Functional fertilizers cannot be used continuously and alone.

Functional fertilizer refers to the fertilizer that not only contains a small amount of nutrient elements to supply the growth of vegetables, but also has other functions, such as promoting the rooting of vegetables, improving the stress resistance of plants or improving the disease resistance of vegetables, so when there are some problems in vegetables, vegetable farmers often use functional fertilizers to regulate the growth of plants, which can often achieve good results. However, when the reporter interviewed in the street of the ancient city of Shouguang City, many vegetable farmers asked the reporter: why is the effect of functional fertilizer better in the first two times, but after continuous use alone, the effect is less and less obvious? It turns out that when some vegetable farmers apply functional fertilizers, they see that the effect is obvious at the beginning of use, which can well promote the growth of vegetables, so they think that functional fertilizers can also meet the needs of mineral elements for vegetable growth. as a result, functional fertilizers are used continuously for a long time, but the effect is less and less obvious. The reason is that at the beginning of the use of functional fertilizers, more fertilizers were originally used in the soil with sufficient nutrient content, and mineral element fertilizers were not used in a short period of time, and the functional fertilizers used can also promote the absorption and utilization of mineral elements by vegetables. to meet the needs of vegetable growth. However, because the content of mineral nutrients in most functional fertilizers is low, if they are not combined with water-soluble fertilizers or compound fertilizers, there will be less and less nitrogen, phosphorus, potassium and other trace elements in the soil, resulting in worse and worse growth of vegetables, so functional fertilizers can not be used continuously and alone.