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Fertigation Basics: Fertilizer Injectors & Mixers

By on June 02, 2011

Tricia pours liquid fertilizer in to the Add-It pint-size Fertilizer Injector

A labor-saving device that fertilizes plants automatically.

It sounds like a gardener’s dream come true, doesn’t it?

Say hello to fertilizer injectors and mixers—they will do your fertigation for you.

What’s fertigation?  Fertilizer + Irrigation = Fertigation. Whether you water by hand, use a sprinkler system, or a drip irrigation system, you can give fertilized water to your plants. Tricia walks you through the different devices for fertigation in our new video.

Which fertilizers?  In one of our videos Tricia explains how to choose and apply the best fertilizers for your plants. Water-soluble or liquid fertilizers are diluted and sprayed on leaves (foliar feeding) or watered into the soil.

Here’s how to choose the best fertilizer mixer or injector for the irrigation you use.

For gardeners who have low water pressure and water by hand

grow more siphon mixer injectorOur simplest device is our Grow More Siphon Mixer Injector. One end of this ingenious siphon mixer screws onto your hose bib, the other attaches to your garden hose. The mixer has a small siphon tube that drops down into a bucket of liquid fertilizer and takes the concentrate up into the hose line at a 1:16 ratio as you water. A backflow preventer is integrated into the mixer. Use this mixer with hoses 200’ or less in length. Must be used with an atmospheric Vacuum Breaker. If your house was built within the last 40 years, it will likely have a Vacuum Breaker in place.

For gardeners who have low water pressure and use sprinkler systems or drip irrigation

The Add-It Proportioning Fertilizer Injectors and the EZ-Flo System are the next step up. Each of them accommodates low water pressure and either drip irrigation or sprinkler systems.

add-it fertilizer injectorTricia uses this pint-size Add-It Fertilizer Injector in the videos. Easy to operate, the Add-It injects fertilizer at a 1:200 ratio (2 tablespoons per gallon). A minimum pressure of 10 PSI is required. A backflow device, like our Vacuum Breaker, must be installed before the injector, and a filter is recommended when injecting fertilizers into drip irrigation. Add-It does not need a by-pass because running water through the empty unit will not harm it.

ez-flo automatic fertilization systemYou can attach the EZ-FLO Automatic Fertilization System to a hose, or install it as part of a sprinkler system or drip system. The EZ-FLO is an economical and flexible system for automatic fertilizing. Unlike similar systems, you can see the amount of fertilizer solution as it is used. Made of commercial grade components, the EZ-FLO is appropriate for residential or commercial growers and landscapers.

For serious home and commercial growers

When you want to be able to easily calibrate the amount of fertilizer that goes on your plants, the best choices are the professional-quality mixer-proportioners.

young mixer proportioner The 2-gallon Young Mixer-Proportioner is simple, virtually indestructible, and very accurate. It’s a good choice for home or market gardeners who do a lot of injecting or spraying (soluble fertilizers, foliar feeds, soil inoculants or pest controls). The tank comes lined with a replaceable bladder-type bag that lasts several years. To operate, just fill the tank with concentrate, dial in the desired ratio (select from 1:30 to 1:200), turn on the water and that’s it! Minimum water flow rate is 2 GPM. Look through the clear plastic outlet to see if the concentrate is finished.

mazzei injectorA popular, long-lasting choice is the Venturi-type Mazzei Injector. The Mazzei connects at each end to the irrigation line, and a downward-facing arm is the conduit for the liquid fertilizer. High water pressure in the irrigation line creates a vacuum that pulls the liquid fertilizer in to the water stream. Check our different Mazzei injectors to coordinate with your gallons per minute. These low-cost, accurate injectors are capable of higher flow rates than the other injectors we carry. They require a bit more installation expertise, but the cost savings can be worth it.


Are you heading toward one of these fertigation options? Get more information one of three ways: at our website, from the experienced gardeners at our call center (888-784-1722), or come in and talk with the knowledgeable staff in our Grass Valley store.

If you’re thinking about adding drip irrigation, check out our blog post and video that show you a range of systems.

Need a review on fertilizers? We have a blog post and video on that too.

Get some fertilizer mixers and injectors. They’ll be your able garden assistants, ready to mix and deliver fertilizer when you water.

  Comments (4)


I enjoyed the informative blog and video on “Fertigation”, however I wonder about mixing my water soluble or powder with water then letting the equipment meter it out. How much water would you use? I can measure two tsp. and mix it with a gal. of water, but how dilute is my concentrate once I mix it with water? I trust there are instructions for the various types of powder and soluble out there for each of the different mixer units, not just the one Trish referred to in the video. I could always check the “PPM” of the final mix coming out of my particular delivery system, with my electronic fertilizer tester as well just to verify the accuracy.

Posted by Dan Mominee on Jun. 29, 2012 at 7:27:26 PM


I am looking for a fertilizer injector system to use with worm tea. I need to inject in 1:4-1:10 ratios. Do you have any suggestions?

Posted by Rob on Aug. 20, 2013 at 7:18:42 AM

Rob, We don’t have injectors at exactly those proportions. What we can offer you are the Young Mixer-Proportioner that starts at 1:30 as the most concentrated ratio The Grow More Siphon Injector has a fixed ration of 1:16

Posted by on Sep. 18, 2013 at 3:52:57 PM


Hello from Northcentral PA!

We are a small, but growing Certified Naturally Grown (CNG) hops farm. At present for our current, smaller yard we drip irrigate via a 250 gallon tank. I’ve been wanting to try fertigation for some time but not sure where to start with our system.

We will be harvesting our hops soon, but it is recommended we keep watering and fertilizing after harvest to prep the roots for overwintering.



Posted by Joshua on Aug. 25, 2015 at 5:20:44 AM

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