Test and Analysis of Nutrients in Maize Soil by Soil Tester
Corn is a very common crop and requires many nutrients in corn growth. The soil tester can help us to understand the composition and content of trace elements in soil and provide guidance for fertilization in soil.
Like other green plants, corn can absorb inorganic substances from the outside world for assimilation and use to form organic substances and supply its own needs for growth and development. The necessary nutrients for corn growth include carbon, hydrogen, oxygen, nitrogen, phosphorus, potassium, calcium, magnesium, silicon, copper, iron, sulfur, manganese, zinc, boron, aluminum, and chlorine. According to their content in the corn plant, they can be divided into a large number of elements and trace elements. A large number of elements refer to nitrogen, phosphorus, potassium, sulfur, calcium, silicon, magnesium, carbon, hydrogen, and oxygen. Trace elements are found in small amounts in plants, mainly iron, manganese, boron, zinc, molybdenum, and chlorine.
Each nutrient element necessary for corn growth has its own specific physiological role and is indispensable and cannot substitute for each other. Carbon, hydrogen, and oxygen are produced by the photolysis of water absorbed from the air and absorbed from the soil. They constitute the major part of corn production, accounting for approximately 99% of the fresh corn weight. Other elements are mainly absorbed from the soil, soil testers for corn The analysis of soil elements shows that the requirements for nitrogen, phosphorus, and potassium are the most, while the effective content in soil is small, and it is often necessary to supplement them by fertilizing to meet the requirements of corn growth. Therefore, nitrogen, phosphorus, and potassium are called the three elements of growth. . Others, like sulfur, calcium, silicon, and magnesium, require less, called intermediate elements.
The dryer is a kind of mechanical equipment that uses heat energy to reduce the moisture content of materials. It is used to stop the drying operation of objects and vaporize the moisture (usually moisture or other volatile liquid components) in the materials after heating to obtain solid materials with regular moisture content. The purpose of drying is to meet the requirements of material application or further processing.
The future development of dryers will develop and improve dryers under the conditions of deepening the study of drying mechanism and material drying characteristics, and controlling the operation conditions of different materials; In addition, large-scale, high strength, high economy, and improved compliance with raw materials and quality are the fundamental trends of dryer development. Now let's introduce the function, working principle, classification, operating procedures, selection instructions and cleaning methods of the dryer.
The dryer acts as a refrigeration compressor to suck the low pressure (low temperature) refrigerant in the evaporator into the compressor cylinder. The refrigerant steam is compressed, and the pressure and temperature rise at the same time; The refrigerant steam with high pressure and high temperature is pressed to the condenser. In the condenser, the refrigerant steam with higher temperature and cooling water or air with lower temperature stop heat exchange.
The heat of the refrigerant is taken away by water or air and condensed, and the refrigerant vapor becomes liquid. This local liquid is then sent to the contraction valve, which is throttled into a low temperature and low pressure liquid and enters the evaporator; The low temperature and low pressure refrigerant liquid in the evaporator absorbs the heat of the compressed air and vaporizes (commonly known as "evaporation"), while the compressed air condenses a large amount of liquid water after cooling; The refrigerant steam in the evaporator is sucked away by the compressor.
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