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A Computerized Process for Soil Test Data Acquisition¹

A mini-computer with 64K words of memory and a real-time clock was interfaced to pH meters, AA spectrometers, and colorimeters to measure pH, buffer pH, K, Mg, Ca, and P. The data acquistion process is assisted by custom-made, manually operated, operator-and-instrument interfaces (011), which allow technicians to command the mini-computer to perform certain tasks. These operations are controlled by a memory resident program in the mini-computer named MONITOR, which monitors the state of the 011 switches. When MONITOR senses a switch closure, it causes B proper program to he loaded for execution from a moving head disc. Most of the user real-time software routines are written in FORTRAN, but some routines are written in ASSEMBLY. Data collected are transmitted to an IBM 3031 for execution of the fertilizer recommendations program.

Key Words: Fertilizer recommendations • Electronic interfaces

² Research associate, associate professor, professor, agricultural engineer, director of National Tillage Machinery Lab., and professor, respectively.

Received for publication March 8, 1982.