poster - International Conference of Agricultural Engineering

2 Material end methods
The wastewater (WW) was derived from the first environment of a system for wastewater
treatment industry cassava and applied with a hydraulic gun with a fixed, maintaining a range
of application of 30 meters for 10 weeks, 4 hours per week, totalling 40 hours of irrigation in
the period from 20 November 2008 to January 23, 2009.
It was used a point source with 6 treatments, 0, 100, 275, 296, 328 and 366 mm of WW
applied during the production cycle, respectively L1, L2, L3, L4, L5 and L6, spaced bands at
35, 5, 10, 15, 20, 25 and 30m away from the hydraulic gun. The samples analyzed for
nutritional grass and soil fertility, were performed in the same rays according to Oliveira
et al. (1991) and Embrapa (1997).
The experimental area was set equal to a cut grading on November 20, 2008. Quantifying
the production of dray matter (DM) was performed on /1/30/2009, using samples of the grass
cut 1.0 cm from the soil in an area of 0.16 m 2 .
The soil was characterized as Udult soil (Embrapa 1999) and during experiment were
recorded by station City Gaucha, Paraná, Brazil, 431,8 mm of rainfall and the temperature
were 30.0 and 21.0 o C respectively maximum and minimum .
The fertility of the soil was measured by the difference between the control and each
treatment of the bases sum (Sb) and the organic matter (OM) layers of soil from 0.20 and
0.40 m .depth.
To evaluate the extraction of soil nutrients by the grass was calculated efficiency of
absorption of nutrients which is the percentage of increase of nutrients in relation fo control
according to equation 1.
Ni Nt
Ear .100 (1)
Nt
Were:
Era: relative efficiency of nutrient absorption by the crops, %;
Ni: content in the leaves of grass, after harvest, gKg -1 ;
I, treatment, mm and
Nt: content in the leaves of the grass after harvest the control treatment, gKg -1
3 Results and discussion
The chemical composition of major plant nutrients was found in RA used in this study
collected the hydraulic gum at the time of application is presented in Table 1 which differs
from those shown by Fioretto (2003) and Silva (2005) demonstrating the diversity
of composition of this waste.
Table 1 Analysis of WW collected the nozzle of the hydraulic gun
N P K + Ca 2+ Mg 2+ C pH
mgL -1
168 13.3 91.8 21.35 13.23 3500 5.61
In the Figure 1 is observed that the height of the grass (H) presents a quadratic
relationship with the blades of WW, reaching a maximum height of 154 cm to 262 mm L,
using a regression equation of the second order to fit the data. However the production of dry
matter (DM) grass has been continued increasing in the range of L studied, 6.7
to 26.0 Mg ha -1 . Both the linear and quadratic equation and its terms are significant at
p≤ 0.01.