soils of Gezira State, Sudan

ABSTRACT

    The grapefruit (Citrus paradisi Macf.) is one of the most important citrus fruits in the Sudan.  The traditional grapefruit cultivar in the Sudan is “Foster” which is a pigmented cultivar, but very seedy.  The commercial importance of “Foster” around the world has declined because of its seediness. This experiment was conducted to evaluate the vegetative growth of grapefruit cultivars (as a source of scions) namely: Star Ruby, Rio Red, Frost Marsh, Flame, Little River, Red Blush, Davis, Wheeny, Pink Ruby, Sweetie and Ray Ruby. The cultivars were grafted on sour orange (Citrus aurantium L.), then they were grown on heavy clay soils in the horticultural nursery, Faculty of Agricultural Sciences, University of Gezira, Sudan. Planting date was 22 February, 2014. A randomized complete block design with three replicates was used with two seedlings in each plot. The measured parameters were plant height, number of branches/plant, length of branch, thickness of branch and thickness of scion and were recorded from February to December 2015. Results showed that Star Ruby recorded the longest plants, the longest branches, thickest scion and the largest number of branches/plant. Little River cultivar recorded the least vegetative growth. The most vigorous vegetative growth was recorded by Star Ruby cultivar grafted on sour orange in the heavy clay soils of Gezira State, Sudan. It is recommended to grow Star Ruby cultivar in the heavy clay soils as a source of scion.

 

published in SinnarUniversity Journal (SUJ) Volume5, Issue No.2: (2017)

  • Effects of sowing date on vegetative growth, yield and storability of two onion (Allium cepa L.) cultivars in the River Nile State, Sudan

ABSTRACT

 

     Onion is one of the most important vegetable crops in the Sudan. Sowing date and cultivars are crucial factors for onion production and storability in the River Nile State. Therefore, the objective of this study was to determine the effects of sowing date onvegetative growth, yield and storability of the two onion (Allium cepa L.) cultivarsBaftaim and Abuferwa in the River Nile State, Sudan. Experiments were carried out at Shendi Research Station farm during two consecutive seasons of 2014/15 and 2015/16. Treatments consisted of three sowing dates, which were first week of December, January and February. Treatments were arranged in a split- plot design with three replicates. Main plots were assigned to the sowing dates and sub-plots to the cultivars. Results showed that the first week of December sowing date significantly resulted in the most vigorous vegetative growth and the highest total yield in both seasons. The cultivar Baftaim had more vigorous vegetative growth, larger bulb size and higher total yield than the local cultivar Abufrewa in both seasons. However, Abufrewa cultivar had higher dry matter content and better storability than Baftaim. Early transplanting of onion in the first week of December resulted in higher postharvest losses than late transplanting in both seasons. It is recommended to transplant Baftaim cultivar in the first week of December for immediate marketing and Abufrewa in the first week of February for long term storage.

published in Gezira j. of agric. sci. 15 (2): 21-35 (2017)

  • Evaluation of a pneumatic precision planter Performance for direct seeding of onion (Allium cepa L) on raised beds under Gezira conditions, Sudan

ABSTRACT

This experiment was conducted at the Experimental Farm of the Facultyof Agricultural Science, University of Gezira (latitude ) to investigate the possibility of direct seeding of onion on raised beds of the Gezira clay soil. Four main direct seeding methods of onion were tested, using a pneumatic precision planter and compared with the traditional transplanting method. The treatments were seeding at 4km/hr (S4) with covering device,  seeding at 4km/hr without covering device, seeding at 7km/hr (S7) with covering device, planting at 7km/hr without covering device and control (transplanting). A randomized complete block design (RCBD) was used with four replications. Results showed that onion seeds could be directly sown by the pneumatic precision planter on raised beds using 7km/hr speed. Although all the methods gave plant population far below the recommended, no significant differences were found among treatments. With regard to bulb diameter, yield and number of bulbs, the direct seeding methods gave the best results compared with the conventional method. Plant population was not significantly different between the conventional method and S7 treatment.

published in SinnarUniversity Journal (SUJ) Volume5, Issue No.2: (2017)

  • Evaluation of the traditional method of onion transplanting under Gezira conditions, Sudan

ABSTRACT

Onion is one of the most important vegetable crops in the Sudan. The Gezira State is the largest producer of onion in the country. However, onion transplanting is the most expensive and labor demanding item of all cultural practices. This work was conducted in the Gezira State to evaluate the traditional method of onion transplanting compared to direct seeding. Data about onion cultural practices and their cost were collected using a questionnaire. The SPSS was used for the analysis of the questionnaire data. Results showed that 90% of the farmers used the conventional method of land preparation, 70% of them adopted pre-watering and  80% of them  used a seed rate of about 6 kg/ha. Results showed that 50% of respondents irrigated transplants immediately after transplanting a given area at the end of the day. Most of the farmers (80%) used manual weeding in the nursery, while 10% of them used herbicides and 10% used both manual and herbicidal weed control. About 70% of the farmers transplanted onion seedlings within 43-49 days after sowing in the nursery. The study showed that transplanting comprised the highest cost of the cultural practices (3793 SDG/ha) followed by weeding (2601 SDG/ha) and seeds (1500 SDG/ha). Forty percent of the farmers estimated plant population at 50 plants/m2. It is recommended to carry out more research work on the feasibility of direct seeding of onion.

published in SinnarUniversity Journal (SUJ) Volume5, Issue No.1: (2017)

  • Physico- Chemical Analysis of Fruits from Selected Guava(Psidium guajava L.) Trees Grown Under the Gezira Conditions, Sudan

Abstract Field surveys were conducted in guava private orchards around Wad Medani town (Hantoub, Gazeerat Elfeel and Douneib) during November 2006 to identify some of the superior guava trees. Nine guava trees were selected from these orchards according to their history of high yield and healthy vegetative growth, recognized by the growers. Fruits of these trees were harvested at ripe stage and analyzed for physical and chemical characteristics. Physical analysis consisted of fruit weight, length, width, size, skin and flesh colour. Chemical analysis consisted of TSS%, total acidity and vitamin C. The study showed significant variation in almost all physical and chemical characters of guava fruits among different selected trees. The tree “Douneib-1” showed the highest vitamin C content (82.4 mg/100 ml juice), followed by “El-Toum-3” (62.5 mg/100 ml juice). “Burae” tree, recorded the highest TSS% (17%). “Umdah” scored the highest TA (0.31 g of citric acid/100 ml of juice) while El Toum-3 registered the lowest TA (0.20 g of citric acid /100 ml of juice). Fruits of the selected trees showed different skin, flesh colour and size. Guava in the Sudan has high genetic variations because the only method of guava propagation is seeds. The selected tree Douneib-1 was superior in its physico-chemical characteristics and is recommended to be propagated.

published in [ISSN 1858-6139] 2017 مَجلَّةُ جامعة بخْت الرضا العلميَّة العذد التاسع عشر 19 University of Bakht Alruda Scientific Journal Issue No 19 2017

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