The invention discloses a water-
fertilizer-integrated four-control irrigating and fertilizing 
system. The 
system comprises middle-level soil 
moisture sensors and bottom-level soil 
moisture sensors, which are arranged in dense root areas of plants or middle parts of maximum root soil functional areas, wherein a controller is connected with the middle-level soil 
moisture sensors and the bottom-level soil moisture sensors. According to the 
system, the operation is easy, labor is saved, and the popularization and application are facilitated; accurate 
fertilizer application is achieved through scientifically formulating the total amount of 
fertilizer application according to the 
nutrient requirements of crops and regulating and controlling the amount of applied fertilizer through methods such as metered fertilizer application, concentration control, designed 
irrigation and fertilizer application frequency and proportional fertilizer applicator application, and equipment, and 
irrigation and fertilizer application control is carried out according to water and fertilizer requirement rules of the crops, so that the crops can be good in growth, high and stable yield is achieved, environmental 
pollution caused by excessive 
irrigation and fertilizer application can be controlled, and thus, the irrigation and fertilizer application of comprehensive and accurate control on the period and duration of irrigation and fertilizer application, the total amount and single usage amount of fertilizer application, the degree and depth of irrigation humidification and the concentration and 
nutrient proportion of fertilizer and water are truly achieved.