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Highlighting agricultural developments, problems, research, & issues for central coast CA
by Bill
on August 24, 2022 at 11:41 PM
Good information! There are a lot of advantages for feritigation. Most importantly, it gives us the ability to apply nutrients at critical periods of crop demand without having to traverse the field thereby reducing compaction and crop damage, saving time and labor, and reducing fuel and equipment costs.  
For a hign efficiency we are also considering using fertilizer doser which is driven by water, such like this pattern,  
Do you think it is the good solution? Also, compared to mixing range 1-10%, 0.4-4% doser is ideal?  
Any suggestions will be highly appricated! Thanks a lot!
Reply by Michael D Cahn
on November 11, 2022 at 9:43 AM
Hi Bill,  
I have had good luck with the water driven injectors such as the one that you pointed out. The main issue is that they must be sized for the flow rate of the irrigation system and field size so that they operate correctly and so that you can inject all the fertilizer into the irrigation line before the irrigation ends (leaving sufficient time for all the fertilizer to flush out). In larger irrigation systems, the water driven injector needs to be installed like an venturi injector, where a portion of the water is bypassed through a separate smaller line via partially shutting a valve in the mainline. The dosing proportion will depend on how long one irrigates and how much fertilizer one wants to inject. For short to medium irrigations, a 1-10% dilution would be recommended. the 0.4 -4% dilution would be better for situations where you always want some fertilizer in the water when the system is operating.
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