Name: DANIEL ALVES MUNDIM
Publication date: 31/05/2016
Advisor:
Name |
Role |
|---|---|
| ROBSON BONOMO | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| FÁBIO LUIZ PARTELLI | Internal Alternate * |
| FÁBIO RIBEIRO PIRES | Internal Examiner * |
| ROBSON BONOMO | Advisor * |
Summary: The use of vinasse in fertigation is common practice to industries producing sugar and alcohol
and its proper distribution in the soil is responsible for improvements in the physical and
chemical attributes of this natural resource, but the disorderly application can negatively
influence and contribute to the impracticability of agricultural practices. Thus this study aimed
to identify and analyze the changes in a red yellow podzolic soil dystrophic located in Cordanta
J farm in the municipality of Conceição da Barra - ES WHERE the practice of using vinasse has
been going on for over 15 years, with the comparison to farm Cordanta P, area of sugarcane
without fertigation, farm Aliança with eucalyptus area and native forest.Treatments were
performed in a randomized design in a factorial 2 (Environment) x 4 (depth) with 04
repetitions WHERE disturbed soil samples were taken and undisturbed in the depths of 0-20,
20-40 40-60 and 60-80 (cm).Soil samples were sent CEUNES soil physics laboratory WHERE they
were evaluated water retention curve characteristics on the ground, density, hydraulic
conductivity. For Chemical analyzes deformed samples were sent to Fullin laboratory which
analyzed the concentrations of macro and micro nutrients, organic matter and pH were also
analyzed electrical conductivity (EC) and sodium absorption ratio (SAR). The results showed
that the soil with native plants had higher water retention capacity while fertigated area
showed lower capacity and also lower amount of water available (WA) and readily available
water (RAW), there was a significant reduction in hydraulic conductivity in the fertirrigated
environment in deeper layers indicating compression. The determination coefficient of
adjustment of the water retention curves in soil is greater than 99% and adjustment
parameters increased with depth. A significant increase in phosphorus-Mehlich nutrients (mg
dm-3
), potassium (mg dm-3
), sulfur (mg dm-3
), Zinc (mg dm-3
) and sodium (mg dm-3
) in
fertigated area, pH and organic matter showed no significant difference between the
environments. Sodium levels were significantly higher in the area of native forest, hence the
SAR and EC values were higher at this location. Overall, there was an improvement in soil
chemical properties in comparison to areas WHERE there was no application of vinasse.
Regarding to the physical soil characteristics, the significant reduction in hydraulic
conductivity (KFS) appears to be associated with the accumulation of salts of potassium (K)
that showed high content in this area and is also the main nutrient found in the composition
of vinasse.
