The Effect of Different Calcium Treatments on the Development of Bitter Bit of ‘Golden Delicious’ Apple Fruits

Bayan M. Muzher, Ola T. Al-Halabi, Naheda Bo-Hamda, Talat Amer, Ahsan Zeineyah, Rania Hnidi

Abstract


The study was carried out at Sweida Agricultural Scientific Research Center in Syria to determine the effect of different treatments on the development of bitter pit on apple fruit which includes : fertilization with calcium carbonate, foliar spray of calcium nitrate 5g/L, fertilization with calcium carbonate and foliar spray of calcium nitrate, dipping in 2% calcium chloride solution for apple fruits, and control. In addition, the susceptibility of leaves and fruits to sprays and dipping , and leaf mineral content were studied. Chemical analysis showed significant superiority of calcium nitrate on the other treatments concerning the reduction of K+Mg/Ca ratio in leaves (0.91) after the fourth spray, while the control revealed the highest ratio in August (after the third spray) which was (1.7). Also, the foliar spray of calcium nitrate significantly reduced the development of bitter pit on fruits (1%) comparing with the other treatments, except the treatment of fertilization of calcium carbonate and foliar spray of calcium nitrate (3%) on which significantly reduced the development of bitter pit than the control (11%), dipping with calcium chloride (9%), and fertilization with calcium carbonate (7%). Consequently, the foliar spray of calcium nitrate (four times) revealed the highest efficiency to increase the leaf calcium content and constrict developing of bitter pit on apple fruits in the comparison with the other treatments.

Keywords


Apple, Bitter pit, Calcium nitrate, Calcium carbonate, Calcium chloride, Leaf mineral content

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