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A hydroponic system was considered to be an appropriate method for root investigations, particularly if the method can be established as a screening technique to classify differences in root traits among sugarcane lines. The aim of the research was to classify root and shoot characters of sugarcane lines grown under hydroponic conditions and to investigate their correlation with the field measurements. Hydroponic and field tests used a randomized complete block design (RCBD). Eight elite sugarcane lines were assigned as treatments. Shoot and root traits were measured at 3 months after transplanting in the hydroponic experiment, and field trial measured root length density (RLD) at 4 months after planting. Root and shoot traits under the hydroponic system showed significant differences among sugarcane lines. KK3 had a high root surface area, root volume, root length and root dry weight and TBy27-1385 demonstrated a high stem height and stem dry mass. Moreover, root dry weight, root volume and root surface area positively correlated with shoot dry mass. Positive correlation was exhibited between root traits such as dry weight of root and root length derived from hydroponic studies and RLD derived from field conditions.

The soil of the mangroves influences the root anchorage and the nutrition processes of the plant community. This study evaluated the relationships among edaphic conditions, volume and biomass of roots, and tree structure of two mangroves in Paraná State. Five soil cores of 50 cm depth were collected from each mangrove for physicochemical analysis. Organosoil thiomorphic salic sodic predominated in Antonina Bay, while in Guaratuba Bay were observed the Gleysoil thiomorphic salic sodic and the Organosoil thiomorphic salic sodic. Fifteen root samples were collected from each mangrove area for root volume and dry mass analysis'?'. The higher values of root mass were found in Guaratuba Bay. The chemical analysis of the soil showed no correlation between biomass and root volume. The high coefficients of variation attested the high heterogeneity in the root distribution in both areas. However, in the Guaratuba Bay, root mass and volume are higher due to the textural composition of the soil and higher tree density. RESUMO O solo do manguezal influencia a fixação e o processo nutricional da comunidade das plantas. Este estudo avaliou as relações entre as condições edáficas, volume e biomassa radicular e a estrutura de dois manguezais no estado do Paraná. Foram coletadas quinze amostras de solo até a profundidade de 50 cm em cada um dos manguezais. Na Baía de Antonina predominou o Organosolo Tiomórfico sálico sódico, enquanto na Baía de Guaratuba foram encontrados Gleisolo Tiomórfico sálico sódico e Organosolo Tiomórfico sálico sódico. Foram coletadas quinze amostras de raízes para determinar o volume e massa seca, em cada manguezal. Valores mais altos de biomassa radicular foram encontrados na Baía de Guaratuba. A análise química do solo não apresentou correlação com a biomassa e o volume radicular. Os altos coeficientes de variação atestam a elevada heterogeneidade na distribuição das raízes em ambas as áreas. No entanto, na Baía de Guaratuba foi constatada uma biomassa e volume maior de raízes devido a composição textural do solo e a maior densidade arbórea nesta área.