Obstruction of drippers as a result of application of moisturized whitewash in irrigation water

Engenharia Agrícola

Cícero R. A. Barboza Júnior²  João A. Lelis Neto²  Marcelo P. Hartwig¹  Allan C. Barros¹  Rubens D. Coelho² 

[1] ,USP ESALQ Departamento de Engenharia de BiossistemasPiracicaba SP

关键词: drip tube;    clogging evaluation;    hydrated lime;    tubo gotejadores;    evolução de entupimento;    hidróxido de cálcio;   

DOI  :  10.1590/S0100-69162011000500006

来源: SciELO

【 摘 要 】

Plug dynamics of non compensate drip tubes were evaluated, by the precipitation of moisturized whitewash [Ca(OH)2], which is used in the fertigation for the bulb pH control of the trademarks Azud, Amanco, Naandan, Netafim, Petroisa, Queen Gil, with flow rate varying between 0.4 to 3.0 L h-1 usually used in the country. For this matter, increasing doses of Ca(OH)² were applied in the irrigation water, from 0.01 g L-1 to 1.84 g L-1. The flow rate of each drip tube was measured in intervals of time initially of 7 days, later of 15 days of system operation, totaling a time of 100 days of operation, corresponding to nine applications or 432 hours. The coefficient of variation (CV), and relative rate flow (Qr) were evaluated. The results pointed differences among the evaluated emitter regarding the occurrence of the clogging, and the models G2 and G5 presented the smallest levels of flow rate variation comparing to the models G6, G7 and G9.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License