What is modern greenhouse agriculture? Why should water-fertilizer integrated irrigation be developed in greenhouse agriculture?

Greenhouse Agriculture is the most important indoor vegetable planting mode in the field of vegetable cultivation in the 21st century. The development of greenhouse agriculture is completely different from the traditional agriculture, which is managed under natural conditions by man-power and simple iron, and can only be self-sufficient. Greenhouse Agriculture uses a variety of science and technology to control greenhouse environmental factors such as nutrients, water, concentration, and light intensity needed by crops in the greenhouse, the economic benefits are also considerable, these traditional agriculture can not be achieved.

Among them, nutrient and water are the key environmental factors affecting high yield, high quality and high efficiency of greenhouse crops. Studies at home and abroad have shown that the increase in crop yields, the role of fertilizers, which shows that the control of crop nutrients is most important, and crop nutrient absorption in the water environment is the best, that is, water and fertilizer supply is the best way for greenhouse crops to absorb nutrients, which not only provides water, but also absorbs nutrients, making the greenhouse crops get the best economic benefits. So it is very important to adjust the balanced supply of water and fertilizer reasonably in order to make the crops have the maximum growth potential. So why do we want to develop water-saving agriculture? 1. China's per capita water resources are very small, not borrow per capita in time, the world is one of the artificial water-poor countries. However, China is a big water-using country in the world, especially for agriculture. Many places can not meet the agricultural demand, which makes the water resources in the northwest and North China more scarce. 2. At the same time, from the angle of fertilizer utilization rate, our country is also a big country of fertilizer production and consumption in the world. Take the situation of chemical fertilizer use in our country in the past year for example, the utilization rate of nitrogen fertilizer, the utilization rate of phosphorus fertilizer, and the utilization rate of potassium fertilizer were not as high as that of the previous year. The phenomenon of unreasonable use of chemical fertilizer is widespread in our country, the increasing use of chemical fertilizer has not brought significant increase in grain yield, consuming a lot of material and financial resources, but can not obtain the maximum economic benefits.

On the other hand, the heavy use of chemical fertilizer can also change the nature of the soil, resulting in soil compaction, can not give crops to absorb nutrients to provide a good looser external conditions. Nutrient loss is very serious, crops are not well absorbed, rain into the surface water, causing groundwater pollution in many places, the lake plant eutrophication is serious. Therefore, we must develop water-saving, fertilizer-saving irrigation methods.