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Published online 1 January 1970
Published in Agron J 62:29-32 (1970)
© 1970 American Society of Agronomy
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Critical Levels of Manganese and Magnesium in Cotton at Different Stages of Growth1

R. H. Gheesling and H. F. Perkins2

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.

Key Words: Blade-petiole-stem manganese • Blade-petiole-stem magnesium • Sand culture

1 Contribution from the University of Georgia, College of Agriculture Experiment Stations, Journal Series Paper Number 519, College Station, Athens, Georgia 30601.

2 Graduate Research Assistant and Professor of Agronomy, respectively.

Received for publication May 12, 1969.




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