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Cobalt status of New Jersey soils and forage plants and factors affecting the cobalt content of plants



Cobalt status of New Jersey soils and forage plants and factors affecting the cobalt content of plants



Soil Sci 76(4): 273-284



A survey was made of the Co content of forage plants in New Jersey in relation to the problem of ruminant nutrition. Several factors that influence the Co content of plants were studied. Determinations were made of the total Co content of different particle-sized fractions from various horizons of 2 soils and of the A horizons of 20 of the most important agricultural soils of the state. Alfalfa from field plots limed to different pH levels was analyzed to determine the effect of soil reaction on the availability of soil Co. The effect on Co uptake of different levels of Mn and Fe was studied in soln. culture with Co60. 34 plant spp. were grown in field under identical conditions to determine their comparative Co contents. The total Co content of New Jersey soils ranged between 0.2 and 30.8 ppm. Coastal Plain soils contained less Co than did those from the Appalachian Province. The texture of soil was an important factor in determining Co content. The average Co content of alfalfa from various soils in New Jersey ranged between 0.05 and 0.22 ppm. Plants from poorly drained soils were higher in Co than were those from the well-drained soils. It was estimated that alfalfa grown on the most important agricultural soils of the state would contain only betwen 0.04 and 0.97 ppm. Co, amts. considered insufficient for the needs of sheep. All samples collected from Lakewood and Squires soils and more than 50% of those from the Collington and Rockaway soils fell into this category. Applications of liming materials reduced availability of soil Co. Alfalfa from soils with pH values above 7.2 contained only about half as much Co as did that from soils with pH values of 5.8. An increase in the amt. of available Mn or Fe in a nutrient solution caused a marked reduction in the amt. of Co taken up by the plant.

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Accession: 013664024

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DOI: 10.1097/00010694-195310000-00004



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