1. Ph.D. Scientist, Dept. of Tree Physiology, Research Institute for Fruit Growing—ICDP Pitesti-Maracineni, comuna Maracineni, 117450 Judetul Arges, Romania.
2. Ph.D. Scientist, Dept. of Soil Physics and Technology, National Research Institute for Soil Science, Agrochemistry and Environmental Protection—ICPA Bucharest, Bd-ul Marasti, No. 61, Sector 1, 011464 Bucharest, Romania (corresponding author).