A monitoring system for an irrigation system that includes a nozzle and a product source that supports a product for mixing with water from a water source to which the irrigation system is operably coupled. The monitoring system includes: a sensor configured to generate a first electrical signal indicative of a travel speed and/or a travel direction of the irrigation system; a fluid pressure sensor configured to generate a second electrical signal indicative of a flow rate, a processor, a memory, and a variable speed pump or a valve. The memory includes instructions, which when executed by the processor cause the monitoring system to: receive the first and second generated electrical signals, determine an applied rate of the irrigation fluid over a predetermined irrigation area based on the first and second electrical signals, and adjust the flow rate of the irrigation fluid through the at least one nozzle.