What is the expected range of DD60's from first flower to open boll?

The expected range of DD60's (Degree Days above 60 degrees Fahrenheit) from the first flower to the open boll for cotton is typically in the range of 850 to 950 DD60's. This range is based on the plant's developmental requirements, where a certain amount of heat accumulation is necessary for the cotton plant to progress from flowering to the point where the bolls open.

Understanding DD60 as a measurement of heat accumulation helps growers predict phenological stages of cotton, which in turn informs management practices such as irrigation, pest control, and harvesting. The 850 to 950 DD60's range reflects a balance that enables the cotton plant to mature the bolls effectively when growing under optimal conditions and typical regional climates. While some factors can influence these values, such as specific varietal differences or environmental stresses, the 850 to 950 DD60's range is generally accepted as a guideline for the growth stage in question.