Irrigation and fertilization are effective ways to regulate the growth of crops. The two are closely related and coordinated with each other or restrained. Irrigation can effectively promote the effect of fertilization, and fertilization effectively facilitates the absorption and utilization of water by crops. However, traditional irrigation and fertilization methods not only cause serious waste of water and fertilizer resources, but also reduce crop yields, quality and even bring environmental pollution and other problems, hindering the areas’ healthy development of agriculture and ecology, therefore, optimizing the coupling of water and fertilizer, scientific water use and efficient fertilization are of great significance for promoting the rational use of resources and intensive production in my country's agriculture. This article briefly showed the concept and characteristics of water-fertilizer integration technology and its respective effects on crop physiological growth, yield and quality. It also summarized the existing problems of current water-fertilizer integration technology in the process of agricultural extension and application, and greatly popularized water and fertilizer integration will require systematic theoretical research and technological innovation. Water and fertilizer integration technology is the optimal way to combine irrigation and fertilization, which is an inevitable choice for the advancement of modern agriculture.
Integration of water and fertilizer in pepper field under mulched drip irrigation is an integrated technology of irrigation and fertilization by synergistically coupling water, fertilizer, gas, heat and other factors to reduce water and fertilizer, improve water and fertilizer utilization, and increase production with high quality. It is an important support for realizing the requirements of modern precision agriculture, and it is also the focus of research in the field of agricultural engineering in recent years. This paper mainly introduced the development of water and fertilizer integration, the study of water and fertilizer coupling mechanism, the influence on crop growth characteristics and soil physical and chemical properties, and discussed the existing problems and suggestions of water and fertilizer integration technology under mulch drip irrigation.
The content of water resources affects the development of agriculture, ecology and economy. It is an inevitable requirement for sustainable development of society to realize the efficient utilization of water resources under the constraint of total amount. In our country, agricultural water resources are very limited and the water use efficiency is not high. Therefore, it is particularly important to pursue the efficient utilization of irrigation water resources for agricultural water with a large water consumption ratio. In order to realize the efficient utilization of irrigation water resources in Hexi Oasis area and further improve the economic benefits on seeds-production maize, this paper firstly introduced the research progress of regulated deficit irrigation under mulched drip irrigation, and then summarized the effects of regulated deficit irrigation under mulched drip irrigation on the growth, yield, quality and water use of seeds-production maize. The results showed that moderate water deficit at different growth stages on seeds-production maize could not only guarantee maize yield, but also improve grain quality, and significantly increase water use efficiency. Finally, the problems existing in the planting on seeds-production maize were analyzed, and the future research direction was prospected.
The Loess Plateau has become one of the most serious areas of soil erosion and the most fragile ecological environment in the world. Its natural environment determines the various types of soil erosion and its causes are complicated. This paper summarizes the previous studies, expounds the progress of soil and water conservation in the Loess Plateau area, and systematically summarizes the related measures of soil and water loss control in the Loess Plateau, including engineering control measures, biological control measures and tillage measures. At the same time, the problems existing in the present stage and the key research directions in the next stage are put forward in order to provide a theoretical basis for better protection and improvement of soil and water resources in the Loess Plateau.
Shortage of fresh water resources has become a global problem. Rational utilization of subsurface brackish water resources for agricultural irrigation was an effective way to ease the serious shortage of fresh water resources. This paper firstly introduces the background and irrigation methods of brackish water irrigation.Then it summarizes the effects on crop growth, yield, quality and soil of brackish water irrigation. It was suggested that further research on brackish water irrigation should be conducted in the following aspects: 1) establishing crop growth model; 2)establishing soil water and salt migration model, strengthening the simulation of long-term change process, while realizeing the scale transformation and long-term prediction of model; 3)strengthening vegetation protection and ecological restoration under brackish water irrigation. It provides guidance and help for the theory and practice of brackish water irrigation technology in the future.
As a large agricultural country, china agricultural water consumption accounts for about 70% of the national water consumption. In addition to the high water consumption of maize, exploring the regulation of water saving in maize under the severe water environment is important for stable and high yield of maize, reducing water consumption and improving water use efficiency.The normal growth and yield formation of crops are closely related to water content, the growth characteristics, physiological characteristics and water use efficiency of maize in different growth stages have different responses to regulated deficit irrigation. This paper mainly discussed the effects of regulated deficit irrigation on maize photosynthetic characteristics, water use efficiency and yield. The results indicated that excessive water deficit did not use the accumulation of photosynthetic products and dry matter of maize, resulting in a decrease in maize yield, while timeliness and proper amount water deficit could use photosynthesis to increase production and water use efficiency.
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