Irrigation control method and system for saline-alkali land

Abstract

The invention discloses an irrigation control method and system for saline-alkali soil. The irrigation control method includes the following steps that parameters are set, soil water content of all soil layers of a root zone is monitored, root zone weighting average soil water content and root zone weighting average soil water percolation are calculated based on relative root length density distribution, and CWSI is calculated; when a CWSI calculation value is larger than a preset CWSI critical value, irrigation is started; the theoretical irrigation amount is calculated according to soil water content distribution in a planned moisture layer. When the practical irrigation amount reaches the theoretical irrigation amount, irrigation is stopped. According to the irrigation control method and system for saline-alkali soil, influences on transpiration and growth of crops by soil water content, salinity and root distribution are comprehensively considered, the water stress degree of the crops on the saline-alkali soil are estimated more accurately and more conveniently and an effective tool is provided for achieving the purposes of saving agricultural water and boosting the yield of the saline-alkali soil.

Description

technical field [0001] The invention relates to automatic control technology, more specifically to an irrigation control method and system for saline-alkali land. Background technique [0002] my country's saline-alkali soil area is about 520 million mu, with great potential for development and utilization. For crops in saline-alkali land, besides soil moisture, soil salinity is also an important factor affecting their water absorption, growth and yield. The higher the salinity of the soil, the higher the salt concentration of the soil solution, and the lower the soil water osmotic potential, thereby reducing soil water availability and causing water stress (also often called salt stress) to crops, and even poisoning to crops . It can be seen that the effects of soil moisture and salinity must be considered at the same time for irrigation of crops in saline-alkali land. When irrigation is insufficient, crops may slow down their growth rate or even reduce their yield due t...

AI Technical Summary

Problems solved by technology

However, the existing methods of the second category only consider the influence of soil moisture on crop growth and transpiration when judging the irrigation time, but ignore the influence of soil salinity

Therefore, before applying the second type of method to irrigation control of crops in saline-alkali land, it still needs to be improved to consider the joint stress of soil moisture and salinity on crops, otherwise it will bring large deviations to the accuracy of irrigation control

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