Using a Two-Part A&B Cannabis Nutrient System: Alternate or Simultaneous Feedings?

In our post How To Use Cannabis Fertilizers With A 2-Part A&B System we discussed cannabis nutrients incompatibilities, the problems they can create and the need for a 2 tank system. In this post, we will describe how you have flexibility in the way you feed these two tanks with Plant-Prod MJ Cannabis Fertilizers.

In our cannabis production guide below, you will notice that there are sometimes 2 formulations listed in a single week. This means that nutrients from both formulations are required that week. It also means that since Plant-Prod MJ Cal Kick is formulated with a complete cannabis micronutrient package you have the flexibility to feed one of two ways – alternate feeding or simultaneous feeding.
Plant-Prod MJ cannabis fertilizer program schedule by week

Alternate Cannabis Fertilizer Feedings

This method of feeding cannabis nutrients is ideal for when tank space is limited or when an injector system is not present. It involves the alternation of formulations between feedings. Each feeding consists of one formulation at a full rate. Formulations are switched every 2nd or 3rd feeding. For instance, Week 5 would look like this:
Plant-Prod MJ cannabis fertilizer alternate feeding example

Plant-Prod MJ Cal Kick cannabis fertilizer that has a unique formulation that allows for this feeding without the risk of micronutrient deficiencies. Programs that rely on calcium nitrate in Tank A do not have this option as the plants will be missing essential nutrients.

Simultaneous Cannabis Fertilizer Feedings

This method of feeding nutrients is ideal when tank space is no issue or when an injector system is available for use. It involves a little more rate calculation and fine tuning but will provide a consistent feed of all required nutrients. Each feeding consists of 2 formulations being injected into one line, each at partial rates to form a full rate. For instance, Week 5 would look like this:
Plant-Prod MJ cannabis fertilizer simultaneous feeding chart example

In both cases, rates will be dependent on what nutrients are already present in the water source. Visit our previous post on Reading Your Rates to learn how to adjust rates based on ppm values. Or contact your local Plant-Prod MJ cannabis fertilizer sales representative for a water analysis.

Growers planning a cannabis fertilizer schedule

Plant-Prod MJ cannabis fertilizers are made from the best raw materials in the world, blended and milled and 100% water soluble. That means more efficient, faster, consistent nutrient delivery for bigger, denser buds and faster growth on a more consistent basis.

For more cannabis fertilizer tips, check out these: 

Want to learn about improving your cannabis plant productivity? Download our Cannabis Fertilizer Growers Handbook and learn how to get 5X more buds with 80% less fertilizer.


Plant-Prod is a manufacturer of water-soluble cannabis fertilizers. The choice of growers from California to Maine for over 70 years, we formulate everything from chelated iron, to calcium nitrate and zinc fertilizer in order to help you get bigger buds for your buck. Click here to find a Plant-Prod cannabis fertilizer supplier near you.

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