Effect of spraying some chemical substances on flowering, fruit set, fruit drop, yield and fruit quality of Taimour mango trees

摘要

Mature Taimour mango trees were sprayed with different chemical substances during 1992/93 and 93/94 seasons. Results indicated that application of NAA at 200 ppm + ethrel at 500 ppm once in November per season as well as S_(3307)D at 500 ppm + ethrel at 500 ppm twice in December per season advanced the time of flower bud opening and gained the lowest percentage of malformed panicles, greatest percentage of perfect flowers and lowest sex expression ratio (male/perfect). In addition, they reduced fruit drop % at pea stage and maximized fruit retention% at harvest stage and also increased tree yield than the control in both seasons. Moreover, these treatments increased fruit and pulp weight, TSS% and TSS/acid ratio in fruit juice, but failed to affect significantly fruit diameter, fruit shape, seed weight and acidity % in fruit juice.