Infiltration water and inorganic solute global distribution test method under micro-spraying irrigation condition

Abstract

The invention discloses an infiltration water and inorganic solute global distribution test method under a micro-spraying irrigation condition. The method comprises the following steps: arranging a test area, and measuring physical and hydrodynamic parameter properties of soil; dissolving an inorganic solute solution in water to serve as a tracer agent, and carrying out a micro-spraying experimentin a test area; preparing a cresol red-methylene blue mixed color developing solution; after 24-48 hours, digging out an area which is not sprayed, forming a section layer by layer along the axis direction, and measuring the soil moisture content at different positions and different depths and the concentration distribution of a color developing area; determining the soil moisture content variation of the color developing area according to the measured soil moisture content, and determining the satisfaction degree of spray irrigation water and inorganic solute redistribution on irrigation requirements according to the variation of the moisture content and the concentration distribution of the color developing area at different depth positions. According to the method, the micro-spraying irrigation efficiency can be systematically evaluated by measuring the redistribution of water and inorganic solutes under the condition of micro-spraying irrigation; and a basis is provided for improving the micro-spraying irrigation level and realizing precise agricultural water.

Description

technical field [0001] The invention belongs to the technical field of soil water infiltration distribution, and in particular relates to a method for testing the global distribution of infiltration water and inorganic solute under the condition of micro-spray irrigation. Background technique [0002] The evaluation indicators of irrigation efficiency, such as the effective utilization rate of field irrigation, the effective utilization rate of field irrigation storage, and the uniformity of field irrigation, are based on the distribution of infiltration water in the soil. Under the micro-spray irrigation method, the inorganic fertilizer is dissolved in water, sprayed and then enters the field, and fertilization and irrigation are carried out simultaneously. Water movement is the direct driving force for the movement of inorganic fertilizers, but due to soil adsorption, convective migration and dispersion characteristics of inorganic solutes, and soil structure properties la...

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Problems solved by technology

Flury et al. used dye tracers to carry out water flow tracing experiments under 14 soil conditions, showing that under uniform infiltration boundary conditions, the distribution of infiltration water in soils with structural development showed obvious inhomogeneity, even in the absence of Under the conditions of structural development and relatively uniform medium, the nonlinearity of water flow movement (such as the instability of infiltration flow) will still lead to uneven distribution of infiltration water

Due to the non-uniformity of micro-spraying, as well as the non-uniformity and nonlinearity of water flow movement and inorganic solute migration in the soil, for the micro-spraying irrigation method, the measurement results based on the change of water content at the point and the change of the concentration of inorganic fertilizers The evaluation method of irrigation efficiency can not really reflect the distribution of water volume and solute after irrigation. The development of a test method for the global distribution of infiltration water and inorganic solutes under the condition of micro-sprinkler irrigation will make the evaluation of micro-spray irrigation efficiency more accurate and comprehensive. , which is more conducive to improving irrigation efficiency

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