INFLUENCE OF POST-SET SPRAY APPLICATION OF PUTRESCINE, KNO3 AND CPPU ON FRUITS NUMBER, DROP RATE, RETENTION AND QUALITY OF MANGO CV. ALPHONSO

Document Type : Original Article

Authors

Pomology Department, Faculty Of Agriculture, Cairo University

Abstract

This investigation was conducted on 20 year old mango trees ( Mangifera Indica L. ) cultivar Alphonso. Panicles were sprayed two weeks after fruit set with putrescine at 150, 300 or 450 ppm, KNo3 at 0.5, 1 or 2% or CPPU at 5, 10 or 15 ppm. Results indicated that  both putrescine and KNo3 significantly increased number of fruits per panicle. There was a direct relationship between the concentration and the number of retained fruits. putrescine recorded the lowest rate of fruit drop followed by KNo3 and CPPU. Putrescine treatments significantly increased percentage of fruit retention at harvest. CPPU treatments increased firmness, weight, length, diameter and width of the fruit. Putrescine and KNO3 increased TSS%. However, there was a negative association between the concentration of CPPU and TSS%. Fruit  acidity increased with CPPU and putrescine application. However, it decreased with KNO3. TSS/ Acid ratio increased with putrescine and KNO3. The highest value of vitamin C was recorded with 2% KNO3 and the lowest one occurred with CPPU at 15 ppm.   

Keywords

Journal of Plant Production
Volume 25, Issue 6
June 2000
Pages 3615-3630

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