Modelagem e geoprocessamento aplicado ao planejamento de sistemas agrícolas conservacionistas: desenvolvimento de método e ferramenta computacional
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2016-07-11
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Universidade Federal de Goiás
Resumo
The deficiency in the management of agricultural areas causes problems of economic
and environmental order. Many times the terraces dimensioning methods have results with reduced
horizontal spacing, discouraged their adoption and causing erosion problems, and consequently
loss of soil, water and nutrients. The soil loss calculation models can be used for the design of
these structures, considering the displacement of soil lower than its natural formation rate,
controlling the erosive process. However, the use of these models is hampered by the lack of data
bases and tools that simplify their use. Concomitantly conservation planning can be integrated into
agronomic management, enabling the optimization of the use of agricultural land and of the
equipments, conciliating the economic and environmental aspects. In this sense the present study
aimed to evaluate the cartographic quality of altimetric surveys carried with GNSS RTK receiver
onboard in quadricycle; develop a terrace in level spacing calculation method, using the soil loss
calculated by USLE; a model of dimensioning agricultural systems, involving the use of terraces as
rural roads, plots division, and generation and planting lines; analyze the accumulation of runoff on
sugar cane lines for different furrow depths and the spatial variability of relief; and finally, develop
a computational tool using the method and model. The altimetric data collected with quadricycle
met the Class A pattern of cartographic accuracy, for the preparation of cartographic products with
vertical equidistance of 0.30m. The terrace spacing calculation method reduced by up to 83.0% the
total length of terraces; the agricultural systems dimensioning model enabled a reduction of up to
51.6% in the number of operations as well as increasing the average length of the lines and
reducing the area for the use of rural roads, which increases the efficiency in the machinery use
and in the use of agricultural area. The evaluation of the runoff volume accumulation in the
planting lines due to the furrow depth found large storage capacity, reaching values of up to 158.1
m³ ha -1 , averaging 95.8 m³ ha -1 to furrows with 0.3m depth, resulting in a reduction of up to
10.1centimeters at the height of the terraces. The developed computational tool proved to be easy
to use, and successfully completed the design of the plots, planting rows and terraces.
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RABELO, M. W. O. Modelagem e geoprocessamento aplicado ao planejamento de sistemas agrícolas conservacionistas: desenvolvimento de método e ferramenta computacional. 2016. 179 f. Tese (Doutorado em Agronomia) - Universidade Federal de Goiás,Goiânia, 2016.