Being aware of the cool germ results is probably more important than what is actually a good or bad cool germ. As long as you are aware of the cool germ values for a given seed lot you can plan accordingly. A somewhat arbitrary division of cool germination values follows in Table 1. Cool germination ratings. Do not plant during cool periods .
Cool temperatures can be especially detrimental during the first two days after planting.
The DD60 forecast for the five days following planting is the best indicator we have of planting conditions. The table below offers guidelines as to the relationship between DD60' s and planting conditions. The relationship between DD60's and planting conditions. 16 to 25 Adequate greater than 25 Very Good Cotton seedlings are particularly susceptible to cool weather when they first imbibe water and the 2 days following imbibition. Figure 1 shows the sensitivity to chilling injury with time.