De grootste kennisbank van het HBO

Inspiratie op jouw vakgebied

Vrij toegankelijk

Terug naar zoekresultatenDeel deze publicatie

Determination of coffee crops water requirements located in the Araguari River basin in Brazil

Rechten: Alle rechten voorbehouden

Determination of coffee crops water requirements located in the Araguari River basin in Brazil

Rechten: Alle rechten voorbehouden

Samenvatting

One of the most common technologies adopted by farmers, especially the ones who grow their
crop in the savanna, is irrigation. However there is no consensus about the management of this
irrigation, especially in relation to water volume and irrigation frequency. This leads to an
overconsumption of the resource. This study has allowed an estimation of the coffee crops water
requirements over time in the Araguari River watershed, and the part of this water requirement
that has to be provided by irrigation.
For a better accuracy, the whole watershed of the Araguari River was divided into three areas
(see figure 5). To evaluate the water requirement of the coffee crops within each area, daily
potential evapotranspiration rates have been computed from January 1st 2012 until December 31st
2013. For this, weather data and FAO Penman-Monteith method have been used to calculate the
reference evapotranspiration of the crops and, combined with the crop coefficients, the annual
optimal water requirements have been deducted. Then, to evaluate the water amounts to provide
with irrigation in the coffee crops of each area, the Thornthwaite and Mather method has been
applied to assess the water deficiency, based on the soil water balance throughout the year.
Lysimeters have also been used in this purpose to allow direct experimental measurements, but
the results were unusable.
Taking the average of 2012 and 2013, the calculated optimal water requirement for coffee crops
gave annual results of 1370, 1110 and 1210 millimeters, respectively for the areas 1, 2 and 3. A
part is provided by rainfalls but it has been estimated that the annual water deficiency was of 230,
64 and 167 mm respectively for the areas 1,2 and 3. Results from one year to another gave
comparable values and water deficiencies were identified in June, July, August and September in
the areas 1 and 3, corresponding to the southern dry winter, and in July, August and September in
the area 2, where the temperatures are a little bit lower and the rainfall amounts higher in
comparison to the two other areas.
To conclude, the water deficiency values previously mentioned give the annual amount of water
to provide by irrigation. It has been seen that this irrigation is necessary during the southern
winter, between June and September for the areas 1 and 3 and between July and September for
the area 2. Thereby, an average annual amount of 230, 64 and 167 millimeters in the areas 1, 2
and 3 respectively has to be distributed during these months of water deficiency. The rest of the
year, irrigation is not necessary since rainfalls provide enough water to the coffee crops. Also, the
study has shown the importance of using an irrigation system with the highest efficiency possible
because in term of water losses, the differences between two systems can be huge at the basin
scale. The drip irrigation presented the best results.

Toon meer
OrganisatieAvans Hogeschool
OpleidingEnvironmental Science for Sustainable Energy and Technology-Breda
AfdelingATGM Academie voor de technologie van Gezondheid en Milieu
PartnersInstitute of Agrarian Sciences - Federal University of Uberlândia, Brazil
Datum2014-08-17
TypeBachelor
TaalEngels

Op de HBO Kennisbank vind je publicaties van 26 hogescholen

De grootste kennisbank van het HBO

Inspiratie op jouw vakgebied

Vrij toegankelijk