Micronutrients include iron, zinc, manganese, boron, and others. They play essential roles in key physiological processes such as photosynthesis, enzyme activity, and nutrient transport. Although plants require only small amounts of micronutrients, they are indispensable for normal growth. When crops are deficient in micronutrients, growth abnormalities or reduced quality often occur. Therefore, whether supplementation is necessary depends on the actual cultivation environment and crop conditions.

For example, alkaline soils are more likely to cause iron or zinc deficiencies. Continuous cropping systems or high-yield crops may also experience imbalances due to excessive nutrient uptake. In greenhouse or protected cultivation systems, repeated soil use often leads to micronutrient imbalance. Supplementation can be applied through foliar fertilization for rapid correction or soil application for long-term improvement, but excessive application should be avoided, as too much micronutrients can also cause toxicity to plants.

In practical management, a “preventive supplementation + regular monitoring” approach is recommended. During rapid growth stages, before and after flowering, or under high temperature and high humidity conditions, appropriate micronutrient supplementation can reduce the risk of deficiency. At the same time, excessive use of single macronutrient fertilizers such as nitrogen, phosphorus, and potassium should be avoided, as it may inhibit micronutrient uptake and lead to hidden deficiencies.