Preliminary studies on fertilization of mango trees under U.A.E. conditions [electronic resources]: 1- response of alfons mango trees for organic fertilization "chicken manure".

Includes reference.

This study was done to investigate the possibility to use chicken manure as or-ganic fertilizer partially in supplying Alfons mango trees by nitrogen fertilization requirements through three consecutive seasons (2001, 2002 and 2003) at western farm of Dibba Al- Fujaira Fruit Research station, in eastern coast of United Arab Emirates (UAE) on 12 year old Alfons mango trees. The experiment contained five combinations between the two nitrogen fertilizer sources, organic (chicken manure) and inorganic (urea) at different ratios as follow (100 + 0%), (75 + 25%), (50+50%), (25 + 75 %) and (0 + 100 %). All these treatment had equal nitrogen amount (900 g actual nitrogen /tree /year). The important results could be concluded as follow: 1- Leaf dry mater percentage was not affected significantly by fertilization treatments through three seasons. 2- Leaf mineral content differences among treatments were decrease gradually from season to seasor. till it become insignificant differences in the third season (except the increment of potassium which increase by increasing organic fertilizer per-centage), may be this trend explain the beneficial of accumulative effect of organic fertilizer in this respect. 3- The differences among yield and fruit quality from season to season was increased from first to third season to become significant in the last season where the significant superiority of the two treatments of 50% & 25% organic nitrogen fertilizer source to increase yield weight and clear improvement of fruit qualities. It could be recommended to use chicken manure as nitrogen source of 25% or 50% from annual addition under the condition of this study. It has economic benefit by using secondary product and from healthy view point to reduce or prevent min-eral food human pollution and also environmentally to evasive of these wastes.

Summary in Arabic.

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