SISTEMAS DE CULTIVOS NO DESENVOLVIMENTO RADICULAR DA SOJA

Abstract

One of the characteristics most important in the development of
a culture is the study of the system to root, that ally the different forms of
handling of the ground, will be able to reflect aspects important of its
performance. That an experiment with different system of culture in the
soybean was carried through. The treatments had been: conventional system
(SC), direct sowing during 5 years (DS5) and direct sowing during 10 years
(DS10). Opened 2 trenches for each system and collected the samples of the
soil the culture in full flowering. Each trench had 100 cm of length in the
line, enclosing of 10 and 12 plants, with 80 cm of width until reaching to
another line of plantation, consequently eliminating plantation line, with
purpose to inside facilitate to the work of the trench and depth of 60 cm. The
roots had been evaluated by the System Integrated for Analysis of Root de
Overture of the Soil. To the long one of the profile of the ground 10 cm and
evaluated had been collected samples to each: text of water, density of the
ground and porosity. The results had allowed to conclude that in the
conventional system the roots, in its majority, had been superficial and that
in the system direct plantation, independent of the time, did not have
differences in the distribution of the roots to the long one of the profile of
the ground. The density of the ground in the superficial layer was lesser in
the conventional system. The conventional system presented the biggest
macroporosity and small microporosity, being that in the direct independent
plantation of the time of this practical it had greater microporosity and lesser
values of macroporosity.