Jack's Nutrients Part A (0-12-26) 25 lb

Jack's Nutrients Part A (0-12-26) 25 lb is a professional-grade, fully water-soluble powdered fertilizer that provides a concentrated source of phosphorus and potassium without additional nitrogen.

Designed as part of Jack’s two-part nutrient system, the 0-12-26 Part A formula works alongside Jack’s Nutrients 15-0-0 Cal Nit Part B to give growers greater control over nitrogen, calcium, phosphorus, potassium, secondary nutrients, and micronutrients.

The zero-nitrogen formulation is particularly useful when growers want to maintain phosphorus and potassium availability while controlling nitrogen separately. Its highly soluble powdered format makes it suitable for hydroponic systems, fertigation, controlled-environment agriculture, commercial greenhouses, and professional indoor cultivation.

Key Benefits

• Professional 0-12-26 N-P-K fertilizer.
• Zero nitrogen in Part A.
• Provides a proven balance of phosphorus and potassium.
• Designed for use with Jack’s 15-0-0 Cal Nit Part B.
• Fully water-soluble powdered formula.
• Provides secondary nutrients and micronutrients at each feeding.
• Allows nitrogen and calcium to be managed separately.
• Suitable for hydroponics and fertigation systems.
• Excellent solubility for stock tanks and nutrient reservoirs.
• Manufactured from high-grade technical fertilizer materials.
• Suitable for controlled-environment and commercial production.
• Large 25 lb (11.34 kg) format.

0-12-26 Nutrient Analysis

The guaranteed N-P-K analysis is:

• Nitrogen (N): 0%
• Available Phosphate (P₂O₅): 12%
• Soluble Potash (K₂O): 26%

The absence of nitrogen allows growers to adjust nitrogen independently through the accompanying Part B component.

Designed as Part A of a Two-Part System

Jack’s Nutrients 0-12-26 is intended to function as Part A of a multi-component feeding program.

It is typically paired with:

• Jack’s Nutrients 15-0-0 Cal Nit Part B
• Magnesium sulfate when required by the selected Jack’s feeding schedule

Separating Part A from calcium nitrate helps maintain nutrient availability and gives growers greater flexibility when adjusting the nutrient profile.

Ideal for Managing Nitrogen During Flowering

Because the formula contains 0% nitrogen, growers can continue supplying phosphorus, potassium, secondary nutrients, and micronutrients while controlling how much nitrogen is added through Part B.

This makes 0-12-26 particularly useful in feeding programs where nitrogen requirements change as plants progress through reproductive and later flowering stages.

Always follow the current Jack’s Nutrients feeding schedule for the crop, water source, substrate, and growth stage.

Fully Water-Soluble Powder

Jack’s 0-12-26 is formulated from highly soluble fertilizer materials.

The powdered concentrate dissolves readily into irrigation water, helping create a uniform nutrient solution for:

• Hydroponic reservoirs

• Drip irrigation

• Fertigation systems

• Coco and soilless substrates

• Commercial greenhouse production

• Controlled-environment agriculture

Proper mixing helps maintain consistent nutrient delivery throughout the irrigation system.

Suggested Jack’s 0-12-26 Late-Flower Rate

In Jack’s 321 + 0-12-26 feeding program, the published late-flower rate for Part A is approximately:

These values are based on Jack’s published 321 + 0-12-26 program.

Actual nutrient strength may need to be adjusted according to:

• Source-water mineral content
• EC of the starting water
• Crop type
• Plant stage
• Irrigation frequency
• Substrate
• Environmental conditions

Example Complete Late-Flower Combination

For reference, the Jack’s 321 + 0-12-26 late-flower program uses approximately:

These rates are starting points from the manufacturer’s feeding program and may require adjustment based on water quality and crop response.

Important Mixing Information

Do not combine concentrated Part A and calcium nitrate Part B together before dilution.

When preparing a nutrient solution:

1. Fill the reservoir with the required amount of water.
2. Add the required fertilizer component to the water.
3. Allow it to dissolve completely.
4. Add the remaining nutrient components separately, allowing each to dissolve before adding the next.
5. Mix thoroughly.
6. Measure the final EC and pH.
7. Adjust the finished nutrient solution as required for the crop and growing system.

Keeping the concentrated components separate helps prevent nutrient precipitation.

Ideal Applications

• Hydroponic systems
• Coco and soilless media
• Drip irrigation systems
• Fertigation
• Indoor cultivation
• Commercial greenhouses
• Controlled-environment agriculture
• Flowering and fruiting crops
• Professional nutrient management
• Stock-tank and injector systems

Product Specifications

How to Use Jack's Nutrients Part A 0-12-26

Determine the appropriate feeding rate using the current Jack’s Nutrients schedule for your crop and growth stage.

Measure the required quantity of 0-12-26 Part A accurately using a fertilizer scale.

Add it to the irrigation water and mix until completely dissolved.

Add the remaining components of the feeding program separately rather than combining concentrated fertilizers together.

After all nutrients are dissolved, check the final EC and pH and adjust as required.

Regularly monitor plant response, runoff or reservoir EC, and source-water conditions to fine-tune the feeding strength.

Frequently Asked Questions

What does 0-12-26 mean?
It represents the fertilizer’s N-P-K analysis: 0% nitrogen, 12% available phosphate, and 26% soluble potash.

Does Jack’s 0-12-26 contain nitrogen?
No. The formula contains 0% nitrogen, allowing nitrogen to be supplied separately through Part B.

What should be used with 0-12-26 Part A?
It is designed to be used with Jack’s Nutrients 15-0-0 Cal Nit Part B as part of a complete nutrient program.

How much 0-12-26 should I use per 10 L?
The Jack’s 321 + 0-12-26 late-flower schedule works out to approximately 10 g per 10 L of water.

How much should I use per 100 L?
Approximately 100 g per 100 L of water in the referenced late-flower schedule.

Can Part A and Part B be mixed together as concentrates?
No. Keep concentrated Part A and Part B separate and add them individually to the irrigation water.

Is it suitable for hydroponics?
Yes. Its fully water-soluble formulation is suitable for hydroponics, fertigation, drip irrigation, and controlled-environment systems.