Distribuição espacial do sistema radicular da popunheira irrigada por gotejamento e microasperção.

Abstract

ABSTRACT: To compare spatial distribution of pupunha palm tree root systems, between two irrigation systems, micro-sprinkler and drip, a work was conducted on Cidade Gaúcha town, Paraná state, Brazil. Palm tree seedlings were placed at a sand soil experimental field, at january of 2002. Root systems measures started on september, 2003. Spatial distribution of root systems was evaluated on field, computing depth and horizontal dimension of systems to some plants. Also, o soil monolith was obtained to each plant and the root system was collected by completely removing the soil. Mean of total dry mass of roots was 1,98kg to plants irrigated by drip system and 1,53Kg to micro-sprinkler system. On the drip irrigation treatment, root system distribution was: 58,0% at 0 to 0,20m depth, 29,8% at 0,20 to 0,40m depth and 12,1% at 0,40 to 0,60m depth. On the micro-sprinkler irrigation treatment, root system distribution was: 41,0% at 0 to 0,20m depth, 36,0% at 0,20 to 0,40m depth and 23,0% at 0,40 to 0,60m depth. Then, plants irrigated by drip systems, showed more shallow root systems, but wich higher total dry mass. Also, on the drip-irrigated treatment, root systems showed higher diameters.