The acidity and alkalinity of soilless cultivated nutrients

the degree of
of the
is usually expressed
pH. Most plant roots grow best in the weak acidic range of pH5.5 to 6.5, so soilless cultivated nutrients should also have pH in this range. The pH of the nutrient solution is very important because it relates to the solubility of various salts and the passability of the primary membrane of the crop cells to the salts. The plant's adaptation range to pH is narrower than electrical heterogeneity, and when the pH is not suitable, the roots of the crop are yellow and necrote, while the leaves lose their greenness. Therefore, in the circulating nutrient liquid system, every day to determine and adjust the pH, in the non-circulatory system, each time the preparation of nutrient liquid, should pay attention to adjust the pH.。The
way to measure the pH value of
pH
the test paper. But this can only measure the approximate range, China has produced a variety of handheld pH instrument, the measurement method is simple, fast, and accurate, is a large area of soilless cultivation of the necessary instruments.。