Soilless culture as the name suggests, is not the direct use of soil, nutrition to cultivated plants, the planting pattern can effectively control the crop during the growth and development of temperature, moisture, light, nutrient and air the best requirement. Because there is no soil, can enlarge planting area, accelerate crop growth, improve the quality of the vegetables, saving water and labor, is one of the world's most advanced cultivation techniques, a lot of soilless cultivation methods, production at present are mainly used aeroponics, soilless culture and hydroponics.
Soilless cultivation methods are many, various forms, then for our greenhouse vegetable production what reference place?
First, find a way out for increasingly serious soil problems.
As the vegetables in the soil planting more and more long, a large area of fertilizer and pesticide use to soil environment worsening, salinization, soil compaction, high incidence of pests and diseases and other problems, many farmers have reacted into more and more high, the output is not improved, even in decline. And soilless culture to alleviate this situation pointed out the direction. Due to years of continuous cropping, root rot, bacterial pith necrosis and other diseases are more and more serious, and even the whole studio, losing a lot of farmers. Although using high temperature disinfection and fumigation and soil biological bacterial fertilizer to control soil borne disease, but can be used if the soilless culture can avoid this problem. Through the nutrient or substrate cultivation, not only can directly see the growth of the root, take precautions, to prevent root diseases and insect pests, but also to meet food safety requirements. Especially in saline soil or soil under severe pollution, soilless culture will continue to produce the most viable road.
Secondly, in the true sense, according to the law of fertilizer application.
Soilless culture according to different growth stages of crops to provide the corresponding nutrients, both to ensure that crops can “ eat ” and ensure that no waste. In our greenhouses, farmers without soil testing and fertilizer, leading to some elements in soil and the accumulation of excess, but lack of absorption of some elements. As in recent years, vegetable planting area of vegetable in a lot of results the use of potash fertilizer and ammonia decreased, resulting in soil potassium excess, which brings a series of problems, such as inhibition of calcium and magnesium in soil absorption, a long time, many farmers only pay attention to large amount of nitrogen, phosphorus and potassium in soil recharge, will cause the soil nutrient imbalance, especially in continuous cropping of vegetable, soil nutrient imbalance problem is more serious. In addition, vegetables of different types, different growth period, the soil is different, if farmers do not need fertilizer of vegetable fertilization in accordance with the law, when a certain element deficiency or excess, vegetable physiology can produce an obstacle, which is one reason why deficiency, premature senility, leaves physiological problems frequently occurring.
Fertilization must adhere to what the principle of lack of fill, not too much or too little. Farmers in the basic fertilizer should pay attention to the increased use of trace elements of calcium and magnesium fertilizer in base fertilizer, in addition to do, but also pay attention to prevent the occurrence of leaf vegetables, navel rot physiological disease.
