Research was carried out in Giulvăz, Timiş County, in 2018-2020, in a plantation located on a preluvosol. The plantation was established in the autumn of 2017 and has a total area of 3.5 ha: 2 ha with apple, 1 ha with plum and 0.5 ha with a mixture of various species. As fertilizers, 30 t/ha manure was applied in the autumn of 2017, before the plantation was set up. Results show different contents of nitrogen, phosphorus and potassium, depending on the vegetation period of the trees: in April, the content is higher compared to September due to consumption of nutrients of the trees during vegetation, a normal consumption because, during this period, the trees need the application of fertilizers in order to be able to fructify. In this respect, research was carried out by the authors of this paper and by other researchers in the field, but concrete results in this respect can only be observed after a number of years since nitrogen, phosphorus and potassium content in the soil is changing continuously as a result of consumption by trees. In Romania, research in this such a complex area is quite limited because of both the rather high cost of organic fertilizers and of the general lack of financial resources necessary to continue research and present results. This paper is original, both in terms of the information it supplies to those interested in the fertility of soils cultivated with trees, as well as in terms of the practical solutions it provides in two important areas: soil science and fruit growing.

organic fertilizers, supply, soil, sustainable agriculture, fruit plantation

sciences soil

Presentation: poster