Abstract: Various agricultural measures significantly affect the physical properties of soil, especially the hydraulic parameters of soil. With the wide application of computer model in soil material movement prediction, it has become an important research task to accurately determine soil hydraulic parameters. Record ... With the application of disc infiltrator, researchers hope to obtain soil hydraulic parameters through back calculation. The reverse order method is relatively straight. ...
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Management of Online-Online Publication of Scientific Papers in China
Research progress on determination of soil hydraulic parameters by disc infiltrator. Various agricultural measures significantly affect soil physical properties, especially soil hydraulic parameters. With the wide application of computer model in soil material movement prediction, it has become an important research task to accurately determine soil hydraulic parameters. As a simple and practical method, disc permeameter is widely used to determine the hydraulic conductivity parameters of field soil. ...
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Simulation study on farmland water balance considering dynamic parameters of soil hydraulics
Although the model can reproduce the real soil water system, in order to improve the simulation accuracy, soil hydrodynamic parameters must be considered. Subsoiling tillage obviously changed the hydraulic characteristics of the surface soil, and the simulation results based on dynamic parameters were significantly different from those of traditional tillage. Because the change of soil hydraulic parameters in farming area is not sensitive to no-tillage method, ...
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In this paper, the hydraulic characteristic parameters of heterogeneous layered soil are determined by indoor and outdoor tests and soil transfer function ... The results show that the soil hydraulic parameters measured by field test method have high accuracy and can be used to simulate the distribution profile of soil water content in field drainage test. Parameters estimated by indoor test method and soil transfer function ...
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Zheng Jiyong, Research Center of Soil and Water Conservation of China Academy of Sciences, won the Outstanding Academic Report Award of the 9th National Green Soil Society.
In his academic report, Zheng Jiyong introduced the spatial distribution characteristics and spatial variation model of soil hydraulic parameters and soil chemical properties in small watershed scale, in which the spatial variation of soil physical and chemical properties in small watershed scale was studied, which aroused great interest and aroused extensive and heated discussion. ...
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... span class =' class1' > spatial distribution and spatial variation model of soil hydraulic parameters (saturated water content, stagnant water content, van Genutchen water-holding characteristic model parameters α and N) and soil chemical properties (nitrate nitrogen, ammonium nitrogen, available phosphorus, available potassium, organic matter, total nitrogen, total phosphorus and total potassium) ... ......
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A simple method for estimating soil moisture characteristic curve
File format: Adobe Acrobat
Because the hydraulic properties of the basic soil model are determined by the soil structure, especially the spatial distribution of soil pores, some foreign scholars have made many meaningful attempts to obtain the soil moisture movement and dynamic parameters more conveniently, and gradually developed a simple indirect method-soil transfer function. ...
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three
Unsaturated hydraulic conductivity of soil moisture is an important parameter in soil moisture research and a key measurement item in soil moisture quantitative research. In the study of water balance, unsaturated hydraulic conductivity is a necessary parameter for calculating soil infiltration, groundwater recharge and seepage measurement. ... can be used to study the hydraulic characteristics of soil capillary seepage. Each set of equipment can measure five samples in a batch. ...
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[DOC] Optimizing the combination of technical parameters of surface irrigation to improve the utilization rate of water and fertilizer (Abstract)
File format: Microsoft Word
Reasonable fertilization and irrigation system is the key to reduce non-point source pollution, and studying the influence of technical parameters of surface irrigation on temporal and spatial distribution and leaching loss of soil nitrogen is the basis of formulating reasonable fertilization and irrigation system. Familiar with the new development of spray and drip irrigation technology at home and abroad, systematically studied the design standard of uniformity coefficient of sprinkler irrigation, hydraulic problems of sprinkler irrigation and nitrogen migration law of drip irrigation. ...
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China public science and technology network
Effects of different irrigation amount and different drip irrigation hole flow rate on soil water and nutrient migration and distribution and crop water and nutrient utilization efficiency; In order to improve the utilization efficiency of crop water and nutrients and reduce groundwater pollution, the optimal combination of irrigation technical parameters under different water-saving irrigation standards and the determination method of farmland salt washing water quota are put forward. ...
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