Studies on the Manganese Excess of Muskmelon

VI. Manganese Distribution in the Plant Parts

Abstract

Muskmelons were grown in soil adjusted to 3 pH levels; 6.4 (high), 5.5 (medium) and 4.5 (low), and in sand fertilized with a complete nutrient solution containing 0.5, 30 and 60ppm Mn, and also 0, 0.5 and 60ppm Mn to determine the effect of Mn excess on the growth and Mn distribution of the various parts of the organs. Plant growth was severely restricted at the low pH. Mn in the various parts of the organs was significantly increased by lowering soil pH, and by increasing Mn concentrations in the nutrient solution. Mn in the leaf blades and petioles tended to be higher in the lower part than in the middle and higher parts. More Mn accumulated in the external tissues, especially in the hairs. Mn in the fine roots was much higher than in the large ones. Mn in the fruit was increased in the inner flesh, outer flesh and rind in this order.