Response of sugarcane ratoons to nitrogen rates and methods of application in Guneid Sugar Scheme, Sudan

Salaheldin A. Mukhtar


Three experiments were conducted during the periods 2007 to 2013 at the farm of the Sugarcane Research Center-Guneid (SCRCG), Sudan. The objective was to investigate the response of sugarcane ratoon crops to different rates of nitrogen in the form of urea in addition to splitting the rate during the long season of sugarcane

crop. The first experiment included 150, 200 and 250 kg urea/feddan            (feddan, f=4200m2). Treatments in the second experiment were zero, 50, 100, 150 and 200 kg urea/ f, while the third experiment consisted of zero, 100, 150, 175 and 200 kg urea/f, for the first, second and third ratoons. The treatments of the second experiment were coupled with splitting the dose of urea versus the full dose       (two thirds at the age of 20 to 30 days; and one third at the age of three to four months). Treatments were laid out in a randomized complete block design with four replicates in experiment I and III and a factorial arrangement for experiment II with four replicates. The results revealed that there were no significant differences in yield components and total cane yield of the ratoon crop between the rates of nitrogen of the first experiment. In the second experiment, yield components and total cane yield increased significantly for rates of urea from zero to 100, 50 to 150 and 100 to 200 kg urea/ f. In the third experiment, only cane yield increased with the increase of N rate but significant only between zero and 150 to 200 kg urea/f in the first ratoon, zero and 100 to 200 kg urea /f in the second ratoon, and zero and 100; 100 and 150 to 200 kg urea/f in the third ratoon. Brix, pol% cane and ERS%, decreased significantly with the increased rate of N in all experiments. No significant differences in yield and quality parameters were found in response to splitting the rate of N. The rates of 150 and 200 kg urea/f seemed satisfactory for both cane and sugar yields for the ratoon crops.  However, under field conditions where many factors interact it is seen as advisable to have some N reserves. In this sense, 200 kg urea /f is recommended as the dose to be endorsed as an official dose for the ratoon crops in the Guneid Sugar Scheme.

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