436 GENETICS IN RELATION TO AGRICULTURE 
Minimum Standards Recommended for Varietal and Similar Tests with Corn. 
Duration of trials: Five seasons. 
Size of plots in plot-tests: Five rows each of twenty-five hills or each 5 rods long. 
Outer two rows to be discarded. 
Length of rows in row-tests: Twenty-five hills or row 5 rods long. 
Number of checks: Every fifth plot or every fifth row. 
Number of replications: Five times in rows; at least twice, preferably 3 times, in 
plots. 
In row tests only closely similar varieties should be in contiguous rows. 
Minimum Standards Recommended for Varietal and Similar Tests with Small 
Grains. 
Duration of trials: Five seasons. 
Plot tests: 
Size of plots: 149 to 149 acre. 
Number of replications: At least twice, preferably 5 times. 
Number of checks: Every third plot. 
Margins on outside plots: There should be a border of at least 3 feet to dis- 
card. Paths or division strips are preferably avoided when possible. 
Blocks: Square, so as to permit changing the direction of the plots from season 
to season. 
Shape of plots: Long and narrow. Each season the series of plots should be laid 
out at right angles to the previous plots. 
Previous crops: The record for 3 years should be given. 
Row Tests: ‘ 
Length of rows: One rod or more. 
Distance between rows: Six to 10 inches. 
Method of seeding: Drilled at optimum rate of seeding under field conditions. 
Rate of seeding: To be indicated. 
Checks: Every fifth row. 
Replications: Ten times. 
In row tests the outside row should always be discarded. 
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