MAP Monoammonium Phosphate 1 kg

The right boost for your plants from day one. Granular MAP (monoammonium phosphate), with a composition of 12% N / 61% P₂O₅, is one of the most efficient fertilisers for the early growing stage – supplying fast-absorbing phosphorus and nitrogen that plants need to germinate, root and grow vigorously.

Sold in a 1 kg pack, it is ideal for supplementing or adjusting the phosphorus in the nutrient solution of any hydroponic system – with one of the lowest doses in the range (just 150 g per 1000 L), making it extremely cost-effective.

Technical Features

• Nutrient: MAP – granular monoammonium phosphate
• Composition: 12% N (ammoniacal nitrogen) / 61% P₂O₅ (phosphorus)
• Pack: 1 kg
• Average dose: 150 grams per 1000 litres of water in the tank
• Form: granules – fast dissolution and uptake
• Yield: 1 kg = enough for up to 6600 litres of nutrient solution

What does MAP do for plants?

MAP combines two essential nutrients in one source – phosphorus and ammoniacal nitrogen – with a unique synergy: the ammoniacal nitrogen in MAP helps plants absorb phosphorus, making it more efficient than other phosphorus sources:

• Stimulates germination – phosphorus is critical for activating seeds and developing the first roots
• Promotes rooting – essential for a strong, branched root system
• Fast uptake – ammoniacal nitrogen boosts phosphorus entry into root cells
• Energy transfer – phosphorus is a component of ATP, the energy molecule of plant cells
• DNA and RNA synthesis – essential for cell division and growth
• Supports flowering – the right amount of phosphorus helps a healthy transition from vegetative growth to flowering

How do you control these parameters?

Nutrient solution

The plant consumes the solution, and every day the volume in the tank drops. This volume should be topped up every day with water, not with nutrient solution. Plants absorb much more water than nutrients, and since the nutrient solution is saline, topping up with solution every day salinises it until the dissolved salts exceed what the roots can tolerate. If this happens, plants stop growing – not from a lack of nutrients, but because of an excessively high osmotic potential at the roots.

Control the pH of the nutrient solution

As they take up nutrients, plant roots change the pH of the nutrient solution. The pH indicates how acidic or alkaline the nutrient solution is. Plants develop best between pH 5.5 and 6.5, and as they grow they change the pH of the solution. That is why the pH should be measured every day after topping up the solution with water. If it is outside the 5.5–6.5 range, adjust it with acid if above 6.5, or with base if below 5.5.

Control the electrical conductivity of the nutrient solution

As plants grow, the nutrients in the solution are used up and the solution becomes depleted. Eventually the solution can no longer supply the nutrients the plants need. At that point the solution should be replaced. One of the biggest problems is knowing when to change it.

A solution containing salts (nutrients) can conduct electric current. The higher the concentration of dissolved salts, the greater this conductivity. So a drop in electrical conductivity tells you when the nutrient solution needs changing. The easiest way to know the nutrient concentration is to use a conductivity meter.

One of the main reasons growers choose water-culture systems is that growth and maturity are usually 15–25% faster. Growers can still reach the desired plant size with a short vegetative period. So to get optimal early production from these systems, using the right nutrient mix and having the right conditions matter far more.