The effect of mineral and organic fertilization on reproductive parameters of sour cherry

Aneliya Zdravkova

Abstract: The investigation was carried during the period 2013-2016 at the Institute of Agriculture – Kyustendil, Bulgaria with sour cherry (Prunus cerasus L) cv. Erdi Bötermö. The orchard plantation was established in 2006. Planting distances were 5x4 m. The soil was severe leached cinnamon forest (Chromic Luvisols). Fertilization treatments were: V1 – non-fertilized (control); V2 – ammonium nitrate 24,24 kg/da N; V3 – ammonium nitrate 30,30 kg/da N; V4 - chicken manure -125 kg/da + foliar fertilizer SoftGuard++ - 120 ml/da; V5 – chicken manure - 250 kg/da. Average for the period ammonium nitrate 24,24 kg/da N application increased the yield with 19,06% and ammonium nitrate 30,30 kg/da N - with 22,59% compared to the control. Ammonium nitrate fertilization of the rate of 30,30 kg/da N increased the yield of cv. Erdi Bötermö sour cherries statistically proven in the third year of the investigation. Chicken manure 250 kg/da application increased the yield with 20,66%. Fertilizing with ammonium nitrate 30,30 kg/da N rates increased the average fruit weight by 2% with sour cherry cv. Erdi Bötermö. In the third year of the study the relationship between the yield and the fertilizer rate was strong positive - the values of the Pearson coefficient (r) were 0,994 by ammonium nitrate and 0,984 by chicken manure treatment. In all treatments the correlation between the yield and the average fruit weight was negative and correlations dry matter-sugars, dry matter-acids and sugars-acids were positive.

Keywords: average fruit weight; correlation coefficient; mineral and organic fertilization; sour cherry; yield

Date published: 2020-10-22