Method for controlling irrigation according to crop water shortage degree and device thereof

Abstract

The invention relates to a method for controlling irrigation according to crop water shortage degree and a device thereof. The method comprises the following steps of: determining a detection time window according to an illumination threshold and an illumination integral threshold; after entering the detection time window, simultaneously emitting ultrasonic waves to ultrasonic reflecting boards which are arranged in right front at equal intervals respectively from the positions approximately above the reference crop and the detection crop and parallel to the planes of the respective crops below at preset time intervals; when receiving the respective reflected ultrasonic waves, respectively starting and stopping the same counter; comparing the counting value with the counting threshold set according to the crop water shortage index in the ultrasonic transition time; and if the counting value is smaller than the counting threshold, the crop water shortage degree requires irrigation, then starting irrigation. The invention has the advantages of fewer detection parameters, no complicated calculation, no detection individual difference, non-contact measurement, and high economy and practicality.

Description

Technical field: [0001] The invention belongs to the technical field of agricultural irrigation, and in particular relates to a method and a device for controlling irrigation according to the water shortage degree of crops. Background technique: [0002] The growth and development of crops requires many environmental factors. When changes in these environmental factors have harmful effects on crops, it is called stress. Crops are often subjected to various environmental stresses during their growth. Studies have confirmed that the impact of water deficit on crop growth and yield exceeds the sum of all other stresses. Therefore, water is an important basic resource for agricultural production, and crop water management is one of the most important measures in crop production. Generally speaking, the root active layer (0-90cm) suitable for the normal growth and development of crops has a soil water content of 60%-80% of the field water holding capacity. If it is lower than t...

AI Technical Summary

Problems solved by technology

Although morphological indicators can be used to judge the water shortage of crops, there is a lag period in the morphological changes of crops caused by water shortage. When the above water shortage symptoms appear in the form, the physiology has already been damaged to a certain extent.

In addition, water shortage is not the only cause of crop morphological changes. Even if crop morphological changes are monitored, it is difficult to quantify the degree of water shortage.

[0005] 2. Plant water potential: The measurement of plant water potential is considered to be the most direct method to understand the degree of plant water deficit, but direct measurement of leaf water potential requires in vitro detection, which is destructive to plants

Although the application of fuzzy logic algorithm can eliminate the unreasonable situation of CWSI exceeding 0-1, the existing problems are also obvious

1. In the fuzzification process, the influence weight of each influencing factor must be artificially specified, and experience accounts for a considerable proportion; 2. The number of parameters that need to be measured is almost the same as that of the theoretical model, and there are still many parameters, and the advantages are not obvious

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