Humic acid is a substance necessary for plant growth. We can prove in practice that plants need humic acid.
(1) Some deforestation pioneers often give up planting crops in one place after 1-2 years. The reason is that after planting crops, the organic matter in the soil is consumed in large quantities. If it is not replenished, crops cannot be planted again. And 70% of the soil organic matter is humus containing humic acid. Usually, land with less than 3% soil organic matter cannot be used as nursery ground and farmland.
(2) When we apply humic acid to crops, it can enter the plant body through the roots, stems and leaves. Wheat isotope experiments have confirmed this. Plants can absorb this type of substance from the soil and circulate it in the plant body.
(3) When we apply humic fertilizer or fulvic acid, we can see that the shape, color and size of the crops have obvious changes, such as becoming greener, stronger and growing more vigorously. It proves that humic acid participates in plant metabolism and plays a good promoting role.
(4) The same crop planted in soil with high organic matter content usually has higher yield than the crop planted in soil with low organic matter content, which also proves the role of humic acid.
The above proves that the growth and development of plants cannot be separated from humic acid. Plants can use it to show good economic and ecological benefits through the physiological effects of humic acid in plants.