Compost teas are organic solutions obtained by the fermentation of compost in a liquid phase for a few days, with or without aeration. The use of these teas in agriculture is emerging for supplementing or substituting fertilizers and for their ability to suppress soil-borne pathogens. In this study physical and chemical characterization of garden waste compost tea, its application effects on potato growth and its suppressive effect against Rhizoctonia solani were analyzed. N and K content were relevant (3200 and 3848 ppm, respectively). Humic acid level was 190 mg L -1 . Field trials were carried out with three fried industrial cultivars (Agria, Hermes and Lady Amarilla) in soils affected by Rhizoctonia located in Rasueros municipality (Avila, Spain) during 2017. Different dosages of compost tea (d1:1l and d2:3l per plot-7.5m 2 ) were applied in experimental potato crops, in order to evaluate growth and production parameters (plant height, SPA units, shoots number, yield, tuber size and fried quality) and the Rhizoctonia solani control (attack severity). The application of the dosage 1 (1333,3 l ha -1 ), with respect to control, increased the yield (9,47%), improved the culinary quality (40 %) and reduced the Rhizoctonia incidence (12,4-23,7%). These results show that the use of garden waste compost tea can be of great interest to organic and sustainable agriculture.

Conservation and utilization strategies require fundamental knowledge about levels of genetic diversity, population genetic structure and effective population size, because they are the key elements that determine a species ability to respond to selection, either natural and artificial procedures. Sweet chestnut (Castanea sativa Mill.), widely distributed around Europe, is a multipurpose tree species of great economic importance for fruit and timber. Moreover, chestnut contributes to carbon storage, the landscape structure and the biodiversity conservation, that are relevant factors for environment management especially under climate change. Although there is information about chestnut traditional varieties, up to now, there is not complete information on the genetic diversity of natural populations in Spain. In this study, patterns of genetic variation and structure are assessed within and among natural populations of chestnut in Spain. 17 natural populations were evaluated using 7 microsatellite markers and Alleles in Space (AIS) software. This study allowed to describe the level and distribution of the genetic variability in Spanish chestnut populations, showing a high genetic diversity. Moreover, populations displayed a structure that followed a geographical pattern, indicating in a first approach, a separation between populations from West and east of the Iberian Peninsula.