poster - International Conference of Agricultural Engineering

Queiroz et al. (2004) and (Fonseca et al. 2005) also obtained an increase in the sum of
bases respectively applying swine wastewater and treated sewage effluent thus
demonstrating that the bases are applied through the wastewater can supplement water
demand of culture. However the balance of calcium magnesium and potassium may be
compromised.
The concentration of organic matter in soil extracts studied, differ from that of Malavolta
et al. (2002) who observed a tendency of concentration of organic matter in swine
wastewater decreases with the depth of the soil. This is due grained organic matter present
in the AR is lower than that of swine wastewater. It should also be the efficiency of the
system of treatment of these wastewaters.
Figure 3 - Alteration in organic matter content in soil layers 0-20 and 20-40 cm depth
In Figures 4.5 and 6 shows that the Ear were higher than the control which demonstrates
the importance of WW for the purpose of fertirrigation of Brachiaria brizantha cv. MG-5. The
values of the Ear nitrogen show that the presence of WW did not affect the transformation
process of the nitrogen molecules in the soil a fact pointed out by Reis et. al. (2005).
However, these do not coincides with the addition of MS accumulated by the plant during the
experiment, which was linear and growing as shown in Figure 1, but correlated with the
production factor H, maximized with 215 mm while the Ear nitrogen was maximized with the
depth of 213 mm
The Ear potassium, adjusted with a linear regression equation due to the applied layer of
WW, showing that the potassium level of RA were not sufficient to limit the Ear this nutrient
by the crops..
The Ear phosphorus showed lower values compared to the N and K, that fits as a second
order equation with minimum point when it receives the estimated treatment of 238.3 mm
and has Ear 9.3%.