Both macro-and micronutrients are necessary for good plant growth. Soil pH is also important. While your plants must get enough nutrients, the excessive application can cause damage as well as a deficiency. 

Over-application may cause plant growth to be stunted. It may also lead to groundwater contamination by leaching into the soil, or surface water pollution by washing away. Twenty nutrients are required for plants to thrive. These  nutritious for plants include nitrogen, phosphorus, and potassium which are needed in large quantities. 

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They are also required along with calcium and sulfur. The micro-nutrients are the nutrients that are only required in small amounts. These elements include iron, copper, zinc, and boron. Your plants will also benefit from soil that is balanced in pH. 

It is vital to test your soil for pH and nutrients so that your plants have the right balance of nutrients. A pH of 7 or less is neutral. Below 7 acidic is considered alkaline, and 7 or more is considered acidic. 

Because pH has a significant impact on plant nutrients, changing the pH will often solve a problem. A high pH can make many micro-nutrients less bio-available to plants. Even at neutral pH, iron deficiency can be a problem for plants such as blueberries and rhododendrons.