The content of each nutrient element in plants is very different, but each has its own unique physiological function. It is equally important and irreplaceable for plant growth and development. It can be summarized in the following three aspects:
1. The composition of participating plants is a structural part of plant body or a constituent part of living matter. For example, various sugars, starches, and cellulose in crops, commonly known as carbohydrates, are composed of carbon, hydrogen, and oxygen. Protein, nucleic acid, chlorophyll, etc., in addition to carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur, magnesium and other elements to participate. For example, magnesium is a component of chloroplasts.
2. Promote the metabolism of plants.
3. It has special functions for plant life activities. For example, potassium is not a component of a substance in plants, but exists in an inorganic ionic state. It can make cells swell with water, which is beneficial to the metabolism and reduce the transpiration of plants. It also improves the photosynthesis intensity, facilitates the synthesis of sugar and starch, and increases the drought and cold resistance of plants. Molybdenum is a component of legume rhizobia, and sulfur also participates in nitrogen fixation. Calcium and magnesium also have some special functions to regulate life activities in plants.