A farmer selecting flat fan spray nozzles for weeds would choose which number for the highest delivery rate?

The number associated with flat fan spray nozzles indicates both the type of nozzle and its delivery rate. The first two digits of a nozzle designation represent the orifice size in 64ths of an inch, while the last two digits typically indicate the spray angle in degrees.

In this context, the nozzle labeled 8004 has an orifice size of 1/8 inch (since 8004 translates to 8*64 = 1/8), and the "04" indicates a particular flow rate and spray width. The higher the first two numbers, as seen in 11002, denotes a larger orifice size compared to those with lower numbers.

Therefore, the nozzle with the designation 8004 is designed to deliver a greater volume of liquid—contributing to a higher delivery rate—compared to the others listed. Larger orifice sizes facilitate increased flow, making the 8004 the optimal choice for effectively applying herbicides in weed management.