The pH value is a central value in many areas of application: Chemistry, agriculture, horticulture, aquaculture, aquariums, water treatment, wastewater treatment, healthcare, food industry and art restoration to name but a few.
In agriculture and horticulture, the pH value of soil and substrates is a central parameter for the growth conditions in the root zone, and has a considerable influence on plant nutrition, growth and plant health.
Nutrient availability for and nutrient uptake by plants are also determined by the pH value of the soil: At low pH, the availability of nitrogen, phosphorus, potash, calcium, magnesium and molybdenum is limited; at high pH, nitrogen, calcium, magnesium, iron, manganese, copper and zinc are poorly available. Therefore, quick, easy and accurate measurements of pH are important. pH is also an important parameter for evaluating water for aquaculture and irrigation purposes. Another important agricultural application is the measurement of the pH value of spray liquids.