US Patent 7694638 Modular liquid metering system for an agricultural implement

A liquid metering system for an agricultural implement is modular, having individual metering pumps for each crop row. The pumps are individually controlled for precise application of the liquid input and are preferable electrically driven. A common pump is used, making the system modular in that varying sizes of implements can be produced by varying the number of pumps. A common supply line is used to supply a liquid input from a reservoir to the pumps. Each pump is connected to the common supply line. By connecting each pump to the common supply line, the difficulty of routing individual hoses from a central pump to each row unit are overcome.