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Manganese Supply, Growth, and Micronutrient Concentration in Grain Sorghum 1
Author(s) -
Ohki K.
Publication year - 1975
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1975.00021962006700010008x
Subject(s) - sorghum , manganese , micronutrient , nutrient , zinc , leaf blade , greenhouse , chemistry , agronomy , sorghum bicolor , crop , horticulture , zoology , biology , organic chemistry
Reference values for manganese related to plant growth are needed for the assessment of Mn status and micronutrient relationships associated with Mn in grain sorghum ( Sorghum bicolor [L.] Moench.). Sorghum was grown to boot stage in nutrient solution with eight Mn levels from 0 to 4,000 µg Mn/liter under greenhouse conditions. Sorghum growth and Mn concentrations in vegetative tissues were dependent on Mn supply in nutrient solution. Mn concentrations of blades 1 (flag‐leaf) through 5 in basipetal order were related to plant growth but blade 1 was the most sensitive tissue in relating Mn concentration to plant growth. The critical Mn levels for blades 1, 2, and 3 were 10, 10, and 15 ppm, respectively, while critical levels for blades 4 and 5 were 32 and 60 ppm, respectively. Blade 1 is suggested as the leaf to sample at boot stage for evaluating the Mn status of the plant. Zinc concentration in blade tissue increased at Mn concentrations below the critical Mn level. Copper concentration remained relatively constant within a wide range of Mn concentration and Fe concentration decreased at low Mn supply levels.