Most plant nutrients are available to a plant at pH 6.5. Soil pH is either acidic or alkaline. The lower the number, the more acidic the soil. The higher the number, the more alkaline the soil. If a soil has pH of 7, it is considered to be neutral.
It goes without saying that plants that grow in organically rich environment receive their nutrients directly from decomposed and recycled plant matter. This way they get all the plant nutrients required for a healthy and balanced growth. Unfortunately, many gardens and potted plants do not enjoy these benefits and have to be given plant nutrients in the form of fertilizers.
When you buy packaged fertilizer, it will contain a percentage of nitrogen, phosphorus and potassium. The law requires the packs to give full information regarding the percentage; so you will see figures like 10-10-10 or 25-15-30. This will allow you to measure plant nutrients where each number corresponds to nitrogen, phosphorus and potassium. The first number is for nitrogen, the second for phosphorus and the third for potassium. Many chemical fertilizers also contain trace elements and minor plant nutrients like calcium, iron, magnesium, copper, etc. You should know what sort of fertilizer your plants need to buy one.
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