Jack's Nutrients 15-0-0 Calcium Nitrate Part B Fertilizer | 2.2lb

Part B of the Jack's 3-2-1 Hydroponic Feeding System, 15-0-0, 2.2lb

A hydroponic reservoir can precipitate out its own nutrients if a multi-part system is mixed in the wrong order. Jack's Nutrients 15-0-0 Calcium Nitrate Part B promotes calcium uptake and strong leaf growth, and JR Peters specifically designs it to be mixed last in the Jack's 3-2-1 feeding sequence.

2.2lb size, 15-0-0 Part B, mixed last in the 3-2-1 system.

Key Features & Benefits

• 15-0-0 pure calcium and nitrate nitrogen combination — promotes calcium uptake and strong leaf growth.
• Part B of the Jack's 3-2-1 system, mixed last — manufacturer guidance: mixed after Part A and Epsom Salt to avoid precipitation.
• Flexible dosing by crop or growth stage — growers can adjust levels according to different crops or stages of growth.
• Combines with Part A FeED for a totally available nutrient solution — designed as a matched pair rather than a standalone formula.

Who Should Use This Calcium Nitrate Part B Formula

This fits growers running JR Peters' Jack's 3-2-1 hydroponic feeding system, or anyone who wants a pure calcium and nitrate nitrogen source they can dose flexibly by crop or growth stage.

About Part B in the Jack's 3-2-1 Program

Part B Calcium Nitrate is the third and final component mixed in JR Peters' Jack's 3-2-1 hydroponic system, following Part A and Epsom Salt, and combines with Part A FeED to form a totally available nutrient solution.

Frequently Asked Questions

How does this product fit into the Jack's 3-2-1 sequence?

This is Part B, mixed last in JR Peters' 3-2-1 hydroponic feeding system, after Part A and the Magnesium Sulfate (Epsom Salt) component. JR Peters' own mixing guidance calls for that specific order — Part A first, then Epsom Salts, then Part B last — to avoid precipitation in the reservoir.

What does the 15-0-0 ratio provide on its own?

It's a pure combination of calcium and nitrate nitrogen, promoting calcium uptake and strong leaf growth, and gives growers flexibility to boost calcium and nitrogen levels independently of the rest of a feeding program. That flexibility depends on different crops or stages of growth needing different calcium levels.

Does this need to be used with Part A?

Used in combination with Jack's Part A FeED, these two products combine to make a totally available nutrient solution, so pairing them is how JR Peters designed the system to work. Using Part B alone would leave out the phosphorus, potassium, and micronutrients Part A supplies.

What size is this listing?

This is the 2.2lb size option. Both sizes share the same 15-0-0 Calcium Nitrate Part B formula, so the choice comes down to how much product a grower needs on hand.