Fertilizer is a substance added to soil to help plants grow. Fertilizer is divided into two groups: natural and synthetic. Fertilizer provides one or more of the chemical elements essential for plant nutrition. Natural fertilizers are items like animal excrement, straw, other plant materials, guano, animal tankage and meat and bone meals, and bone meals and flours. All natural fertilizers are from nature. Synthetic fertilizers come in either liquid or solid. They are usually classified …showed first 75 words of 239 total…

…showed last 75 words of 239 total…potassium fertilizers (fertilizers that are water soluble). Synthetic fertilizers are also called chemical fertilizers. They have three groups of elements involved in making them. The primary elements include nitrogen, phosphorus, and potassium. These elements are required in the biggest amount. The secondary elements are sulfur, calcium, and magnesium. These elements are required in smaller amounts. The other elements are boron, cobalt, copper, iron, manganese, molybdenum, and zinc. These elements are only required in trace amounts.