Fig. 1. Minimum air and soil (10-cm depth) temperatures at the Agronomy Research Center during the 2 yr of the study. Dates of the first killing freeze (-4°C) were 5 Nov. 1998 and 15 Nov. 1999.
Fig. 1. Minimum air and soil (10-cm depth) temperatures at the Agronomy Research Center during the 2 yr of the study. Dates of the first killing freeze (-4°C) were 5 Nov. 1998 and 15 Nov. 1999.