A Method for Evaluating the Canopy Penetration of Plant Chemical Solution

Abstract

The invention relates to an assessment method for penetrability of a plant liquid medicine canopy. The assessment method comprises the following steps: (1) by taking a multi-layer instrument shelter as a plant canopy model, inserting blades, regulating and recording quantity of blades at each layer, blade layer spacing, single-layer blade porosity, an interlayer blade arrangement mode and blade elastic modulus; (2) arranging water-sensitive paper on front and back surfaces of each blade; (3) vertically placing the multi-layer instrument shelter on a measuring point, performing liquid medicine spray experiment above the multi-layer instrument shelter, and recording wind speed of the canopy surface; (4) collecting the water-sensitive paper, and recording parameter information such as grain size of deposited fog drops and a rate of deposition; (5) processing data, and quantitatively analyzing a relationship between parameters. According to the assessment method, by regulating the parameters of the canopy perpendicular wind speed, the single-layer blade porosity, the blade layer spacing, the blade elastic modulus and the like, the correlation between a penetration rate of fog drops with different grain sizes and each parameter is analyzed and extracted, so that a theoretical direction is provided for required drug delivery dose for plant protection and a fog drop grain size range.

Description

technical field [0001] The invention relates to a method for evaluating the penetrability of a plant medicinal liquid canopy, and belongs to the technical field of plant protection. Background technique [0002] In plant protection operations in forests, orchards, and paddy fields, the canopy penetration rate (Canopy Penetration) of the liquid medicine directly affects the application effect. However, there is no uniform standard for the definition of canopy penetration. Teske (1993,1994) defined canopy penetration as the penetration depth of the canopy before the droplet is deposited. And Farooq (2002) defined the canopy penetration rate as the amount of medicinal solution entering different canopy depths. At present, the measurement methods used to study the canopy penetration rate of plant medicinal liquid mainly include the cotton thread method and the water-sensitive paper method. [0003] The cotton thread method, such as figure 1 As shown, the real plants are spra...

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Problems solved by technology

However, this method has great uncertainty: firstly, it is difficult to obtain the leaf area index at different depths; secondly, plants with the same leaf area index and different leaf arrangement may also have greater droplet penetration Thirdly, the wind speed perpendicular to the surface of the canopy also has a great influence on the droplet penetration of the canopy. For the study of real plants, the wind speed in different areas of the canopy is not uniform, and it is difficult to quantitatively obtain the wind speed and droplet penetrating relationship

[0006] Therefore, the current measurement methods and analysis methods for evaluating the canopy penetration of plant medicinal liquid are greatly affected by the external environment, there are many influencing factors, and the relationship between various factors is complicated. It is difficult to extract quantitative guidance from the obtained data. As a result, it is impossible to give actual operating standards and specifications in production, and to quantitatively study the law of droplet penetration in scientific research

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