Effect of fertilizer on plant growth
Watering the plant with too little or too much fertilizer will slow down plant growth.
Plants need nutrients to grow and fertilizers are a good source of nutrients that may be lacking in the soil. However too much of anything is not a good thing.
Plants absorb water from the soil into the roots through a process called osmosis. This process will require the salt content inside the roots to be higher than the salt content of the soil. As a result, the water molecules will migrate from the soil into the roots in order to balance the salt level in the soil and in the roots.
Using too much fertilizer will increase the salt content of the soil. If the salt content of the soil becomes higher than the salt content of the roots, the water molecules will migrate out of the root into the soil causing root burn. This will cause the plant to grow more slowly, become dehydrated and eventually die.
Too little fertilizer will cause the plants not being able to grow at the optimal speed due to the lack of nutrients in the soil.
Therefore using the correct amounts of fertilizer recommended by the manufacturer is the safest way for the plants to grow healthily.
Some fertilizers react to solvents - perform the experiment in a well ventilated place and add the fertilizer slowly.