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This article in AJ

  1. Vol. 62 No. 1, p. 29-32
     
    Received: May 12, 1969


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doi:10.2134/agronj1970.00021962006200010010x

Critical Levels of Manganese and Magnesium in Cotton at Different Stages of Growth1

  1. R. H. Gheesling and
  2. H. F. Perkins2

Abstract

Abstract

Cotton 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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