Proportional Injection

Reliable and low-cost, Dosatron injectors are simple to operate and rely only on your water system’s pressure to provide accurate injection of your pre-mixed fertilizer solutions.

Proportional Injection Nutrient Management at Zwart Systems | Greenhouse Irrigation & Automation Specialists, Beamsville, Ontario

Proportional Injection

Many growers want to be able to fertilize just a bench or an area or perhaps use a fungicide on only one crop. This can be difficult if your injection system uses a common mainline to supply all areas. Some growers have mounted proportional injectors on hand-carts with a pail for supply or used a wagon but if you ever pulled on a hose and watched your cart tip over and your injector crack as it hits the ground, you would know why we developed a Dosatron Cart that will last a lifetime.

Dosatron carts are for fertigation on the go. From single units to comprehensive systems, Dosatron has been the proportional injector of choice for Zwart systems for over 25 years. Discover the difference Dosatron can make in your greenhouse, garden center, or nursery.

From the Ground Up

At Zwart Systems, we offer complete design, manufacturing, installation, and service of all our products. We can help create a system that's right for you.

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Proportional Injection Overview


  • Parallel System

    Zwart Systems Scrolling Dosatron integrates a small PLC and flow meter to allow the Dosatron to activate or deactivate as water volume flow rates change over the irrigation day. As an example, this system can be designed using four (4) 40gpm Dosatrons plumbed in parallel and scrolled to open, adjusting to flowrate evenly from a minimal rate of 10 gpm up to a max flow rate of 160 gpm. This system evens out fertilizer delivery throughout the irrigation period.

  • Series System

    Pre-plumbed units incorporate Dosatrons plumbed in series for A/B applications.

  • Dosatron Cart Systems

    Dosatron cart systems are designed to make proportional fertilizing and fungicide applications portable. Made with a stainless-steel frame and your choice of pneumatic or solid tires and with a low center of gravity, these carts are rugged and reliable. We offer your choice of 14GPM, 20GPM or 40GPM injectors, with either a single 20Gal tank or 2 x 12Gal tanks for solutions. Each cart comes with a filter to protect your Dosatron, hose connections that are either threaded or quick-coupling and a 10’ supply hose. A watering wand storage tube is also added for your convenience.

  • Options

    Options on proportional injection systems include an all-in-one combined system designed to include freshwater pumps on one frame; EC/pH monitoring via a BlueLabs monitoring kit can be added for a quick view of water/fertilizer mix, or a sensor loop can be added that is compatible with your environmental control computer to log and alarm through your farm's environmental control computer.

Features, Specifications & Options

  • Features
    • Portable or stationary systems
    • Durable, rugged construction
    • Portable Dosatron carts have a sturdy no-tip design
    • Corrosion-resistant materials
  • Proportional Injection Specs
    • 14, 20, 40 and 100 GPM
    • Dosatron injectors
    • Tank selection
    • Pre-assembled for easy install
  • System Options
    • Fiberglass stock tanks, various sizes available
    • EC and pH BlueLabs monitoring
    • Computer in-line monitor
    • Zwart Systems can install on-site

Proportional Injection Nutrient Management at Zwart Systems | Greenhouse Irrigation & Automation Specialists, Beamsville, Ontario


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