PROBLEM TO BE SOLVED: To provide a fertilizing management controller solving the following problem: conventionally the concentration of a fertilizer in soil is detected by sampling clear supernatant liquid obtained by collecting the soil and drying the soil for 24 hours followed by adding distilled water, or sampling a solution in the soil after enough rainfall using a vacuum vessel so as to measure an electric conductivity.SOLUTION: The fertilizing management controller constantly monitors a soil solution EC value calculated using a soil EC sensor where a cell constant specific to the sensor is set and an electric circuit having a rated electric output is incorporated into the sensor itself, and a soil moisture sensor so as to appropriately keep the fertilizer concentration in the soil.COPYRIGHT: (C)2010,JPO&INPIT【課題】従来の土壌肥料濃度は、土壌を採集して24時間乾燥したのち蒸留水を加えた上澄み液や、十分な降雨後の土壌中の溶液を真空器で採水して電気伝導度を計測してきた。【解決手段】本発明は、センサ固有のセル定数の設定と定格電気出力を持つ電子回路をセンサ自体に内蔵した土壌用ECセンサと、土壌水分センサを使用して、算出される土壌溶液EC値を常時モニターして、土壌中肥料濃度を適正維持する施肥管理制御器を作った。【選択図】図1
