Family hydroponic terrestrial flowers susceptible to root rot

Family hydroponic terrestrial flowers susceptible to root rot

The static hydroponic flowers commonly introduced in the market, according to the root oxygen supply, the first use of dissolved oxygen in the nutrient solution; the second is to receive oxygen directly from the air. The former is immersed in the nutrient solution at the tip of the root, and naturally dissolves oxygen through contact between the surface of the liquid and the air; the latter is the upper end of the root system, that is, the partial root system is exposed to air to directly inhale oxygen. Flower roots were exposed to air and their roots were directly in an environment with an oxygen concentration of 2.310 million ppm (oxygen content in the air is about 21%). The tip of the flower roots was transplanted into water, and the concentration of oxygen in the rhizosphere declined sharply. Saturated dissolved oxygen (<15ppm) limit in water. The difference in oxygen concentration between the two reached 10000 times. At a certain temperature and pressure, the dissolved oxygen in water has reached the maximum amount called saturation saturation of oxygen. Oxygen (O2) dissolved in water has different saturation and dissolution of oxygen at different pressures and temperatures. Family hydroponic flowers, due to the root tip in the nutrient solution, the natural dissolved oxygen concentration on the surface of the water is about 4%-8% of the saturated solubility of oxygen. For example, when the liquid temperature is 20°C, the amount of oxygen dissolved in the hydroponic solution is only about 0.37 ppm to 0.74 ppm. When most of the terrestrial plant hydroponics when the rhizosphere dissolved oxygen content is less than 2.8ppm, the upper leaves begin to wilt; the dissolved oxygen in the rhizosphere reaches 1.5ppm or less, the roots are rapidly deteriorating and the growth is difficult; the dissolved oxygen in the rhizosphere is below 0.5ppm. At that time, the root system almost stopped growing or withering (rot). Hydroponic water is extremely low in dissolved oxygen and extremely difficult to breathe oxygen from roots. It has been reduced to a critical level (0.5ppm) for stopping or dying life of common terrestrial plants. Here, it is emphasized that even if a part of the root of flowers is directly exposed to air, it cannot change the state of oxygen breathing failure that is permanently immersed in the root tip of the nutrient solution to be dangerous, that is, it is difficult to get rid of the bad consequences of “dead water”; No rot, but at the very least it is to extend the life of the plants and maintain their lives. The roots in the water are rootless, and they are inevitably far inferior to those in potted plants. Some static hydroponic flowers are planted in transparent glassware and can also cause light and reaction of carbon dioxide in the nutrient solution. The presence of trace amounts of nutrients such as phosphorus and nitrogen in water will promote the synthesis reaction and increase the number of green plants, especially algae. When it increases faster than the rate of degradation, eutrophication occurs. The constant death of algae will produce moldy odor; at the same time it will accelerate the corruption of the roots. Family hydroponic terrestrial flowers prone to root rot, expedient measures: First, do not place flowers on the balcony, avoid direct sunlight, reduce the level of oxygen breathing in roots, so as to avoid dissolved oxygen in nutrient solution drastically decreased due to the increase of oxygen consumption rate in the root system. Second, reduce the total concentration of nutrient solution, so that the conductivity is less than 0.6 millisiemens / cm (ms / cm); Third, the nutrient solution must not use ammonium nitrogen, and the use of chelating iron, manganese, zinc, copper; Fourth, increase nutrient solution and air contact surface area as much as possible to increase the rate of dissolved oxygen; Fifth, increase the frequency of replacement of nutrient solution, especially in the hot summer every day to replace the nutrient solution (reduced nutrient solution concentration), this is to improve the dissolved oxygen is beneficial of. The ultimate countermeasures for the occurrence of root rot in hydroponics: 1. Completely remove rot roots, use micro-submersible pumps (all standard aquarium tanks) to replenish the nutrient solution to increase dissolved oxygen in the nutrient solution; thoroughly remove rot roots and remove the flowers. Immediately transferred to earthless potted plants (pores with holes) using inorganic minerals such as vermiculite or agricultural rockwool and mineral wool as the matrix, the rhizosphere oxygen concentration can reach 1100000ppm-2100000ppm. At this time, all the root systems get sufficient oxygen and have strong Respiration.

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