From the perspective of agricultural water-saving irrigation, the research and application of water-retaining agents started relatively late. With the modernization of agricultural production, the scientific application of water-retaining agents has become an important way to improve the efficiency of agricultural water use. Therefore, it is necessary to have an in-depth understanding of the application of water-retaining agents in water-saving irrigation, which has a very important impact on improving soil structure and increasing crop growth.
1 The effect of water retention agent
Through the actual application of water-retaining agent in water-saving irrigation, it can be seen that its water absorption capacity is directly related to the concentration of the solution. If the swelling degree of tap water is about 196 milliliters per gram, 80% of the water where the water-retaining agent is located can be used for Irrigated crops. Therefore, with the continuous increase in the research and development of water-retaining agents, the application of water-retaining agents in different regions must have a comprehensive understanding of the current situation of local agricultural production in order to ensure that the water-retaining agents play a real effect. Usually when the amount of water-retaining agent added to water is 0.6%, the available water in the soil is about 83%, and the water-retaining agent has better steam and moisture retention characteristics. If it evaporates under constant temperature conditions, it can greatly extend the sandy soil. The evaporation time will eventually increase the moisture content of the soil. In addition, in water-saving irrigation, the water-retaining agent can not only increase the soil moisture content, but also effectively increase the field water holding capacity and saturated water content, which plays an important role in ensuring the water required for crop growth.
2 Application of water retaining agent in water-saving irrigation
With the continuous expansion of the application range of water-retaining agents, its status in water-saving irrigation has become more and more important, especially with the massive consumption of global resources and energy. The water-saving effect of water-retaining agents must be fully utilized to truly promote the global agricultural economy sustainable development.
2.1 Climate and irrigation conditions
In many areas, the climate and irrigation conditions faced by agricultural production are very different. Therefore, the practical application of water-retaining agents also requires great attention to these factors in order to truly play the role of water-retaining agents. Under normal circumstances, for different climatic conditions and irrigation conditions, the amount of water-retaining agent, usage method and irrigation method are different. Among them, the more commonly used method is: the moisture content in the soil is relatively moderate, and the water retention ratio is appropriate It can effectively promote the growth of crop roots and the development of above-ground parts, which is an important foundation for water saving and yield increase. At the same time, use appropriate irrigation methods to avoid less water content in the soil, thereby increasing the soil moisture content, and increasing the viability and drought resistance of the crops by forming water competition with the crops through the water retaining agent. In addition, when choosing crops, try to choose varieties with strong cold resistance and ensure the depth of the water-retaining agent, so that the water-retaining agent can play its due role.
2.2 Irrigation amount
In the actual use of water retaining agent, if the amount of irrigation in the soil is relatively large, the water that can be retained in the soil planned wet layer will be more. At present, when crop yields are equivalent, applying 15 kg of water-retaining agent per square meter of soil per hour can save 544 cubic meters of water per square meter per hour. According to related studies, a water blocking layer of 20-40 cm is usually formed in the vertical section of the soil. If water-retaining agent is used for irrigation, the water content of this layer will be very high, but it will not affect the deep soil. The moisture content causes too much influence. For example, when irrigating corn, the reasonable application of water-retaining agent will not have a big impact on plant height, but it can promote the increase of corn leaf area and increase the growth rate of corn roots, thereby increasing the total yield of corn. It can be seen that the irrigation volume of the water-retaining agent is too small, which will have a certain impact on the growth of crops, and even reduce production. Therefore, it is necessary to reasonably determine the irrigation volume of the water-retaining agent according to the actual situation of crop planting in order to achieve the increase. The purpose of agricultural production.
2.3 Conditions of Use
In the process of continuous promotion of water-retaining agent, it is necessary to understand that water-retaining agent is only a biological agent that reduces water consumption, but it is not a water-generating agent. It needs a certain moisture condition to truly achieve the effect of water retention and ultimately save water. And the purpose of increasing production. Therefore, for the reasonable application of water-retaining agents in water-saving irrigation, one of the conditions that need to be paid attention to is that the soil must contain a certain amount of water. At the same time, the actual application effect of water-retaining agent requires comprehensive consideration of soil texture, application method, irrigation mode, water and fertilizer conditions, etc., in order to select the most suitable price of water-retaining agent, so as to ensure the appropriate dosage and reduce The application cost of water-retaining agent in water-saving irrigation has a great impact on improving the level of agricultural economy.
In summary, on the issue of sustainable agricultural development, focusing on the most effective use of water and improving water-saving irrigation technology are very important basic conditions. Therefore, giving full play to the role of water-retaining agents and increasing the promotion of the rational application of water-retaining agents in water-saving irrigation are of great significance for improving the level of agricultural economy and reducing water waste.