There are 16 kinds of nutrients needed for crop growth and development. These are respectively carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, manganese, copper, zinc, boron, aluminum, and chlorine. The demand for the first nine elements of the plant is large, which is called a large number of elements; the demand for the latter seven elements is small, which is called trace elements. Although the amount of a large number of elements and trace elements required by a plant is somewhat different, they are equally important to plants and are indispensable. They are irreplaceable.
Among the 16 nutrients necessary for plants, nitrogen, phosphorus, and potassium are the most demanding, while the available nutrient content in soil is low. Generally, it is necessary to apply fertilizers in seasons or years to meet the needs of plants. Therefore, people often refer to nitrogen, phosphorus and potassium as "three elements of fertilizer." Although the demand for trace elements in plants is not large, they may lack these nutrient elements. Plants often have obvious deficiency, leading to a large area of ​​reduced production. Therefore, it is necessary to comprehensively consider the various nutrients needed for crops when fertilizing.
There are three types of metal base facial beds. The first one is a beauty bed that can be folded and carried conveniently. It includes a face pillow support, a face pillow countersunk plug, a bed bag and a handrail plate. The size is generally 184*70 centimeters, the sponge thickness is about 3.5 centimeters, the net weight is about12.5kg, the folded size is 92*70*20 centimeters, generally used to participate in various exhibitions, the second is the manual adjustment of the beauty bed, it It can be done in a chair style or in a bed style. The style of a chair can be relatively convenient. It can be laid flat. The back and legs can be adjusted manually in multiple stages. The overall height is generally fixed at60 cm. The third type is the electric control of the beauty bed, the motor is the EU CE certification, the motor coil is made of copper core, good stability, no noise, durability, easy operation and so on.
Metal Base Facial Bed,Strong Metal Base Facial Bed,Facial Bed With Metal Base,Spa Facial Massage Bed
MING MEI ROYAL SPA FURNITURE , https://www.mingmeibeauty.com