Table 1: Environmental conditions and plant size for preemergence and postemergence applications for field research in 2002 and 2003.

Application 20022003

Preemergence
 Date19 April2 May
 Air temperature (°C)2218
 Soil temperature (°C)1816
Postemergence
 Date6 June27 June
 Height (cm)5–255–20
 Leaf number6–104–12
 Population (no/m2)419–586382–528
 Cloud cover (%)58
 Relative humidity (%)3357
 Air temperature (°C)3025