Soil chemical sensor and precision agricultural chemical deliver

Details Soil chemical sensor and precision agricultural chemical deliver Soil chemical sensor and precision agricultural chemical deliver

1990-07-31

1991-07-23

Steinberger, Brian S.

Planting

Liquid or gas soil treatment

47 13, 204400, 324347, A01C 2300

Patent

active

050333976

ABSTRACT:
A real time soil chemical sensor and precision agricultural chemical delivery system includes a plurality of ground-engaging tools in association with individual soil sensors which measure soil chemical levels. The system includes the addition of a solvent which rapidly saturates the soil/tool interface to form a conductive solution of chemicals leached from the soil. A multivalent electrode, positioned within a multivalent frame of the ground-engaging tool, applies a voltage or impresses a current between the electrode and the tool frame. A real-time soil chemical sensor and controller senses the electrochemical reaction resulting from the application of the voltage or current to the leachate, measures it by resistivity methods, and compares it against pre-set resistivity levels for substances leached by the solvent. Still greater precision is obtained by calibrating for the secondary current impressed through solvent-less soil. The appropriate concentration is then found and the servo-controlled delivery system applies the appropriate amount of fertilizer or agricultural chemicals substantially in the location from which the soil measurement was taken.

REFERENCES:
patent: 2454952 (1948-11-01), Starkey et al.
patent: 3625166 (1971-12-01), Woodley
patent: 3723989 (1973-03-01), Fathauer et al.
patent: 3877401 (1975-04-01), Gutman
patent: 4015366 (1977-03-01), Hall, III
patent: 4333096 (1982-06-01), Jenkins

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