Last Effective Bloom 8-22-16 Some spotty rain in the region is allowing us to set some top crop. Whenever that happens, the question always comes up about when is the last day a bloom on the plant can turn into a harvestable boll. This year that question is probably applicable to a larger percentage of our cotton than normal as 75% of the crop has not cut out. In another week, I think most of this will cut out and I believe the blooms this week will have a chance to become mature bolls by the first half of October. The rule of thumb I always use is that it takes a boll about 45 days after bloom to get mature enough for a high rate of Prep to open it. That assumes average heat in September to accomplish this. If we actually get blooms the last few days in August, then we need October heat which is predictably lower so maybe 50 days for these late August blooms. As you would expect, it would take unusually warm weather in the fall to get a boll from a September bloom to mature. Based on these ideas, I believe this is the last week of bloom for normal weather.
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