The impact of nitrogen fertilization on raspberry yield quality under high temperature conditions
DOI:
https://doi.org/10.59463/jg8ntj24Keywords:
ammonium nitrate, dry matter content, fruit quality, titratable acidityAbstract
Raspberry (Rubus idaeus L.) fruits are highly appreciated by consumers due to the taste but also for the benefits it has on human health. In recent years, in Romania, the areas cultivated with raspberries have increased due to market demand but also due to the profitability of the crop. Raspberry fruit is rich in vitamins and fiber, which attracts consumers looking for healthy living [5]. In this study, were monitored the effects of the nitrogen fertilizers, in different doses, on the quality of the fruits. The results in correlation with the high temperatures of the harvest period. The mineral fertilizer, ammonium nitrate, was chosen according to the soil analysis and had been used in three doses: 30, 60 and 90 kg/ha N active substance. A number of 5 samples were extracted from the harvested fruits, Heritage and Meeker variety, and subjected to laboratory analysis to determine: soluble dry matter, titratable acidity, total dry matter, average fruit weight. The application of high doses of fertilizer led to an increase in raspberry production, bigger fruits, but lower dry matter 11.6%. The highest dry matter content was obtained in the case of the unfertilized variant 14.97%. Titratable acidity was not influenced by the application of fertilizers, but there was a decrease due to the high temperatures during the harvest period. The application of nitrogen fertilizers led to higher yields. The high temperatures during harvest period have substantially changed the fruit quality indices.
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