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Properties of cobalt supply from soils and of cobalt uptake by forage crops



Properties of cobalt supply from soils and of cobalt uptake by forage crops



Journal of the College of Dairying (Ebetsu) 11(1): 225-234



Cobalt is not an essential nutrient for plant growth, but it is essential for animal health. Cobalt also is one of compositive element of vitamin B12. While deficiency of cobalt as a trace element is reported in many parts of the world, however, the cause of this disease can only be found by the approach from animal diagnosis. Therefore we investigated the cobalt supply from four typical different soils in Hokkaido [Japan] and the uptake of cobalt by forage crops. The cobalt was analyzed by atomic absorption spectrophotometer. The results of this investigation was as follow; (1) The correlation coefficient between the content of cobalt extracted from the diluvial soils by 0.1 N hydrochloric acid and the concentration of dry matter of orchardgrass was r = 0.940. (2) The total cobalt content of four different soils were from 45 to 65 ppm for pumice volcanic soil, from 32 to 49 ppm for alluvial soil, from 26 to 44 ppm for diluvial soil, and from 6 to 12 ppm as Co for pest soil. The content range of cobalt extracted from these soils by 0.1 N hydrochloric acid were from 1.38 to 2.65 ppm for alluvial soil, from 0.89 to 2.25 ppm diluvial soil, from 0.50 to 1.90 ppm for peat soil, and from 0.43 to 1.75 ppm as Co for pumice volcanic soil. (3) The ranges of cobalt concentration in forage crops grown on these four soils were from 0.16 to 0.57 for alfalfa, and 0.11 to 0.32 ppm for orchardgrass. The relationship between the content of colbalt extracted from soil by 0.1 N hydrochloric acid and the cobalt concentration in the alfalfa was r = 0.42, and in orchardgrass was r = 0.90. (4) When cobalt was added to the soils from 0 to 0.8 g Co m2 with CoCl2 in diluvial soil), these cobalt concentrations in alfalfa were increased from 0.16 to 0.66 ppm, and in the orchardgrass from 0.16 to 0.80 ppm, but the yield of the plants were gradual decreased. Therefore, it was suggested that cobalt supply from soil to forage crop was different from the four soils in the Hokkaido, and cobalt added to the soil improved the cobalt concentration in forage crops.

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