20 Nebraska Agricultural Exp. Station, Research Bui. 13 
Fig. 3 — Competition between two types of wheat in adjacent rows. 
The single-row method of testing is unreliable 
Fig. 4 — The "block" method of comparing varieties or selections for 
yield in the nursery. The two outside rows of each block should be 
discarded in order to avoid error from competition between adjacent 
plats. Part of the plats have been harvested 
