THE INFLUENCE OF THE VARIATION OF MAIN CLIMATIC FACTORS ON THE FRUITING PROCESSES OF PLUM, ON DIFFERENT FERTILIZER MANAGEMENT SYSTEMS
Simulating fruit yields has a special importance for a more precise zoning of different fruit species and varieties. To achieve this objective for Anna Späth plum cultivar widespread in Romanian fruit growing, some research at the Research Institute for Fruit Growing Pitesti has been done. The experimental data used in this paper have been obtained in the period 1990-2009. The experiment has been organized in an orchard established in 1984, located on a brown podzolic soil. The trees were planted at 5 m space between rows and 4 m along the row, being grafted on myrobolan rootstock. A data base consisting of 42 years of daily weather data of Pitesti area was used in this study for a statistically based model. In order to emphasize the correlations between meteorological factors and trees biological parameters, the multiple linear regression method was used. Fruit yield was more intensively correlated with the fruit number per tree than with the average fruit weight. The percentage of fruit set was positively influenced by an increase in sunshine hours and precipitation during May; minimum temperature and air humidity during April, while a negative influence was exerted by the minimum temperature during May. The number of flowers per tree was negatively influenced by an increase in air humidity during July, maximum temperature during June, sunshine hours during July and precipitation during June, all referred to the previous year, while a positive influence was exerted by minimum temperature of June of the previous year. Using the correlation based model of this paper, a climatic potential fruit yield could be estimated in order to carry out o more precise zoning of plum crop under similar soil and climate conditions.
Iancu, M., Chitu, E. and Sumedrea, D. (2013). THE INFLUENCE OF THE VARIATION OF MAIN CLIMATIC FACTORS ON THE FRUITING PROCESSES OF PLUM, ON DIFFERENT FERTILIZER MANAGEMENT SYSTEMS. Acta Hortic. 981, 255-262
fruit set, number of flowers / tree, multiple linear regression