In Lazio region, the widespread hazelnut monoculture could play a considerable role in mineral pollution. Currently, it is necessary to define sustainable nutritional management of hazelnut orchards in these areas. With the aim of limiting losses of mineral elements by production systems, an experiment was initiated based on the management of total foliar nutrition of hazelnut orchards. The trial was conducted in an adult orchard of hazelnut cultivated with 'Tonda Gentile Romana' and 'Nocchione'. Two randomized experimental theses were subjected to foliar nutrition conducted in several applications of macro and micronutrients during the growing season (thesis A, 4 treatments; thesis B, 3 treatments), in comparison with controls fertilized with the traditional technique of a single application in early spring. The measurements and observations focused on the vegetative traits of the trees, the leaf analysis at the beginning and the end of July, and the production and nut and kernel characteristics. The data collected during three years of investigation and the leaf analysis based on the determination of the content of nitrogen, phosphorus, potassium, calcium, magnesium, boron and iron, showed no significant differences between the compared theses, noting the appropriateness of total foliar nutrition in the period of the trial.

With the objective to evaluate the efficiency of essential oils of Citrus latifolia (Tahiti lemon) and Cinnamomum zeylanicum (cinnamon bark) in the control of plant pathogens Penicillium sp. and Aspergillus sp. and the quality of the bean seeds, two experiments were conducted. In the first one, the effect of essential oils of C. latifolia and C. zeylanicum was evaluated in vitro development of the fungi Penicillium sp. and Aspergillus sp. and, in the second one, the influence of essential oils on the physiological and sanitary quality of bean seeds. The variables mycelial growth, conidial germination and sporulation of Penicillium sp. and Aspergillus sp. were measured in the first experiment, while the seed germination test, first count of germination, germination speed index (GSI) and sanity test of bean seeds were measured in the second. The essential oil (EO) of C. zeylanicum was more efficient than C. latifolia in the control of Aspergillus sp. and Penicillium sp., but decreased the physiological quality of the beans seeds. The fungal diversity identified in the seed health test was composed by fungi of the genera Aspergillus, Penicillium, Cladosporium, Fusarium, Chaetomium and Rhizopus. The results indicate the potential of the use of these EOs in the seeds treatment.