✔️Primary (macro) nutrients are nitrogen, phosphorus, and potassium. They are the most frequently required in a crop fertilization program. Also, they are need in the greatest total quantity by plants as fertilizer. NITROGEN
✔️It makes the soil soft and fertile & It provides immunity to the plant for resistance against diseases and pest attacks.
✔️It provides macro nutrients like nitrogen, potassium, phosphorus and micro nutrients
✔️The secondary nutrients are calcium, magnesium, and sulphur. For most crops, these three are needed in lesser amounts that the primary nutrients. They are growing in importance in crop fertilization programs due to more stringent clean air standards and efforts to improve the environment.