1. Salinization. Due to the large amount of chemical fertilizer applied or long-term watering with high salt content, the salt ions in the soil increase continuously, and the salinization is aggravated, which is easy to form physiological drought and inhibit the growth and development of vegetables. The more serious signs of salinization are: the surface of the dry soil becomes white or red; the surface of the wet soil is long green hair. Generally, the soil salt content is higher than 0.3%, the salinization is more serious, and the soil properties are worse. 2. Soil compaction. In the greenhouse cultivation of greenhouse vegetables, a large number of chemical fertilizers are applied, neglecting the application of organic fertilizers, resulting in lack of organic matter in the soil, poor agglomerate structure, poor gas permeability, low aerobic microbial activity, soil compaction, increased bulk density, reduced porosity, and permeability through water permeability. Poor, hindering the normal stretching of vegetable roots. In many vegetable areas, such as some vegetable farmers in the Binxing area of ​​Binzhou, there is basically no organic fertilizer such as chicken manure when planting shed vegetables. The amount of commercial organic fertilizer is not large. Only a large amount of chemical fertilizer is used, which causes soil fatigue in some sheds. 3. Increased soil pathogens and harmful substances. Affected by the local market and planting habits, greenhouse vegetable cultivation is very strong and professional. The same vegetable is grown all the year round. Years of continuous cropping have caused the accumulation of pathogens and substances harmful to vegetables in the soil, which has seriously affected the growth of vegetables. In recent years, the occurrence of vegetable root diseases such as blight, root knot nematode, and bacterial wilt has been aggravated, forcing many vegetable farmers to replant other vegetables. For the soil, it is necessary to raise the ground for the fat. Soil is a large warehouse for fertilizers, but insufficient organic matter can make the soil structure worse, the ability to store and supply fertilizers declines, and the soil becomes more and more “squeakyâ€. Although a large amount of chemical fertilizer is applied, the fertilizer cannot remain in the soil layer where the root system is located, and is easily lost with water, or is quickly fixed by the soil, and the root system of the plant cannot be absorbed and utilized, so that the effective utilization rate of the fertilizer is greatly reduced. 4. Lack of trace elements. Many vegetable fields have been repeatedly cropped for many years, and the application of organic fertilizer is insufficient. The micro-fertilizer is basically not applied, so that the trace elements such as zinc, boron, molybdenum and iron in the soil are gradually lacking, which affects the healthy growth of vegetables. The amount of trace elements absorbed by different vegetables is also different. Long-term planting of a vegetable will result in the lack of certain elements in the soil, and even serious physiological diseases will occur in a large area. Micro-fertilizer can be solved by foliar topdressing, but the most thorough method is soil shed soil fatigue refers to the cultivation of greenhouse vegetables after many years. Because of unreasonable fertilization, continuous cropping and other reasons, soil conditions are gradually degraded, and physical and chemical properties are deteriorated. It affects the normal growth of vegetables and makes vegetable diseases more serious. The performance of soil fatigue mainly has the above four points. During plant growth, a series of metabolic and biochemical processes are carried out, forming and accumulating various chemical substances, which constitute the chemical composition of plants. Plant extracts are very complex, and there are many types of chemical components, and the components of different parts are different. General plants contain the following types of chemical components: alkaloids, glycosides, organic acids, resins (including resin acids, resin alcohols and resin hydrocarbons), volatile oils, sugars (including starch, inulin, gums and mucilage, etc.) , amino acids, proteins and enzymes, tannins, plant pigments (including chlorophyll, carotene, flavonoids, beta red bases and quinones, etc.), oils and waxes, and inorganic components (trace elements). Pure natural plant extract,Salvia Miltiorrhiza Seeds Extract,Eclipta Prosteata Extract Powder,Piperine,Piperine Extract,Damiana Extract Xi'an Henrikang Biotech Co.,Ltd , https://www.henruikangbio.com
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What is the soil fatigue of greenhouse vegetables?