The effect of nitrogen on the growth and development of grafted cuttings from the nursery

The complex of agrotechnical measures that ensure a high yield of standard planting material and a favorable impact on the growth and development of woody plants is represented by both the grafting technique and the nutritional elements applied in the nursery. This paper studies the effect of nitrogen on the growth and development of grafted cuttings of four table grapes cultivars 'Argessis', 'Norocel', 'Memory', and 'Ștefănești', grafted on SO4-4 rootstock, planted in the nursery located on a specific soil of Stefanesti Arges viticultural center. After forcing, the grafted cuttings were paraffined with silver paraffin planted in a protected (solar) space, and subjected to 2 fertilization treatments with increased doses of nitrogen: 100 of the Optimal Dose and 75% of the D.O. Increased amounts of nitrogen positively influenced vegetative growth but Șinhibited root development, regardless of the cultivar. The length of the main shoots oscillated between 43.36 cm when applying 100% DO fertilization to the 'Argessis 'cultivar and 17.88 cm for 75% D.O. fertilization, to the 'Memory' cultivar. On the other hand, the total 100% D.O. fertilization led to a decrease in the diameter of the roots, for the first 3 main roots measured.