Irrigation control method and system based on crop root zone soil moisture and root distribution

Abstract

The invention discloses an irrigation control method and system based on crop root zone soil moisture and root distribution. The method comprises the steps that parameters are set, soil water content in each soil layer of a root zone is monitored, root zone weighted average soil water content is computed according to relative root length density distribution, a crop water stress index (CWSI) is computed, when the CWSI computed value is larger than a preset CWSI critical value, irrigation is started; theoretical irrigation amount can also be computed according to planned moisture layer soil water content, and when practical irrigation amount reaches the theoretical irrigation amount, irrigation is stopped. According to the irrigation control method and system, the water stress degree of crops can be accurately and conveniently estimated, the fact that the root zone soil moisture distribution conditions and the crop moisture conditions are considered during irrigation is controlled according to the water stress degree, and an effective tool is provided for realizing of the purposes of water saving and production increasing.

Description

technical field [0001] The invention relates to automatic control technology, and more particularly to an irrigation control method and system based on the distribution of soil moisture and root system in the root zone of crops. Background technique [0002] It is the key to realize the goal of water saving and yield increase by adjusting the soil moisture status of the root zone of dry crops in a timely manner, so that it is not only conducive to crop absorption and utilization, but also reduces losses such as soil surface evaporation and deep seepage. Therefore, it is of great significance to popularize the automatic irrigation control system of farmland, and the irrigation control method is its core. [0003] So far, existing irrigation control methods can be roughly divided into the following two categories. The first type of irrigation control method uses the physiological response of crops to water stress (such as changes in physiological indicators such as canopy tem...

AI Technical Summary

Problems solved by technology

Therefore, it is unreasonable to only consider the arithmetic mean soil water content in the root zone or the soil water content at a certain depth in the root zone apart from the soil water distribution and root growth distribution when evaluating crop water status, that is, estimating CWSI

It can be seen that the second type of irrigation control method has obvious shortcomings in terms of scientificity. Using this method to judge the irrigation time will bring large deviations, which will affect crop growth and irrigation water use efficiency.

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