Under the same conditions however, squash (Praecitrullus fistulosus Pang.) plants failed to exhibit any signs of chlorine deficiency. Species not affected or least affected by low chlorine supply appear to accumulate more chlorine than provided by the culture solutions. It has been assumed that chlorine was absorbed from the atmosphere and that plants differed in this ability (6,7). More recently, low-chlorine solution studies have produced chlorine deficiency symptoms in red clover (Trifolium pratense L.) and in wheat (Triticum aestivum L.) (8-10). Thus, the essentiality of chlorine has been established by the observations of the deficiency in a wide range of species.
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