It is often reported by some vegetable farmers that the effects of increasing fertilization in freshly-prepared vegetable crop lands are obvious. In addition, fertilizing many vegetable crops that grow vegetables all year round can easily cause fertilizer damage, and sometimes it will reduce production.

In layman's terms, the ability of vegetables to absorb and use fertilizers depends on the "seepage pit" that occurs in the concentration of sucrose in the fiber itself. In the lettuce field where fresh vegetables are grown, the concentration of soil nutrient solution is small, and the "seepage pit" is large. Catering to the urgent demand for vegetables and the rapid absorption and utilization of vegetables, it has contributed to the obvious effect of more fertilization and more production. In addition, the regular vegetable-growing vegetable plots have enough nutrients to “seep” pits and even lose the effect of “seepage pits”. Excessive fertilization of such vegetable plots will not only promote the absorption and utilization of fertilizers by vegetables, but will lead to plant growth. Nutrients in the body are blocked, causing many phenomena such as dehydration dead seedlings, rot-root dead seedlings and so on.

In addition, there are some soil aging phenomena in many ripe vegetable fields that grow vegetables all year round. The main performance is: due to a large number of fertilizers such as compound fertilizer and diammonium, neglecting the application of organic fertilizers, resulting in soil compaction, reduced air permeability, decreased aerobic microbial activity, poor root development, and vulnerability to diseases; excessive application of fertilizers, vegetable pH Increased soil salinization aggravated; for many years continuous cropping, trace elements such as zinc, boron, iron, and molybdenum in the soil were greatly absorbed by vegetables and were not supplemented, seriously affecting the growth and development of vegetables; vegetable plots were mostly used for manual digging and soil Ploughing becomes shallow, affecting the extension of the root system. The time for growing vegetables in lettuce is not long, and the above phenomenon will not occur. Therefore, the utilization rate of fertilizer is high and the effect of increasing yield is significant.

To make vegetables grow normally and obtain good benefits of increasing production and income, it is imperative to apply appropriate fertilization so that the vegetable field maintains an appropriate nutrient concentration and allows the vegetables to maintain a moderate plant "seepage" effect. The principle of scientific fertilization is to increase the use of large amounts of decomposed organic fertilizer. In particular, it is advisable to stop using chemical fertilizers and a single nitrogen fertilizer in cooked vegetable fields in order to improve the structure of the soil granules and make the water, fertilizer, and gas heat significantly coordinated. The second is to reform the soil that has been acidified or alkalized. In addition to the application of organic fertilizers, neutral fertilizers should be applied in an appropriate amount. For example, the soil can be acidified and can be neutralized with lime or ash, and the soil can be alkalinized and ammonium sulfate can be used. Calcium phosphate regulation to improve the acidity of vegetable soil. The third is to implement reasonable rotation of vegetables in different subjects. Whether it is lettuce or cooked vegetables, it is not advisable to plant the same kind of vegetables in the same vegetable field for several consecutive trips. Fourth, adhere to the principle of scientific fertilization, maintaining 19 kg of pure nitrogen per acre, 7 kg of available phosphorus, and 30 kg of pure potassium. Before fertilization, test the effective content of the soil first, then measure the varieties and quantities that need to be supplemented, and then determine the application method and quantity depending on the species and the seedlings. The general principle is: "Raw lettuce fields" and thin soil of the vegetable fields and more facilities; "cooking of vegetable fields" and fertile soil in the vegetable plots to be less; appropriate to add boron, zinc fertilizer, pay attention to acupuncture multi-element vegetable fertilizer; The harmful seedlings timely controlled the fertilizer and sprayed the growth regulator outside the root; when the salt damage and fertilizer damage occurred, the vegetable field was watered in time, covering the thin soil, pressing the salt and buffering the nutrient concentration of the soil, so as to prevent the vegetables from being “supported” by the fertilizer.

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