SOME EFFECTS OF ZINC ON SEVERAL SPECIES OF GOSSYPIUM L

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Abstract
G. hirsutum, G. barbadense and G. arboreum were grown in sand culture with 3 levels of nutrient zinc. 0.000, 0.001, and 0.1 ppm. Deficiency symptoms are described and the need for nutrient Zn by all spp. for mature fruit formation noted. The height growth of the 3 spp. was differentially affected by the various levels of Zn. G. arboreum, which is normally much taller than the other 2 spp., was shorter than the minus -Zn plants of the other spp. Apparently the 3 spp. have either a different rate of production of auxin or a different sensitivity to the same level.
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