ATTEMPTS TO IMPROVE GROWTH AND PRODUCTIVITY OF SUCCKARY MANGO TREES BY USING PIGEON MANURE TEA AND Spirulina plantensis ALGA

Abstract

A field experiment was carried out during two successive seasons 2017/2018 and 201/2019 with the object of improving the vegetative growth and fruiting of 15-years old Succkary mango trees grown in private orchard located at Edfu district, Aswan Governorate-Egypt. Partial replacement of mineral nitrogen fertilization by using pigeon manure tea and Spirulina plantensis fungi were examined. Higher and significant vegetative growth (in terms of shoot lengths, number of shoots/tree, number of leaves/shoot and leaf area) were associated with reduced the mineral N doses by using pigeon manure tea and Spirulina plantensis. However, Increasing the nitrogen replaced ratio over 60% (using 30% pigeon manure tea + 30% Spirulina plantensis) resulted a significant reduced in all vegetative growth parameterizes. Succkary mango Productivity (yield “kg/tree”, fruit number/tree and fruit weight “g”) significantly enhanced as a result of increasing the ratio of mineral N replaced by pigeon manure tea + Spirulina plantensis. On the opposite side, increasing the ratio of mineral N replacement over than 40% (using 20% pigeon manure tea + 20% Spirulina plantensis) caused a significant decrease in yield (kg)/tree and its components. Then, the present investigation recommended by recommended to replace 40% of mineral N by using 20% pigeon manure tea + 20% Spirulina plantensis in order to improve vegetative growth parameters, and trees productivity.