Thesis (M.Sc.) - Cairo University - Faculty of Agriculture - Department of Pomology

This study was conducted during two growing seasons (2017 and 2018) on 8 years old "Keitt" mango trees grown at El Behera Governorate, Egypt. It was aimed to study the effect of irrigation levels (100%, 85%, 70%) of irrigation requirements and shading levels (60%, 40%, 0%) on the growth and productivity of "Keitt" mango. The results showed that decreasing irrigation level up to 70% irrigation requirement decreased malformed panicle %, powdery mildew infection%, fruit set, fruit numbers, fruit retention, leaf area and yield but it increased vitamin2C3 content, fruit brightness, leaf chlorophyll concentration and proline leaf content. On the opposite side, increasing shading levels up to 60% increased fruit set, fruit retention%, powdery mildew infection %, leaves number, leaf area and relative water content but it decreased sunburn damage %, leaf chlorophyll concentration and proline leaf content. Moreover, 85% irrigation requirement under 40% shading achieved the best results in this regard. It recorded a significant increase in fruit set, fruit number, yield, leaf chlorophyll concentration, leaf area, water use efficiency and proline leaf content, compared to the control (100% irrigation requirement without shading). In addition, it decreased powdery mildew infection % and sunburn damage %. Uunder deficit irrigation (70% irrigation requirement) conditions shading practices at 40% succeced in increasing the yield more than 20% as mean of the two seasons

Issued also as CD