ISHS Acta Horticulturae 636: XXVI International Horticultural Congress: Key Processes in the Growth and Cropping of Deciduous Fruit and Nut Trees
EFFECT OF PROMALIN AND MIXTATOL ON FRUIT GROWTH, YIELD EFFICIENCY AND QUALITY OF 'STARKING DELICIOUS' APPLE |
| Authors: | K.K. Jindal, S. Pal, P.S. Chauhan, M.S. Mankotia |
| Keywords: | apple, gibberellins, cytokinins, bio-stimutant, fruit yield, fruit quality |
| Abstract:
The apple is the most widely grown fruit in the trans-Himalayan region. Apple production is now being affected by the changing climate. Apples grown in the mid hills area become misshapen due to high post-bloom temperatures, which cause a reduction in yield and quality and, consequently, these fruits command low returns in the market. Promalin (GA+CK) was sprayed at 50 per cent full king bloom and repeated at full bloom in single and split doses to ‘Starking Delicious’ apple. Mixtatol (a bio-stimulant) was applied at full bloom and repeated twice in the fruit development stage. Maximum fruit set and photosynthetic rates were obtained with 60 ppm Promalin applied in single doses. Mixtatol 10 ppm gave the highest yield when compared with control. Improvement of fruit shape, in the form of L/D ratio, calyx length and prominence of calyx lobe formation, were the most striking effects of Promalin and were significantly better than the control. Chemical constituents of the fruits, such as TSS, total sugars, soluble proteins and anthocyanin contents were increased while acidity was decreased in fruits of Promalin and Mixtatol treated plants. Thus the investigations revealed that the Promalin and Mixtatol treatments, when in areas exposed to warm weather during flowering and development, had improved the quantitative as well as qualitative parameters, which will help the farmers achieve good returns. | |
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