VEGETATIVE GROWTH AND YIELD DYNAMICS OF THE RASPBERRY CULTIVAR ‘OPAL’
ANALIZA INFLUENȚEI FACTORILOR CLIMATICI ȘI PEDOLOGICI ASUPRA CREȘTERII ȘI PRODUCȚIEI SOIULUI DE ZMEUR ,,OPAL”
DOI : https://doi.org/10.35633/inmateh-77-89
Authors
Abstract
This study provides an original contribution through an integrated analysis of the vegetative growth and yield dynamics of the raspberry cultivar ‘Opal’, conducted over two consecutive years (2023–2024) under the specific pedoclimatic conditions of the Băneasa area in Bucharest. During the planting year (2023), early vegetative growth was evaluated, while in the productive year (2024), vegetative, yield-related, and pedoclimatic parameters were analyzed. A comprehensive analytical approach was applied, combining polynomial regression models (R² > 0.95) with multiple regression and Pearson correlation analyses to investigate multifactorial relationships. The results revealed a pronounced seasonal asynchrony: yield reached a clear maximum in June (391.6 g per plant) and subsequently declined, whereas vegetative growth continued, indicating a marked reallocation of resources following fruiting. Yield showed a strong negative correlation with vegetative development (r ≤ -0.93) and positive correlations with solar radiation and soil moisture (r ≥ 0.78). The final multiple regression model, integrating plant height, stem diameter, solar radiation, and soil moisture, explained 99.8% of yield variability (R² = 0.998), demonstrating strong predictive capability. The findings provide a solid scientific basis for optimizing raspberry cultivation practices and support the development of more efficient yield systems adapted to local climatic variability.
Abstract in Romanian



