Effects of irrigation , type of fertilizer and nitrogen rate on yield components and total yield of mango (Mangifera indica L.) in Abu Karshoula, South Kordofan State, Sudan

Sheikh Edin M. Ewida, Mohamed E. Elkashif, Osman M. Elamin

Abstract


An experiment was conducted at Abu Karshoula, South Kordofan State, Sudan, during the  seasons of 2009/10 and 2010/11, to determine the effects of irrigation, type of fertilizer and nitrogen rate on yield components and total yield of the local mango cultivar Kitchener. Treatments consisted of irrigated or non-irrigated trees. Types of fertilizer were urea, cow manure and a combination of urea and cow manure. Nitrogen rates were 0 kg/ha, 43 kg/ha and 86 kg/ha. The treatments were arranged in a split-split plot design with irrigation treatments as the main plots, type of fertilizer as the sub-plots and N rates as the sub-sub plots, replicated three times. Results showed that irrigation of mango trees significantly increased exportable yield, cull yield, number of fruits per tree and total yield, whereas, withholding irrigation from mango trees gave higher locally marketable and lower cull yields in both seasons. Nitrogen fertilizer in the form of urea produced the largest number of fruits per tree and the highest locally marketable  and total yields in both seasons. Combination of urea and cow manure significantly increased exportable yield in both seasons. However, nitrogen fertilizer in the form of cow manure  alone gave the lowest total yield and number of fruits per tree in both seasons. Application of N at the rate of 86 kg/ha coupled with irrigation significantly increased number of fruits per tree, cull, exportable and total yields.  Hence, it is recommended to irrigate mango trees and apply N in a combination of urea and cow manure at the rate of 86 kg/ha in order to increase total and exportable yields.


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