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 Assessing soil acidity and alkalinity is a crucial aspect of agricultural and horticultural management, directly impacting plant growth and nutrient absorption. Here are several common methods: 1. Judging by Soil Color Acidic soil: Typically darker in color, often dark brown. Alkaline soil: Mostly lighter in color, such as white or yellow. In some saline-alkali areas, a layer of white salt and alkali often forms on the soil surface. 2. Judging by Soil Texture Acidic soil: Loose and highly permeable. Alkaline soil: Hard and prone to compaction, with poor permeability. 3. Judging by Handfeel Acidic soil: Feels soft when held in the hand and easily breaks apart when released. Alkaline soil: Feels firm when held in the hand and easily clumps together when released. 4. Judging by Watering: Acidic soil: Water seeps quickly after watering, with no white bubbles and a murky surface. Alkaline soil: After watering, water seeps slowly into the soil, producing white bubbles and foam, and som...

Daily Drinking Scenarios: To ensure drinking water safety, regular testing is required to prevent harmful substances such as bacteria, viruses, and heavy metals that could pose health risks. Special Environment Scenarios: After a flood, drinking water, such as well water, is susceptible to contamination by pathogenic microorganisms and chemicals. Therefore, testing is required for indicators such as color, turbidity, residual chlorine, and total bacterial count. Industrial Production Scenarios Production Process Assurance: Different industrial processes have different water quality requirements. For example, some chemical reactions require specific water quality conditions. Testing can ensure smooth production and avoid accidents caused by water quality issues. Water Quality Control: Industrial water use requires monitoring of key indicators to ensure stable production processes and provide data support for process optimization. Environmental Protection and Monitoring Scenarios Natural...

Impact on the Respiratory System Air pollution is particularly harmful to the respiratory system. Particulate matter (such as PM2.5 and PM10) can enter the respiratory tract, irritating the nose and throat, causing symptoms such as coughing, wheezing, and difficulty breathing. Long-term exposure can increase the incidence of chronic obstructive pulmonary disease (COPD), bronchitis, and asthma. Furthermore, pollutants damage the alveoli and respiratory mucosa, reducing lung ventilation and air exchange, decreasing vital capacity, and gradually weakening lung function, affecting the body's breathing capacity and endurance. Impact on the Cardiovascular System Particulate matter and other particles in air pollution can enter the bloodstream, triggering inflammation and oxidative stress, promoting the formation of atherosclerotic plaques, and increasing the risk of cardiovascular diseases such as coronary heart disease, myocardial infarction, and stroke. Pollutants can also affect the ...