Influence of liming and boron on development of young Swietenia macrophylla plants grown in Yellow Oxisol.

The aim of this study was to evaluate the development of young Swietenia macrophylla plants grown in Yellow Oxisol submitted to different liming and boron doses. Experimental design was completely randomized in factorial arrangement (|4x4|+1), with additional treatment (control), being 4 liming levels (0.5, 1.0, 1.5 and 2.0 t ha-1) combined with 4 boron levels (1, 2, 3 and 4 mg kg-1 of substrate). Parameters evaluated were plant height, stem diameter, stem dry matter, aerial part dry matter, root dry matter and aerial part dry matter/root dry matter ratio. The height of young Swietenia macrophylla plants was not influenced by liming and boron levels. Maximum yields of leaves and aerial part were obtained with doses of 1.57 and 1.44 t ha-1 of liming, respectively. The increase of boron levels negatively influenced the production of root dry matter. For the diameter and dry matter of stem and root significant interaction between liming and boron levels were observed. The better results linked to development of young Swietenia macrophylla plants were found at a dose of 1.5 t ha-1 of liming and 1.0 mg kg-1 of boron

Bringing together Brazilian soil scientists to share soil data.

Brazilian soil scientists have recently created a soil data repository using community-built standards and following open data policies in an attempt to address the issues mentioned above. The Free Brazilian Repository for Open Soil Data - febr -, accessible through www.ufsm.br/febr, is a centralized repository targeted at storing open soil data and serving it in a standardized and harmonized format, for various applications. This paper describes the features of febr and the opportunities that it creates for soil science.Na publicação: Wenceslau Teixeira