Device for measuring leaching loss amount of fertilizer and water retaining effect of soil water-retaining agent

Abstract

The invention discloses a device for measuring the leaching loss amount of fertilizer and the water retaining effect of a soil water-retaining agent. The device comprises a soil box, a bracket, a sliding water-collecting disc and a filtering net which are connected together, wherein the soil box is separated into two tanks through a clapboard in the middle; a water inlet hole with the diameter of 3cm is formed in the upper part of one side of each soil tank; multiple drainage holes with the diameter of 2mm are formed in a bottom plate of the box; the filtering net is laid on the bottom plate of the soil box; the mesh diameter is small enough to prevent soil particles from leaking along with water; the bracket comprises four upright posts which are fixed through transverse moment, the distance between each two adjacent upright posts is 122cm, and each upright post is 40cm long; two chutes parallel to the opposite sides of the transverse moment of the bracket are welded at the part, which is 20cm away from the upper end, of the bracket; the bottom area of the water collecting disc is the same as that of the soil box, baffles with the height of 5cm are arranged at the periphery of the water collecting disc, the water collecting disc is separated into two parts through a clapboard in the middle, a group of scales is marked on the baffle at the periphery of each part, and the minimum measurement unit of the scales is 1mm.

Description

technical field [0001] The invention relates to a device and a use method for measuring the leaching loss of chemical fertilizers and the water retention effect of soil water-retaining agents, which belong to the device for agricultural research and the experimental method thereof. Background technique [0002] At present, soil water retaining agent is widely used in agricultural production, afforestation, flower cultivation, orchard, lawn and road slope protection, etc. It is an effective chemical water-saving material. When water-retaining agents are used in various fields, users are concerned about the water-retaining ability and continuous use time of the water-retaining agent, that is, the water-retaining effect. So far, users or researchers of soil water-retaining agents only know that they are effective when they are used, or the theoretical water-retaining capacity of water-retaining agents is measured in the laboratory. However, in the natural state or close to the...

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Problems solved by technology

Among them, the "pot planting method" mainly calculates the absorption of chemical fertilizer nutrients by crops and the residual amount in the soil by testing various indicators of crops and soil, and then calculates the difference between the total amount of chemical fertilizer applied and the nutrient content absorbed by crops and residual soil. Calculating the leaching loss of chemical fertilizer nutrients, the test results of this method are real and intuitive, and have reference value, but the pot test is more complicated and takes a long time. Nutrients are difficult to distinguish clearly, resulting in large experimental errors; "Static dissolution method in water" and "soil column leaching method" calculate the leaching loss of chemical fertilizers by simulating the application process of chemical fertilizers, different dissolution routes and detection methods Quantitative, simple, fast and efficient, it is the most commonly used experimental technique in the research of fertilizer efficiency and leaching, but these two methods are greatly affected by operators, and the simulated experimental conditions are far from the process of chemical fertilizer leaching in the field. The accuracy and stability of the results are not ideal

[0004] The inevitable flaws in the traditional methods of studying the leaching of chemical fertilizers and the water retention effect of water-retaining agents make it difficult to obtain accurate results on the absorption of chemical nutrients, leaching losses of nutrients, and the effects of water-retaining agents, which limits the research on the efficient use of chemical fertilizers and water-retaining agents. Promote the development of applied work

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