Effect of foliar calcium and nitrogen treatments on yield and fruit quality of table grapes cv. Cardinal
Journal
Agro-Knoeledge Journal
Date Issued
2023
Author(s)
Poposka, Hristina
Mukaetov, Dusko
Nedelkovski, Dusko
Gjorgjijevska, T., Milena
DOI
10.7251/AGREN2303091P
Abstract
The foliar fertilization has been used as an important agrotechnical
measure to avoid deficiencies and to improve quality. During the three
consecutive years, a study has been performed on Vitis vinifera L. (cv. ‘Cardinal’)
to examine whether a yield and grape berry quality have been affected by the
foliar application of Ca and N fertilizers. A liquid mineral fertilizer containing
40% Ca(NO₃)₂ as Variant I and 31% N with 0,015 % Fe-chelate; 0,01 % Mg –
chelat as Variant II (in text) has been sprayed four times during the growing
period (before and after blooming, buckshot berries, and verasion). Results
showed that foliar application of calcium and nitrogen increased the yield of table
grapes in all three years of research, in comparison with a control variant. The
highest yields of grapes in all three years of investigations were achieved in
Variant II – 4.57 kg/vine (14.85 t/ha). During the tree years of investigations, the
largest mass of grape bunch and berries were recorded in Variant II (382g and
368.68g), while the lowest cluster weight was in the control variant (344g and
330.92g). With a reference to the mechanical properties of the grape berries, the
highest resistance to pressure (2229.70g) and breaking resistance (364.52g) were
found in Variant I, treated with Ca fertilizer. The foliar application significantly
affects the mechanical properties (resistance of the berry to pressure and
breaking), especially in Variant I. The application of different types of foliar fertilizers did not have any significant effect on sugar contents and total acids,
compared with the control variant.
measure to avoid deficiencies and to improve quality. During the three
consecutive years, a study has been performed on Vitis vinifera L. (cv. ‘Cardinal’)
to examine whether a yield and grape berry quality have been affected by the
foliar application of Ca and N fertilizers. A liquid mineral fertilizer containing
40% Ca(NO₃)₂ as Variant I and 31% N with 0,015 % Fe-chelate; 0,01 % Mg –
chelat as Variant II (in text) has been sprayed four times during the growing
period (before and after blooming, buckshot berries, and verasion). Results
showed that foliar application of calcium and nitrogen increased the yield of table
grapes in all three years of research, in comparison with a control variant. The
highest yields of grapes in all three years of investigations were achieved in
Variant II – 4.57 kg/vine (14.85 t/ha). During the tree years of investigations, the
largest mass of grape bunch and berries were recorded in Variant II (382g and
368.68g), while the lowest cluster weight was in the control variant (344g and
330.92g). With a reference to the mechanical properties of the grape berries, the
highest resistance to pressure (2229.70g) and breaking resistance (364.52g) were
found in Variant I, treated with Ca fertilizer. The foliar application significantly
affects the mechanical properties (resistance of the berry to pressure and
breaking), especially in Variant I. The application of different types of foliar fertilizers did not have any significant effect on sugar contents and total acids,
compared with the control variant.
Subjects
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