Abstract
The study aimed to evaluate the performance of drip irrigation systems with clean water application and cassava wastewater processing, by determining the distribution uniformity coefficient (CUD) and the process capability index (Cpl). The research was carried out in an agroindustrial area from western Parana State, Brazil, where two irrigation systems were set and operated in different periods. After the essays implementation, the two irrigation systems were identified and stored in order to be retested after one year (2nd year of collection). So, the same conditions that were established in the first year had still been considered. Treatments with effluent showed flow averages near to those ones obtained with the use of clean water. Only in the T4 treatment, CUD was classified as good, while the others were excellent. The process was rated as efficient only in T1 with 80% LCL, with a 2.04 Cpl. Thus, based on this technique, it was possible to check that the system is able to keep suitable levels of uniformity. Key words: Distribution uniformity, process capability, water quality.
Highlights
Due to water scarcity in many parts of the world, drip irrigation is becoming a popular system (Sahin et al., 2005), for its lower water consumption compared to other systems
Treatments that applied effluent showed flow averages very close to those ones obtained with clean water application
There were no significant changes in the flows of systems when clean water was applied or with cassava wastewater processing
Summary
Due to water scarcity in many parts of the world, drip irrigation is becoming a popular system (Sahin et al., 2005), for its lower water consumption compared to other systems. The most important of them concerns recovering a resource of great importance to agriculture: water; besides, its use works as an extra source of nutrients for plants. It helps on reducing development costs and with the addition of nutrients such as nitrogen, phosphorus and potassium from chemical fertilizers (Wang and Huang, 2008; Sandri et al, 2009; Juchen et al, 2013).
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