Name: FLÁVIA BARRETO PINTO
Publication date: 28/03/2016
Advisor:
Name |
Role |
|---|---|
| FÁBIO RIBEIRO PIRES | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| EDILSON ROMAIS SCHMILDT | Internal Examiner * |
| FÁBIO RIBEIRO PIRES | Advisor * |
| ROBSON BONOMO | Co advisor * |
Summary: Considering an increasing demand related to Brazil's agricultural production
becomes a need for greater and better understanding of how to keep it sustainable, it
is important to keep a good soil for future crops have a suitable environment and it
has good productivity. Studies about soil physical and chemical attributes allows a
good indication of the quality of a given soil. In this sense, it was evaluated in this
study changes in physical and chemical properties in areas with different uses within
a property located in the city of Jaguaré-ES. The areas studied were under the
homogeneous planting conilon coffee (Coffea canephora Pierre ex A. Froehner) (Cc);
rubber tree (Hevea brasiliensis L.) (S); consortium with rubber tree and conilon coffee
(SCc); consortium with rubber tree and coconut (Cocos nucifera L.) (SCo);
consortium with rubber tree, black pepper (Piper nigrum L.) and cocoa (Theobroma
cacao L.) (SPCa); and native vegetation (MN). The experiment was carried out by
sampling in five installments of 6 x 6 meters on each use system. The chemical
attributes were analyzed at 0-10, 10-20 e 20-40cm depths are: soil organic matter
(SOM), pH, P, Ca, Mg, Na, K, Al, H + Al, sum of bases (SB), effective CEC (t),
potencial CEC (T), base saturation (V) and Al saturation (m). The physical attributes
analyzed at 0-10, 10-20 e 20-40cm depths were: texture, particle density, soil
density, macro and microporosity and aggregate stability. At 15 and 30cm depths
were analyzed hydraulic conductivity and 0-10, 10-20, 20-30 e 30-40cm penetration
soil resistance. Data were subjected to variance analysis and treatment means were
compared by Tukey test at 5% probability. It used also Tocher grouping method
based on the Mahalanobis dispersion. MN had lower penetration soil resistance and
soil density and higher macroporosity compared to other areas, probably due to the
higher values of soil organic matter. The areas under Cc and agroforestry system
SPCa were similar when evaluated particle density, soil density, total porosity,
microporosity, microporosity and sand, clay and silt percentage. The covers Cc and
MN were similar when was considered the chemistry and analyzed depths. The
management adopted in Cc area performed better than adopted in agroforestry
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systems in the upper layers. It worked more effectively, improving the quality of soil
chemical properties. The agricultural use of the soil, even in the case of perennial
crops, caused changes in soil physical properties and degraded soil organic matter
when compared with original condition.
