Effect of microelements, amino acids and humic acid on growth, flowering and fruiting of some mango cultivars
2011
Radwan, S.I.M.
This investigation was carried out during two successive seasons (2008/2009 and 2009/2010) on 6 years old Keitt and Ewais mango (Mangifera indica .L). The trees are grown in a sandy soil under drip irrigation system. The treatments were: T1: 0.5 g Tradecorp AZII/I., T2:0.5g Tradecorp AZII/I + 40 cm Helpstar/tree., T3: 3cm Delfan/l., T4: 3cm Delfan/l + 40 cm Helpstar/tree., T5: 3cm Aton AZ plus/I., T6: 3cm Aton AZ plus/l + 40 cm Helpstar/tree., T7: 40cm Helpstar/tree., T8: Control (sprayed with water). The results indicated that both cultivars sprayed by½g Tradecorp AZII/I and soil supplementation by 40 cm Helpstar/tree produced the highest values of growth cycle number, shoot length, diameter of newly formed shoots, leaf length, leaf width and leaf area comparing with other-treatments used in the two seasons. Ewais mango cultivar produced the highest malformation percentage and setting fruits number than Keitt mango cultivar in both seasons. Whereas, retained fruits% was higher with Keitt mango cultivar in the two seasons. Keitt mango cultivar sprayed by ½g Tradecorp AZII/I with or without 40 cm Helpstar/tree produced the lowest malformation% in the two seasons. In addition, spraying ½ g Tradecorp AZII/I + soil supplementation by 40 cm Helpstar/tree significantly increased the yield per tree of the two cultivars. Adding 40cm Helpstar/tree only or with spraying ½ g Tradecorp AZII/I improved fruit weight, fruit length, fruit width, fruit size and fruit firmness in the two seasons. Spraying ½ g Tradecorp AZII/I with soil supplementation by 40 cm Helpstar/tree with Ewais fruits gave the highest significant fruit total soluble solids, total sugar % and lowest acidity% comparing with other interactions used in the two seasons. Adding 40cm Helpstar/tree as soil supplementation only or with spraying 3cm Delfan/l improved leaves N, Ca and total amino acids content of both cultivars.
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