Method and device for determining most unfavorable irrigation point of crops and server

The invention discloses a method and device for determining the most unfavorable irrigation point of crops and a server. The method comprises the steps of obtaining the maximum root system depth of crops according to the crop variety number and the planting area number; determining a field water-holding capacity correction coefficient under a preset irrigation condition, and obtaining single-layersoil allowable water consumption under the irrigation condition; generating a root layer soil calculation depth value according to the maximum root system depth of the crops; obtaining the soil allowable water consumption under the irrigation condition according to the single-layer soil allowable water consumption under the irrigation condition and the root layer soil calculation depth value; andif the allowable water consumption of the soil in the surface soil type partition under the irrigation condition is the minimum value and the preset land occupation proportion value is not less thanthe minimum value of the pr