There are many kinds of chemical fertilizers, and there are more than 10 commonly used ones. Some fertilizers used in vegetables can improve the quality and yield, but some fertilizers can increase the yield when applied to vegetables, but it will cause toxin contamination of vegetables, causing food poisoning and even life-threatening.
For example, ammonium nitrate and other nitrate nitrogen are generally not suitable for eating vegetables, especially leafy vegetables such as cabbage, vegetables, spinach, etc., because the applied nitrogenous fertilizers will double the nitrate content of vegetables after being applied to vegetable fields. It is easily reduced to nitrite in the human body. Nitrite is a highly toxic substance that is extremely harmful to the human body and is a carcinogen.
Ammonium chloride, potassium chloride and other chemical fertilizers containing chlorine should not be applied to crops such as tomatoes, potatoes, sweet potatoes, and yellow crops. After the chlorinated fertilizer is decomposed in the soil, ammonia or potassium ions will be absorbed by the soil and absorbed by crops. When the concentration reaches a certain level, it will be toxic to the plant roots. It will reduce the starch and sugar content of the product, affect the yield and quality, and in severe cases it will cause the crop to die.
An Analytical Balance (often called a "lab balance") is a class of balance designed to measure small mass in the sub-milligram range. The measuring pan of an analytical balance (0.1 mg or better) is inside a transparent enclosure with doors so that dust does not collect and so any air currents in the room do not affect the balance's operation. This enclosure is often called a draft shield. The use of a mechanically vented balance safety enclosure, which has uniquely designed acrylic airfoils, allows a smooth turbulence-free airflow that prevents balance fluctuation and the measure of mass down to 1 μg without fluctuations or loss of product.[citation needed] Also, the sample must be at room temperature to prevent natural convection from forming air currents inside the enclosure from causing an error in reading. Single pan mechanical substitution balance maintains consistent response throughout the useful capacity is achieved by maintaining a constant load on the balance beam, thus the fulcrum, by subtracting mass on the same side of the beam to which the sample is added.[citation needed]
Electronic analytical scales measure the force needed to counter the mass being measured rather than using actual masses. As such they must have calibration adjustments made to compensate for gravitational differences. They use an electromagnet to generate a force to counter the sample being measured and outputs the result by measuring the force needed to achieve balance. Such measurement device is called electromagnetic force restoration sensor.
Analytical Balance
Electronic Analytical Balance,Analytical Balance,Electric Weighing Scale,Digital Sensitive Weighing Scales
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