This is specially critical for drip systems that must be kept free from suspended solids and microorganisms that plug the small orifices in the emitters or driper. In the case of clogging of the drip system by bicarbonate precipitation the use of fertilizers with acid reaction partially corrects this problem. However, acid fertilizers cause corrosion of the metallic components of the irrigation system and damage the cement and asbest pipes. Therefore, the periodic injection of acid in the fertigation system is recommended in order to dissolve the precipitates and to unclog the drippers. The following acids can be used phosphoric, nitric, sulfuric and chlorhydric. In the West, HCl is widely used due to its low cost. Acid injection through the system will also remove bacteria, algae and slime. The irrigation and injection system should be carefully washed after the injection of acid.
In Asian countries like Malaysia however, this method is unknown. What is being done to solve this problem is manually unplug the driper from microtube and wash it in water. For us, we usually use toothbrush to clean the driper from sediments or unwanted items that clogg the driper. After it is thoroughly clean, then plug back the driper to the microtube. This old method is not practical in a huge fertigation plantation and add costs in terms of labour. So, the best way is still the injection of acid substance in the fertigation system.
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