[automatically translated] The use of fertilizers slow effect is now widespread in agriculture. The advantage of these formulations, compared to the traditional ones, is their ability to continuously feed the plant, thanks to the particular structure of the granules, and to limit the nitrogen losses in the culture substrate. The solubilization of the fertilizers of the slow release or the release of the active ingredients of the formulations having controlled release are closely related microbial activity and to the temperatures of the culture medium, to which the plants can be found from the substrate different quantities depending on the environmental conditions. The research was conducted in order to evaluate the response of Nerium oleander L., widespread in the Mediterranean environment and much appreciated as a species by parks and gardens, fertilization with Ornamental (18: 6: 12; 18 S; 1 Fe) and Osmocote (18: 9: 10; 2 MgO), fertilizers, respectively effect a slow and controlled release, administered in cover or embedded in the substrate in pre Implantation. The experimental design used was the bill divided. The system was installed in February 2006, the plants were placed in a 18 cm diameter pots with 4 l capacity. The substrate was prepared by mixing peat (33%) and brown (33%) with perlite (34%). For each plant were administered 2.5 kg of fertilizer every m3 of substrate (3.75 g plant-1), regardless of the formulation and from the intake mode. The water supply was secured through a dispensing unit to microportata with drip lines with holes at 20 cm from each other (one per plant). In September, the plants were pruned to leave 3-1 plant buds. The oleander has responded well to the use of both formulations and methods of administration. The plants have noted a similar rate of growth for all theses compared. The number of ramifications differentiated from each plant was not influenced by the treatments in the spring-summer period, subsequently, as a result of pruning to 3 buds, are slight differences in favor of the plants are recorded in which the fertilizer was incorporated to the substrate. More significant were the differences related to the interaction of the factors examined, in favor of the thesis that involved the use of controlled-release fertilizer, incorporated before planting. Flowering began simultaneously in all plants. The inflorescences have differentiated a greater number of flowers in July and in August, probably because of the high temperatures, the production has been reduced; also in this case we have not been registered of statistically significant differences on simple due to the different treatments effects. The research has highlighted the possibility of adopting, for this species, fertilizers to slow apportandoli effect in the process of preparation of the substrate or even later in coverage.
|Number of pages||2|
|Publication status||Published - 2010|