I believe that many friends in the greenhouse have discovered the phenomenon of green moss or red moss in their soil, but I don’t know why. What should I do?
Today, let's analyze together, the soil turns red, and it turns out to be green.
In general, there are three reasons why the soil turns red and turns green:
First, the soil is acidified.
Soil acidification is the decline of soil pH. It has been determined that the pH value of soil in some parts of northern China has dropped to below 3.0, but the pH range for most crops is between 5.5 and 7.5. How can crops grow in such an acidic environment?
The reason for the acidification of soil is the application of a large number of physiological acid fertilizers, such as potassium chloride, potassium sulfate, ammonium chloride, ammonium sulfate, etc., and the temperature and humidity in the shed are high, and it is rarely leached by rainwater, with the increase of cultivation years. The accumulation of acid ions in the ploughed soil is becoming more and more serious, leading to acidification of the soil.
Second, the soil is salinized.
Excessive use of long-term chemical fertilizers, soil crops can not be completely absorbed, and finally left in the soil, in fact, chemical fertilizers are inorganic salts, which causes the soil salt content in the greenhouse to rise, after the water evaporates, the salt remains in the surface layer of the soil, and gradually becomes red after oxidation. Salinized soils are generally high in pH and can range from 8-10.
Third, the soil is eutrophic.
The reason for this phenomenon is that the field management is improper, causing salt segregation caused by soil impermeability and excessive evaporation to accumulate on the soil surface. Because salt is concentrated on the soil surface, it is suitable for some algae to survive. If the soil surface is dry, Algae die and red in the algae residue.
So how to solve the phenomenon of redness on the soil surface?
First, we must rationally apply fertilizer.
Reduce the use of chemical fertilizers, with the application of organic fertilizers and biological fertilizers. Promote fertilizer utilization and regulate soil pH. Improve the physical structure of the soil. The data show that soil pH has a great influence on the effectiveness of fertilizer application. For example, nitrogen in soil is most effective in the range of pH 6-8; phosphorus is most effective at pH 6.5-7.5; potassium, calcium, magnesium and sulfur are most effective at pH 6-8; iron, manganese and copper Trace elements such as zinc and boron are generally most effective under acidic conditions.
Reduce the use of compound fertilizer, use more water-soluble fertilizers, improve fertilizer utilization; reduce residue.
Second, the irrigation method should be reasonable.
Change flood irrigation to drip irrigation, save water and reduce fertilizer damage.
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