There are many varieties of fertilizer on the market, and the method of differentiating the types of fertilizers has become very important. Some companies have misprinted misleading language such as “full nutrition†and “explosive nuclear power†on the packaging bags in order to induce farmers’ desire to purchase. , people can not understand the mind. For this reason, the author summarizes the following methods for differentiating the types of fertilizers so that farmers' friends do not let some manufacturers flicker.
According to the nature of the components can be divided into inorganic fertilizers, organic fertilizers and biological fertilizers. Inorganic fertilizers are also called chemical fertilizers, such as nitrogen fertilizers, phosphate fertilizers, potash fertilizers, compound fertilizers, etc. Organic fertilizers are also called farmyard fertilizers such as manure, green manure, cake manure, ring manure, and compost; biological fertilizers are fertilizers that improve plant nutrient conditions and generally cannot Direct supply of nutrients. According to the requirements of the crop on the elements can be divided into large, medium and trace element fertilizers. A large number of elements such as nitrogen fertilizers, phosphate fertilizers, and potassium fertilizers; medium-element element fertilizers such as calcium, magnesium, and sulfur; trace element fertilizers such as iron, manganese, boron, zinc, copper, and molybdenum.
Compound fertilizer refers to fertilizer containing at least two of the three nutrient elements of nitrogen, phosphorus, and potassium. The formula fertilizer that is currently widely used in production also belongs to the category of compound fertilizers. The difference from common compound fertilizers is that formula fertilizers are determined according to the nutrient contents of nitrogen, phosphorus, and potassium contained in the soil, and the laws requiring fertilizers for different crops. "Formulation" for production, to achieve a variety of nutrient balance supply, what to add to the lack of crops, how much to make up, to increase fertilizer utilization, reduce fertilizer use, improve crop yield, improve the quality of agricultural products, save labor, Festival The purpose of revenue increase. The biggest advantage is that formula fertilization is to convert soil testing and fertilization techniques into fertilizers. Farmers, while applying fertilizers, unknowingly “fall into the ground†soil testing and fertilization techniques.
At present, there are new types of fertilizers called controlled release fertilizers on the market, and some manufacturers also call them "smart fertilizers" or "fool fats." Controlled-release fertilizer is an effective period for delaying the initial release of fertilizer nutrients through various regulatory mechanisms, prolonging the effective period of absorption and utilization of effective nutrients by plants, so that nutrients can be released slowly or controlledly in accordance with the set release rate and release period, which can increase the utilization rate of chemical fertilizers. , Reduce the amount of use and fertilization, reduce production costs, reduce environmental pollution, improve the quality of crop products and so on. Tests have shown that slow and controlled release fertilizers generally increase the effective utilization of fertilizer nutrients by more than 20%.
Venlo structure is a popular one at present. This architecture uses horizontal girder as main bearer, forming a stable structure with columns. There is consolidation between horizontal girder and column, and hinge is used to connect column and foundation.
In Venlo greenhouse, foundation is made of reinforced concrete and the side wall is made of brick or reinforced concrete plate. The steel frame always use hot dip galvanized light steel. Roof beam adopts horizontal girder structure and using herringbone connection. The horizontal girder bears 2 or more roofs, which is made of aluminum alloy. This material is used as roof structure material and also glass inlay material. Other beams using gutter style to minimize the section. Delighting material of the roof and side wall using the hollow double-layer or multilayer PC board.
PC board is mainly made of PC/PET/PMMA/PP materials, it need sun screen coating to resist ultraviolet resist and ageing, and it is also required to be anti condensation and antidrug.
As a kind of light material, use PC board can greatly reduce the weight of greenhouse structure, and corresponding reduced the size of the steel frame, which saving the cost of steel.
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JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.greenhousehydroponic.com