Potassium Nitrate 1 kg

The engine of growth and quality in your production. Granular potassium nitrate, with a composition of 13.5% N / 45.5% K₂O, is one of the most important macronutrients in hydroponic production – directly influencing vegetative growth, the plant’s water regulation, protein synthesis and final fruit quality. Sold in a 1 kg pack, it is ideal for supplementing or adjusting the potassium in the nutrient solution of any hydroponic system – NFT, DWC, aeroponics or substrate.

Technical Features

• Nutrient: granular potassium nitrate
• Composition: 13.5% N (nitrogen) / 45.5% K₂O (potassium)
• Pack: 1 kg
• Average dose: 500–650 grams per 1000 litres of water in the tank
• Form: granules – dissolve easily in water

What does potassium do for plants?

Potassium is the macronutrient present in the largest amount in plants – and one of the most demanding in terms of continuous replenishment. Unlike nitrogen and phosphorus, it is not part of the plant’s structure, but it activates hundreds of essential metabolic processes:

• Regulates stomata – controls the opening and closing of stomatal guard cells, regulating transpiration and CO₂ intake
• Osmotic regulation – controls water movement between cells, maintaining turgor and the plant’s water status
• Protein synthesis – activates the enzymes that produce structural proteins
• Cellular pH regulation – maintains the acid–base balance inside cells
• Fruit quality – high potassium levels during fruiting increase sugar content, improve colour and extend post-harvest life
• Growth and development – strongly influences the plant’s overall vegetative vigour

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.