Response of (Miami) grapefruit (Citrus paradisl Macf.) to nitrogen and micronutrients as foliar fertilizers
2006
Babiker, S.I., Agricultural Research Corporation, Wad Medani (Sudan) | Elamin, O.M., University of Gezira, Wad Medani (Sudan) , Faculty of Agricultural Sciences | Elkashif, M.E., University of Gezira, Wad Medani (Sudan) , The National Institute for the Promotion of Horticultural Exports
Experiments were conducted in an orchard at Umsunut village near Wad Medani town, Sudan, during the seasons 2000/01 and 2001/02. The objectives of the study were to determine the effects of soil-applied N and micronutrients as foliar fertilizers on yield and fruit quality of (Miami) grapefruit. Treatments consisted of three N rates (0, 0.5 and 1.0 kg N/tree) and two formulations of micronutrients as foliar fertilizers, viz. Bayofolan and Hadaig Mekhlabi. The treatments were arranged in a randomized complete block design with three replications. Leaf N content was significantly increased with the application of soil-applied N and the highest values were obtained at 1.0 kg N/tree in combination with Bayofolan. Application of micronutrients as foliar fertilizers resulted in significant increases in leaf Zn, Mn and Fe. The highest yield was obtained with the application of soil-applied N at 1.0 kg N/tree in combination with Bayofolan. Fruit size, peel thickness, rag weight and juice volume were significantly in ceased as N rate was increased and the highest values were obtained at 1.0 kg N/tree in combination with micronutrients. Total soluble solids and ascorbic acid concentrations significantly decreased but citric acid increased as the rate of soil-applied N was increased. Micronutrients as foliar fertilizers had no significant effects on juice chemical composition. Grapefruits harvested in April had better fruit quality and juice chemical composition as compared to those harvested in January
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