To give reliable information such tests should include at least three replications of each hybrid. Results are more meaningful if they are averaged over several locations. Yields from single plots or fields are of little value for comparing yields whether machine harvested or not. They are valuable, however, for observations on maturity and plant characteristics. Farmer testing also is helpful.
Many farmers get some seed of a few promising hybrids in their area and set up their own tests.
To provide a basis for sound decisions, farmer tests must be randomized and replicated. They must be planted at the proper date, have good weed control, good fertility level, and good general management. The farmer must keep accurate notes on date of planting, plant population, date of maturity, disease observations and harvest data. Farmers should test each hybrid for two or more years in comparison with those currently being grown on his farm. To improve the reliability of such tests, refer to G84-723, Maximizing the Use of Farm Strip Plots .