Nutrient solution management technology
Nutrient solution is the core part of soilless cultivation. From the time of preparation until it is absorbed by plants, how to finely manage the whole growth process of tomato is very important. The modern nutrition management in the Netherlands is the guarantee of high yield of tomato.
Nutritional Liquid Formula Management
The amount of inorganic elements absorbed by tomato differs depending on the variety and the stage of growth, so it should be managed according to the tomato variety, growth stage, and cultivation season. The Dutch tomato is generally a bunched variety, which is planted in December and lasts until December of the following year. It basically maintains a year's growing time. Like this kind of long-season growing crop, the formula needs to be adjusted in time according to the crop condition. The Dutch tomato is produced weekly. A nutrient solution is formulated by a professional company based on the growth of the tomato and the test value of the fluid.
Nutrient solution concentration management
The management of nutrient solution concentration directly affects the yield and quality of plants, and the management indicators of different plant nutrient solutions are different, and the nutrient solution concentration management of the same plant at different growth periods is also not the same. The concentration of nutrient solution in different seasons is also slightly different. Generally, the concentration of nutrient solution used in summer is slightly lower than that in winter, but there are also individual plant concentration management practices. Tomato soilless cultivation of high-concentration management than the low-concentration management of fruit sugar.
Redharvest's nutrient concentration is generally controlled at 70%, and it will be adjusted in time according to different growth periods and greenhouse conditions. At the same time, there are special people to observe the plant growth in real time to see if there are signs of physical disease, and if there is a lack of elements or excess physiological disease, immediate remedial measures will be taken.
Nutrient solution pH management
The pH of the nutrient solution is generally maintained at the optimum pH range, especially hydroponic, and the pH value is more stringent. Because all kinds of fertilizer components are dissolved in nutrient solution in an ionic state, the pH level will directly affect the solubility of various fertilizers, thus affecting plant absorption. Especially in alkaline conditions, it will directly affect the absorption of metal ions and cause physiological diseases of nutrient deficiency. Taking Redharvest as an example, pH accuracy is strictly controlled from the mother liquor to the irrigation solution. When the mother liquor is configured, A and B tanks are equipped with two pH testing instruments, respectively. The pH value of A tank can be adjusted by adding acid or addition and subtraction. Between 5.7-6, B tank pH is between 2.7-3.
EC value control of nutrient solution
The EC value is used to measure the soluble salt concentration in the solution. It can also be used to measure the concentration of soluble ions in liquid manure or planting media. High concentrations of soluble salts can cause damage to plants or death of plant roots, so the EC value is a key factor in the formulation of nutrient solutions. Generally, the nutrient solution in soil cultivation is between 0.8 and 2.5. EC in soilless cultivation medium EC The value is generally controlled at 0.5-7ms/cm. Redharvest tomato production is through various fertilizers. The EC value is basically controlled at 3-5ms/cm. The EC value of each growth stage is different and will be based on the plant growth and liquid return value. Timely adjustments.
Liquid supply method and frequency management
Dutch tomatoes are usually planted on rockwool blocks and are often fed intermittently so that they can be forced to circulate and increase the amount of dissolved oxygen in the nutrient solution to meet the oxygen needs of the root. Generally, the number of times of daily fluid supply and the time of each supply must be determined according to the season, weather, seedling age, and growth period. The nutrient solution application of Redharvest Company is controlled by the professional management system produced by Priva Corporation. The specific daily application quantity and time are monitored by the system in real time. The conditions of light intensity and time interval are set in the system to meet the requirements of one and ensure nutrition. The liquid is supplied on demand. Normally, fertilization is started at 8:30 and water is applied every 20 minutes. Each drop of arrowhead absorbs about 200 ml of nutrient solution, and the total amount is about 7 liters/square meter per day.
Nutritional fluid supplements and updates
Because in the process of circulating fluids, the nutrient solution is absorbed and consumed by the plants once a week, and the liquid volume will continuously decrease. If the amount of fluid to be returned is less than 1 day, it is necessary to add supplements in order to avoid the slow growth of plants or the occurrence of physiological diseases. Generally, after the nutrient solution is used continuously for two months, a full or half quantity update is performed.
Disinfection of nutrient solution
Although the soilless cultivation rhizosphere disease is less than that of soil culture, some pathogens on the ground will be transmitted through the air, water, and the devices and instruments used, especially if the nutrient solution is recycled, if there is a diseased plant on the cultivation bed, There is a risk of infecting the entire cultivation bed with a nutrient solution, and the quality of the water has a great influence on the EC value and the pH value of the nutrient solution. Therefore, the used nutrient solution needs to be disinfected. There are many kinds of disinfection methods, such as high-temperature heat treatment, ultraviolet disinfection, and ozone disinfection.
A greenhouse(also called hothouse)is a building or complex in which allow for greater control over the growing environment of plants. Depending upon the technical specification of a greenhouse, key factors which may be controlled include temperature, levels of light and shade, irrigation, fertilizer application, and atmospheric humidity. Greenhouse may be used to overcome shortcomings in the growing qualities of a piece of land, such as a short growing season or poor light levels, greenhouses are often used for growing flowers, vegetables, fruits, transplants and seedlings. Greenhouses can be divided into glass greenhouses and plastic greenhouses. Plastics mostly used are polyethylene film and multiwall sheets of polycarbonate material, or PMMA acrylic glass. Commercial glass greenhouse are often high-tech production facilities for vegetables or flowers. The glass greenhouse are filled with equipment such as screening installations, heating, cooling and lighting, and may be automatically controlled by a computer.
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