Humic acid is a natural organic substance that is usually used to improve soil structure, promote plant growth, and increase soil fertility. The best season to use usually depends on your needs and the growth cycle of the plant.
Generally speaking, spring and autumn are the best times to use humic acid for the following reasons:
Spring: Spring is the beginning of plant growth, and the soil is warm and moist. Using humic acid at this time can improve soil quality, promote the growth and absorption of nutrients by plant roots, and help plants better absorb water and nutrients during the growing season.
Autumn: Autumn is a transitional stage for plant growth. Humic acid can help the soil maintain a good structure, increase the organic matter content of the soil, provide a good root environment for plants during the winter dormancy period, and also help maintain soil fertility.
It may not be appropriate to use humic acid in summer, because humic acid may be easily decomposed quickly under high temperatures in summer, and the direct stimulation to plants may cause plants to grow too fast or unstable. Humic acid is also less used in winter because the soil temperature is low and the absorption capacity of plants is weak.
Therefore, it is usually most appropriate to use humic acid in spring and autumn. However, the specific use should be adjusted according to soil conditions and plant needs.
