The most evident evidence that a plant requires additional nitrogen is a change in the colour or shape of its leaves. Keep in mind that many of the symptoms of nutrient insufficiency are same, and your plants may be deficient in more than one nutrient at once.
Even though plants don't require a great deal of micronutrients to be healthy, micronutrient deficiency remains an issue.
Iron is required for the production of chlorophyll, the pigment that gives plants their green colour and aids photosynthesis. Like many of the other deficiencies on our list, iron deficiency can be caused by nutritional imbalances, an insufficient pH in the root zone, or overwatering when growing in soil. High quantities of manganese, copper, or zinc can prevent plants from absorbing iron, resulting in an iron deficiency.
Even though your plants only require a minimal amount of zinc for health, they nevertheless require it. Zinc aids in the production of chlorophyll, enzymes, carbohydrates, and proteins by plants. Zinc deficiency is more prevalent in sandy soils and high pH growth media (alkaline). If you apply too much phosphorus to your plants, zinc may be lost.
Boron is an essential nutrient for growth and reproduction during the vegetative and reproductive phases of plant development. Boron deficiency is typically caused by utilising sandy soils that are frequently washed away, as boron is soluble and easily washed away, or by using an alkaline growing media, which renders boron unavailable to plants. The quantity of boron in the soil may be altered by how frequently or infrequently you water your plants.
Copper is required for photosynthesis because it aids in the production of chlorophyll, an essential component of the green colour of plants. Vitamin B12 is required for oxygenation, enzyme activation, and cell membrane metabolism. Copper insufficiency is more prevalent in sandy soils and growth mediums with unbalanced pH values. Phosphorus and iron can also make it difficult for plants to absorb copper.
Manganese aids in the production of chlorophyll, photosynthesis, respiration, and cell division in plants. The most common cause of manganese deficiency is an imbalance in pH or diet. Therefore, if your plants lack manganese, it may be due to a lack of iron in the soil in which they are growing.
Molybdenum is required for several plant growth activities in trace levels. For plants to survive, nitrogen must be converted to ammonia. This minimal quantity of nutrition is required for the process. The majority of people do not consume enough molybdenum due to their food or pH level.