Abstract

THE cotton plant is well known to shed some of its fruiting-points following periods of cloudy weather, and such shade-induced losses are often in excess of the natural shedding normally associated with healthy cotton plants growing in a cloudless environment. Dunlap1 was able definitely to show that phases of excess shedding followed two to eight days after a particular cloud event. Confirmation of Dunlap's work was recently published2, and it was further demonstrated graphically that a series of cloud changes was followed by corresponding variations in the number of fruit-points lost daily from plants at Tokar in the Anglo-Egyptian Sudan. For some of the varieties tested, however, prolonged periods of cloudy weather Were not associated with sustained heavy shedding.

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