The biggest advantage of a plant factory is that the environment is controllable, which enables agriculture to get rid of the restrictions of the region and the natural environment, and achieve high yield and high quality of agricultural production. The controllable environment includes environmental factors such as light, temperature, and gas, as well as moisture and temperature. nutrition. Today we will discuss the regulation of water and nutrition in plant factories.
Origin of the hydroponic system:
Hydroponics technology is mostly used in plant factories, which is one of the core technologies of plant factories. Hydroponic cultivation, also known as nutrient solution cultivation, is a cultivation technique that makes nutrients needed for plant growth into nutrient solutions for plant absorption. No soil is needed, and the root system of plants grows in nutrient solutions.
The earliest recorded in the history of proposing hydroponics without planting plants in soil was the English Renaissance essayist and philosopher, Francis Bacon. He not only made significant contributions in the history of philosophical development. Engels was called "the first founder of British materialism". Bacon was also a pioneer of experimental science. Until his death, he was still experimenting with the effect of freezing on the preservation of meat. One year after Bacon's death, in 1627, his theory of hydroponic plants was published, and people began to pay attention to hydroponic technology.Since then, after experimental research by scientists, it has been found that distilled pure water cannot meet the needs of plant growth, and the solution containing specific nutrient elements is the key. Therefore, people call the technology of plant growth with a solution containing mineral nutrients called "solution "Cultivation" (solutionculture), this technology quickly became a research hotspot; today, we call this solution cultivation hydroponic cultivation. Hydroponics are derived from Greek, which means that the soil is replaced by water during agricultural cultivation.
Why is the indoor hydroponic system so popular?
Since the hydroponic cultivation technology was proposed, relevant academic research and technological innovation have continued, so far it has received widespread attention, because hydroponic cultivation has obvious advantages.
First let's see how the nutrient solution is used by plants. Water is absorbed by the roots and transported to various parts of the plant through the xylem of the rhizome. Part of the water is used for plant growth, and most of it is evacuated through the leaf stomata. Water absorption and transpiration form the water cycle of the plant body; the transport of mineral nutrients depends on the transport of water and flows into all parts of the plant. Therefore, the root system is the most important source of water and nutrients for the plant. Therefore, the external environment of the root system is close Affects the plant's absorption of water and nutrients.
The main source of water and nutrients, therefore, the external environment of the root system closely affects the absorption of water and nutrients by plants.
Water is absorbed by the plant roots, transported to the leaves through the xylem duct, and transpiration from the stomata on the surface of the leaves into the atmosphere. The nutrient solution can provide plants with a steady stream of water and nutrients. This is the difference from crude tea to rice and buffet meals for plants that originally depended on soil moisture and mineral nutrients for survival. Therefore, the growth rate of plants growing in the nutrient solution is much higher than that of the plants growing in the soil, and the artificially controllable nutrition supply improves the product quality.
Without the soil containing various harmful bacteria, hydroponic cultivation avoids a large part of plant diseases and greatly reduces the need for spraying pesticides. Vegetables in plant factories are safe and pollution-free high-quality products.
At the same time, hydroponic cultivation is convenient for automatic operation, saves manpower, and can even achieve the effect of saving water and fertilizer. Taking the Yida Fruit and Vegetable Factory in Central as an example, the hydroponic cultivation technology was adopted to integrate irrigation and fertilization. With the help of pressure system and EC / pH sensor, the liquid fertilizer mother liquor was mixed with water and fertilizer according to the type of crops and fertilizer characteristics. According to the conditions such as temperature, humidity, and light intensity provided by the intelligent greenhouse, automatic intelligent adjustment is performed to realize the quantitative, regular, and proportional supply of water and nutrients during the full growth period, effectively control the amount of irrigation water and fertilization, and achieve scientific planting and increase water and fertilizer The effect of utilization. At the same time, by recycling, sterilizing and reusing the surplus water for irrigation, it can achieve a 50% fertilizer saving rate and a water saving rate of up to 90%.