Prevention and Control Methods for Root Rot in Household Hydroponic Flowers
In the static hydroponic flowers commonly introduced on the market, there are two pathways for oxygen supply to the roots: one is utilizing dissolved oxygen in the nutrient solution; the other is absorbing oxygen directly from the air. In the former, the root tips are immersed in the nutrient solution, and oxygen naturally dissolves through contact between the liquid surface and the air; in the latter, the upper portion of the roots
In the static hydroponic flowers commonly introduced on the market, there are two pathways for oxygen supply to the roots: one is utilizing dissolved oxygen in the nutrient solution; the other is absorbing oxygen directly from the air. In the former, the root tips are immersed in the nutrient solution, and oxygen naturally dissolves through contact between the liquid surface and the air; in the latter, the upper portion of the roots, that is, part of the root system, is exposed to the air and absorbs oxygen directly.
The portion of the flower root system exposed to the air is directly in an environment with an oxygen concentration of 2.3×100000ppm (oxygen makes up about 21% of air by volume); when the root tips of the flowers are planted into water, the oxygen concentration in the root zone drops sharply and is limited by the saturation solubility of oxygen in water (<15ppm)的限制。两者氧浓度落差达10000倍。在一定温度和压力下，水中所溶解的氧已达最大量称为氧的饱和溶解量。溶于水中的氧(o2)在不同气压、不同温度下，氧的饱和溶解量是不同的。
In household hydroponic flowers, because the root tip portion is in the nutrient solution, the oxygen concentration naturally dissolved through the water surface averages about 4%-8% of the saturation solubility of oxygen. For example, at a liquid temperature of 20°C, the dissolved oxygen in the hydroponic solution is only about 0.37ppm-0.74ppm. For most terrestrial plants in hydroponics, when the dissolved oxygen content in the root zone is below 2.8ppm, the upper leaves begin to wilt; when the dissolved oxygen in the root zone falls below 1.5ppm, root respiration rapidly deteriorates and growth becomes difficult; when the dissolved oxygen in the root zone is below 0.5ppm, the root system almost stops growing or dies (rots).
Prevention and Control of Root Rot in Household Hydroponic Terrestrial Flowers
In the static hydroponic flowers commonly introduced on the market, there are two pathways for oxygen supply to the roots: one is utilizing dissolved oxygen in the nutrient solution; the other is absorbing oxygen directly from the air. In the former, the root tips are immersed in the nutrient solution, and oxygen naturally dissolves through contact between the liquid surface and the air; in the latter, the upper portion of the roots, that is, part of the root system, is exposed to the air and absorbs oxygen directly.The portion of the flower root system exposed to the air is directly in an environment with an oxygen concentration of 2.3×100000ppm (oxygen makes up about 21% of air by volume); when the root tips of the flowers are planted into water, the oxygen concentration in the root zone drops sharply and is limited by the saturation solubility of oxygen in water (<15ppm)的限制。两者氧浓度落差达10000倍。在一定温度和压力下，水中所溶解的氧已达最大量称为氧的饱和溶解量。溶于水中的氧(O2)在不同气压、不同温度下，氧的饱和溶解量是不同的。
In household hydroponic flowers, because the root tip portion is in the nutrient solution, the oxygen concentration naturally dissolved through the water surface averages about 4%-8% of the saturation solubility of oxygen. For example, at a liquid temperature of 20°C, the dissolved oxygen in the hydroponic solution is only about 0.37ppm-0.74ppm. For most terrestrial plants in hydroponics, when the dissolved oxygen content in the root zone is below 2.8ppm, the upper leaves begin to wilt; when the dissolved oxygen in the root zone falls below 1.5ppm, root respiration rapidly deteriorates and growth becomes difficult; when the dissolved oxygen in the root zone is below 0.5ppm, the root system almost stops growing or dies (rots).
The dissolved oxygen in hydroponic water is extremely low, making root oxygen respiration extremely difficult, and it has dropped to the critical threshold (0.5ppm) at which the life of ordinary terrestrial plants stops or they die. It should be emphasized here that even if part of the flower's roots is directly exposed to the air, it cannot change the dangerous state of oxygen respiration failure in the root tip portion that remains soaked in the nutrient solution for a long time; in other words, it is difficult to escape the severe consequence that "stagnant water must rot"; if the roots fortunately do not rot, it is at most a lingering existence that merely sustains the plant's life, and the "water roots," that is, roots without root hairs, are inevitably far inferior to the growth condition in soil pot culture. In some static hydroponic flowers, the roots are planted in transparent glass containers, and in the nutrient solution this can also cause the light reaction of carbon dioxide.
The presence of trace nutrients such as phosphorus and nitrogen in the water will promote synthesis reactions and increase green plants, especially algae. When their rate of increase exceeds their rate of degradation, eutrophication occurs. The continuous death of algae produces a musty odor; at the same time, it accelerates root rot.
Household hydroponic terrestrial flowers are prone to root rot; expedient countermeasures:
1. Never place the flowers on a balcony, avoid direct sunlight, and lower the level of root oxygen respiration, so as to prevent the dissolved oxygen in the nutrient solution from dropping sharply due to an increase in the root oxygen consumption rate;
2. Lower the total concentration of the nutrient solution so that the electrical conductivity is below 0.6 millisiemens per centimeter (ms/cm);
3. Never use ammonium nitrogen in the nutrient solution, and use chelated iron, manganese, zinc, and copper;
4. Increase the contact surface area between the nutrient solution and air as much as possible to increase the rate of oxygen dissolution;
5. Increase the frequency of replacing the nutrient solution, especially in hot summer, replacing the nutrient solution once a day (lowering the nutrient solution concentration); this is beneficial for increasing dissolved oxygen.
