Static hydroponic flowers commonly introduced in the market, according to the root oxygen supply, one is to use dissolved oxygen in the nutrient solution; the second is to receive oxygen directly from the air. The former is the root tip immersed in the nutrient solution, and the oxygen is naturally dissolved by the contact of the liquid surface and the air; the latter is the upper end of the root, that is, the local root is exposed to the air and directly absorbs oxygen.
The root of the flower is exposed to the air, and its root is directly in an environment with an oxygen concentration of 2.3×100,000 ppm (oxygen in air is about 21% by volume); the root of the flower root is planted in water, and the rhizosphere oxygen concentration drops sharply, and Limited by the amount of saturated oxygen (<15ppm) in water. The oxygen concentration difference between the two is 10,000 times.
At a certain temperature and pressure, the maximum amount of dissolved oxygen in the water is called the saturated dissolved amount of oxygen. Oxygen (O2) dissolved in water has different saturated and dissolved amounts of oxygen at different pressures and temperatures.
The family hydroponic flower, due to the fact that the tip of the root is in the nutrient solution, the average dissolved oxygen concentration through the water surface is about 4%-8% of the saturated dissolved amount of oxygen. For example, in the case where 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 plants are hydroponic, the dissolved oxygen content in the rhizosphere is 2.8ppm or less, and the upper leaves begin to wilting; the dissolved oxygen in the rhizosphere is less than 1.5ppm, the roots are rapidly deteriorated, and the growth is difficult; the dissolved oxygen in the rhizosphere is 0.5ppm or less. At the time, the root system almost stopped growing or died (rot). The dissolved oxygen in hydroponic water is extremely low, and the oxygen in the roots is extremely difficult to breathe, which has been reduced to the critical standard (0.5 ppm) for the death or death of terrestrial plants. It is emphasized here that even if a part of the root of the flower is directly exposed to the air, it cannot change the dangerous state of oxygen respiratory failure at the tip end of the root system in the nutrient solution, that is, it is difficult to get rid of the bad consequences of "dead water will rot"; Not rot, but at most it is to prolong the remnant and maintain the life of the plant. The "water root" is the rootless root, which is inevitably far less than the growth situation in the soil pot.
Some static hydroponic flowers, the roots are planted in transparent glassware, which can also cause the 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 green plants, especially algae. Eutrophication occurs when the rate of increase exceeds the rate of degradation. The continuous death of algae will produce a mild smell; at the same time accelerate the corruption of the roots.
Family hydroponic terrestrial flowers are prone to root rot, expedient countermeasures: First, do not place flowers on the balcony, avoid direct sunlight, reduce the level of oxygen respiration in the roots, so as to prevent the dissolved oxygen in the nutrient solution from drastically decreasing due to the increase of the oxygen consumption rate of the roots. Second, reduce the total concentration of nutrient solution, so that the conductivity is less than 0.6 millisiemens / cm (ms / cm); Third, do not use ammonium nitrogen in the nutrient solution, and use chelated iron, manganese, zinc, copper; Fourth, increase the contact surface area of ​​nutrient solution and air as much as possible to increase the rate of dissolved oxygen; 5. Increase the frequency of replacement of nutrient solution, especially in the hot summer, change the nutrient solution every day (reducing the concentration of nutrient solution), which is beneficial to increase dissolved oxygen. of.
The ultimate countermeasures for root rot in hydroponics: First, thoroughly remove the roots, use micro-submersible pumps (both aquarium standard products) to pour the nutrient solution to improve the dissolved oxygen in the nutrient solution; thoroughly remove the roots and flowers Immediately transferred to a soilless potted plant (porous pelvic hole) with mineral ore and mineral wool as the matrix, the rhizosphere oxygen concentration can reach 1×100000ppm-2×100000ppm, and all the roots are sufficient. Oxygen has a strong breathing effect.
The root of the flower is exposed to the air, and its root is directly in an environment with an oxygen concentration of 2.3×100,000 ppm (oxygen in air is about 21% by volume); the root of the flower root is planted in water, and the rhizosphere oxygen concentration drops sharply, and Limited by the amount of saturated oxygen (<15ppm) in water. The oxygen concentration difference between the two is 10,000 times.
At a certain temperature and pressure, the maximum amount of dissolved oxygen in the water is called the saturated dissolved amount of oxygen. Oxygen (O2) dissolved in water has different saturated and dissolved amounts of oxygen at different pressures and temperatures.
The family hydroponic flower, due to the fact that the tip of the root is in the nutrient solution, the average dissolved oxygen concentration through the water surface is about 4%-8% of the saturated dissolved amount of oxygen. For example, in the case where 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 plants are hydroponic, the dissolved oxygen content in the rhizosphere is 2.8ppm or less, and the upper leaves begin to wilting; the dissolved oxygen in the rhizosphere is less than 1.5ppm, the roots are rapidly deteriorated, and the growth is difficult; the dissolved oxygen in the rhizosphere is 0.5ppm or less. At the time, the root system almost stopped growing or died (rot). The dissolved oxygen in hydroponic water is extremely low, and the oxygen in the roots is extremely difficult to breathe, which has been reduced to the critical standard (0.5 ppm) for the death or death of terrestrial plants. It is emphasized here that even if a part of the root of the flower is directly exposed to the air, it cannot change the dangerous state of oxygen respiratory failure at the tip end of the root system in the nutrient solution, that is, it is difficult to get rid of the bad consequences of "dead water will rot"; Not rot, but at most it is to prolong the remnant and maintain the life of the plant. The "water root" is the rootless root, which is inevitably far less than the growth situation in the soil pot.
Some static hydroponic flowers, the roots are planted in transparent glassware, which can also cause the 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 green plants, especially algae. Eutrophication occurs when the rate of increase exceeds the rate of degradation. The continuous death of algae will produce a mild smell; at the same time accelerate the corruption of the roots.
Family hydroponic terrestrial flowers are prone to root rot, expedient countermeasures: First, do not place flowers on the balcony, avoid direct sunlight, reduce the level of oxygen respiration in the roots, so as to prevent the dissolved oxygen in the nutrient solution from drastically decreasing due to the increase of the oxygen consumption rate of the roots. Second, reduce the total concentration of nutrient solution, so that the conductivity is less than 0.6 millisiemens / cm (ms / cm); Third, do not use ammonium nitrogen in the nutrient solution, and use chelated iron, manganese, zinc, copper; Fourth, increase the contact surface area of ​​nutrient solution and air as much as possible to increase the rate of dissolved oxygen; 5. Increase the frequency of replacement of nutrient solution, especially in the hot summer, change the nutrient solution every day (reducing the concentration of nutrient solution), which is beneficial to increase dissolved oxygen. of.
The ultimate countermeasures for root rot in hydroponics: First, thoroughly remove the roots, use micro-submersible pumps (both aquarium standard products) to pour the nutrient solution to improve the dissolved oxygen in the nutrient solution; thoroughly remove the roots and flowers Immediately transferred to a soilless potted plant (porous pelvic hole) with mineral ore and mineral wool as the matrix, the rhizosphere oxygen concentration can reach 1×100000ppm-2×100000ppm, and all the roots are sufficient. Oxygen has a strong breathing effect.
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