EFFECT OF PRE-HARVEST SPRAY OF GROWTH REGULATORS AT TURNING STAGE ON THE MATURITY OF BER FRUITS (ZIZYPHUS MAURITIANA LAMK.)

J.S. Bal, P.S. Kahlon, J.S. Jawanda, S.S. Sandhu
The investigations were conducted on the effect of ethephon, SADH, morphactin and TIBA at colour break stage to enhance maturity and uniform ripening of ber cv. Umran. The maximum percent maturation and colour development was observed with higher concentration of ethephon 400 and 500 ppm; SADH 2000 and 3000 ppm and morphactin and TIBA 50 ppm. Maximum breadth and weight of the fruit was found with morphactin at 10 ppm. The specific gravity when approached less than one, the fruits were in harvest maturity and attained golden yellow to deep golden yellow colour. The highest organoleptic rating of the fruits was noted in ethephon 400–500 ppm, SADH 2000–3000 ppm and TIBA 50 ppm. The higher concentration of ethephon and SADH induced more increase in total soluble solids with the corresponding decrease in acidity. The total phenolics were high in vitamin C and sugars were greatly increased with ethephon treatments and the maximum contents were recorded with 500 ppm ethephon. Spraying with ethephon 400, 500 ppm; SADH 2000, 3000 ppm; TIBA 25, 50 ppm and morphactin 25, 50 ppm increased starch degradation. The maximum total carotenoids were found in fruits sprayed with SADH 3000 ppm and ethephon 500 ppm.
Bal, J.S., Kahlon, P.S., Jawanda, J.S. and Sandhu, S.S. (1992). EFFECT OF PRE-HARVEST SPRAY OF GROWTH REGULATORS AT TURNING STAGE ON THE MATURITY OF BER FRUITS (ZIZYPHUS MAURITIANA LAMK.). Acta Hortic. 321, 318-325
DOI: 10.17660/ActaHortic.1992.321.33
https://doi.org/10.17660/ActaHortic.1992.321.33

Acta Horticulturae