How can the amount of concentration in the fertiliser affect the growth of the plants?

The concentration of fertilizer can significantly affect the growth of plants in several ways:

1. Nutrient Availability: Fertilizers are primarily used to provide additional nutrients that plants need for growth that may not be available in the soil. The concentration of the fertilizer determines the amount of these nutrients that are available to the plant.

2. Optimal Growth: For optimal growth, plants require a balanced amount of nutrients. Too little and the plant may show signs of deficiency and stunted growth. On the other hand, an excess of nutrients, especially nitrogen, can lead to excessive vegetative growth at the expense of fruit or flower production.

3. Nutrient Burn: High concentrations of fertilizer can lead to a condition known as nutrient burn. This is essentially a chemical burn caused by excessive nutrients, particularly salts, which can damage or kill plant tissues, leading to stunted growth, leaf drop, or even plant death.

4. Soil Health: Over time, excessive use of high-concentration fertilizers can lead to a buildup of salts in the soil, which can damage the soil structure and its ability to hold water, further affecting plant health and growth.

5. Environmental Impact: Runoff from high-concentration fertilizers can also pollute nearby water sources, affecting aquatic life and other plants.

Therefore, it's important to use the right concentration of fertilizer for the specific plant and soil conditions to ensure healthy plant growth.