Abstract
AbstractCotton was grown 105 days in washed silica sand and subjected to levels of Mn and Mg above and below amounts necessary to create visual deficiency symptoms. Leaf blades were found to be the best indicator of the nutrient status of Mn and Mg. The levels below which Mn deficiency was evident in the blades were 15 ppm. Plant leaf blade tissue containing less than 2,000 ppm Mg exhibited Mg deficiency. Leaf petioles and stems were less desirable as indicators of the Mn and Mg status of cotton than leaf blades.
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