Matéria seca e altura das plantas de soja e arroz em fun??o do grau de compacta??o e do teor de água de dois latossolos

摘要

This research was carried out to evaluate the height of plants and production of aerial and root dry matter of soybean and rice in two water contents (water content at tension 0.05 and 0.01 MPa) and three levels of resistance to penetration (between 0.25 and 6.46 MPa) determined with penetrometer dinamometric ring. Samples of Haplustox and Eutrustox, medium and clayey texture were collected in depth of 0.0-0.20 m and compact in layers of 0.03 m in pots of 0.20 m of height and 0.25 m of diameter. The height of plants was reduced in values of penetration resistance greater of 3.0 MPa. The smaller production of aerial part dry matter of the plants occurred in penetration resistance of 3.76 and 3.37 MPa for soybean; 3.93 and 3.37 MPa for rice, in Haplustox and Eutrustox, respectively, in the water content in tension of 0.05 MPa, and in the greater water content only occurred reduction of root dry matter.