Response of sugarcane (Saccharum spp) ratoons to N rate applied in a single or a split dose under Guneid Sugar Scheme conditions

Salaheldin A. Mukhtar, Adam I. Adam, Abu Elhassan S. Ibrahim


Sugarcane in Sudan is grown in the central clay plain where the soils are mostly Vertisols. These soils are generally low in nitrogen (0.03 to 0.045%) and organic matter (<1.0%). Therefore, nitrogenous fertilizers are needed for sustainable production of sugarcane and other crops. It is known that an increase of N fertilizer is associated with an increase of each of the number of millable stalks, plant height, cane and sugar yields until an optimum rate is reached beyond which each of the above parameters is negatively affected (Dillewijn, 1952; Wiedenfeld, 1997). This is especially true for the quality parameters of the crop (Humbert, 1968). This was confirmed by Rattey and Hogarth (2001) who reported that commercial cane sugar was reduced as the rate of applied N increased. Urea (46% N) is the main N source for sugarcane and other crops in Sudan. Thus, determining the optimum rates of urea is necessary because of its increased price, high cost of transport, storage and application.

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