Method and device for determining irrigation timing and irrigation amount

Abstract

The embodiment of the invention provides a determining method and device for the irrigation opportunity and the irrigation volume. The method comprises the steps that crop evapotranspiration of an area to be irrigated is calculated according to meteorological data of the area to be irrigated within a past preset time period and meteorological data within a future preset time period; the actual soil water content of the area to be irrigated is measured continuously, and water consumption of the area to be irrigated is calculated according to the variable quantity of the actual soil water content; the irrigation opportunity and the irrigation volume of the area to be irrigated are determined according to the crop evapotranspiration and the water consumption of the area to be irrigated. According to the method, an evapotranspiration method used for large-range decision making and a soil water method used for small-range decision making are effectively combined together and can be used for making irrigation decisions for large-range open type farmlands, grasslands and forests, and accuracy of irrigation decision making can be improved.

Description

technical field [0001] The invention relates to the technical field of irrigation, in particular to a method and device for determining the timing and amount of irrigation. Background technique [0002] In the prior art, there are mainly two decision-making theoretical systems for irrigation: the first is the water loss method based on the water balance equation and evapotranspiration. Evapotranspiration (or called evapotranspiration rate), the irrigation scheme is determined according to the crop evapotranspiration, but the crop evapotranspiration is calculated based on meteorological data, due to the uncertainty of the meteorological data itself, and the obtained crop evapotranspiration has no The uncertainty of crop evapotranspiration will affect the accuracy of the irrigation scheme; the second is the soil moisture method based on the actual measured soil moisture. The essence of this method is to measure the actual content of the soil by experiment or instrument measure...

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Problems solved by technology

[0002] In the prior art, there are mainly two decision-making theoretical systems for irrigation: the first is the water loss method based on the water balance equation and evapotranspiration. Evapotranspiration (or called evapotranspiration rate), the irrigation scheme is determined according to the crop evapotranspiration, but the crop evapotranspiration is calculated based on meteorological data, due to the uncertainty of the meteorological data itself, and the obtained crop evapotranspiration has no The uncertainty of crop evapotranspiration will affect the accuracy of the irrigation scheme; the second is the soil moisture method based on the actual measured soil moisture. The essence of this method is to measure the actual content of the soil by experiment or instrument measurement The amount of water, according to the law of water demand for crop growth and the measured actual soil water content, calculates the amount of water that needs to be irrigated at this stage. However, because the actual water content of the soil is obtained based on experiments or instrument measurements, experiments or instrument measurements are not suitable for many The actual soil water content measured can only represent the local soil, but cannot represent the actual water content of the large-scale soil. Therefore, if this method is used to determine the irrigation scheme of the field, there will be accuracy problems.

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