Ultimate countermeasures for root rot in hydroponics:
Thoroughly remove the rotten roots, use a miniature submersible pump (all standard aquarium products) to aerate the nutrient solution in order to increase the dissolved oxygen in the nutrient solution; thoroughly remove the rotten roots, and immediately transfer the flowers to soilless pot culture using vermiculite or agricultural rock wool and other inorganic minerals or mineral wool as the substrate (with holes in the bottom of the pot); the oxygen concentration in the root zone can reach 1×100000ppm-2×100000ppm. At this time, all roots obtain sufficient oxygen and have vigorous respiration.
Household Hydroponic Terrestrial Flowers Are Prone to Root Rot
In the static hydroponic flowers commonly introduced on the market, there are two pathways for oxygen supply to the roots: one is utilizing dissolved oxygen in the nutrient solution; the other is absorbing oxygen directly from the air. In the former, the root tips are immersed in the nutrient solution, and oxygen naturally dissolves through contact between the liquid surface and the air; in the latter, the upper portion of the roots, that is, part of the root system, is exposed to the air and absorbs oxygen directly.The portion of the flower root system exposed to the air is directly in an environment with an oxygen concentration of 2.3×100000ppm (oxygen makes up about 21% of air by volume); when the root tips of the flowers are planted into water, the oxygen concentration in the root zone drops sharply and is limited by the saturation solubility of oxygen in water (＜15ppm). The difference in oxygen concentration between the two reaches 10000 times.
Under a certain temperature and pressure, the amount of oxygen dissolved in water having reached its maximum is called the saturation solubility of oxygen. For oxygen (O2) dissolved in water, the saturation solubility of oxygen differs under different air pressures and different temperatures.
In household hydroponic flowers, because the root tip portion is in the nutrient solution, the oxygen concentration naturally dissolved through the water surface averages about 4%-8% of the saturation solubility of oxygen. For example, at a liquid temperature of 20°C, the dissolved oxygen in the hydroponic solution is only about 0.37ppm-0.74ppm.
For most terrestrial plants in hydroponics, when the dissolved oxygen content in the root zone is below 2.8ppm, the upper leaves begin to wilt; when the dissolved oxygen in the root zone falls below 1.5ppm, root respiration rapidly deteriorates and growth becomes difficult; when the dissolved oxygen in the root zone is below 0.5ppm, the root system almost stops growing or dies (rots). The dissolved oxygen in hydroponic water is extremely low, making root oxygen respiration extremely difficult, and it has dropped to the critical threshold (0.5ppm) at which the life of ordinary terrestrial plants stops or they die. It should be emphasized here that even if part of the flower's roots is directly exposed to the air, it cannot change the dangerous state of oxygen respiration failure in the root tip portion that remains soaked in the nutrient solution for a long time; in other words, it is difficult to escape the severe consequence that "stagnant water must rot"; if the roots fortunately do not rot, it is at most a lingering existence that merely sustains the plant's life, and the "water roots," that is, roots without root hairs, are inevitably far inferior to the growth condition in soil pot culture.
In some static hydroponic flowers, the roots are planted in transparent glass containers, and in the nutrient solution this can also cause the light reaction of carbon dioxide. The presence of trace nutrients such as phosphorus and nitrogen in the water will promote synthesis reactions and increase green plants, especially algae. When their rate of increase exceeds their rate of degradation, eutrophication occurs. The continuous death of algae produces a musty odor; at the same time, it accelerates root rot.
Household hydroponic terrestrial flowers are prone to root rot; expedient countermeasures: 1. Never place the flowers on a balcony, avoid direct sunlight, and lower the level of root oxygen respiration, so as to prevent the dissolved oxygen in the nutrient solution from dropping sharply due to an increase in the root oxygen consumption rate; 2. Lower the total concentration of the nutrient solution so that the electrical conductivity is below 0.6 millisiemens per centimeter (ms/cm); 3. Never use ammonium nitrogen in the nutrient solution, and use chelated iron, manganese, zinc, and copper; 4. Increase the contact surface area between the nutrient solution and air as much as possible to increase the rate of oxygen dissolution; 5. Increase the frequency of replacing the nutrient solution, especially in hot summer, replacing the nutrient solution once a day (lowering the nutrient solution concentration); this is beneficial for increasing dissolved oxygen.
Ultimate countermeasures for root rot in hydroponics: 1. Thoroughly remove the rotten roots, use a miniature submersible pump (all standard aquarium products) to aerate the nutrient solution in order to increase the dissolved oxygen in the nutrient solution; thoroughly remove the rotten roots, and immediately transfer the flowers to soilless pot culture using vermiculite or agricultural rock wool and other inorganic minerals or mineral wool as the substrate (with holes in the bottom of the pot); the oxygen concentration in the root zone can reach 1×100000ppm-2×100000ppm. At this time, all roots obtain sufficient oxygen and have vigorous respiration.