SOIL STATE ESTIMATION DEVICE, FIELD MANAGEMENT DEVICE, SOIL STATE ESTIMATION METHOD, AND SOIL STATE ESTIMATION PROGRAM

摘要

A soil state estimation device includes an estimation unit (81) that, on the basis of the oxygen concentration in the soil of a field, estimates a first state amount relating to the amount of ammonium ions in the soil, or a second state amount related to the nitrogen assimilation speed of crops in the field.