Nutritional status and fruit physical and chemical properties of Succkart mango trees grown in clay
soil under Aswan Governorate conditions, Egypt in response partial replacement of mineral nitrogen by using
pigeon manure tea + Spirulina plantensis algae were investigated during 2018 and 2019 seasons. Replacement of
mineral N by using pigeon manure tea + Spirulina plantensis were very effective in improving all leaves mineral
contents (macro elements; N%, P%, K% and Mg % and micro nutrients; Fe, Zn, and Mn ppm). However, nonsignificant differences were observed in leaves Cu contents. Furthermore, fruit physical properties (in terms of
fruit length, fruit diameter & pulp/fruit ratio) and chemical properties (in terms of increasing TSS%, reducing,
total sugars % & vitamin C contents and decreasing total acidity%) were improved. This positive effect continually
until replaced 40% of mineral N fertilizer by using 20% pigeon manure tea + 20% Spirulina plantensis. However,
gradual increasing of mineral N replaced ratio from 40% to 100% caused a gradual and significant decrement in
all leaves mineral elements, fruit physical and chemical properties. However, the trees received 60% mineral N +
20% pigeon manure tea + 20% Spirulina plantensis present the best results. Contrary, the trees received 0.0%
mineral N + 50% 50% pigeon manure tea + 50% Spirulina plantensis present the lowest contents of macro and
micro elements as well as fruit physical and chemical properties.