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The effect of some soil properties and of the nitrogen phosphorus potassium fertilization level on the uptake of cobalt by plants 1. results of investigations on the relation between cobalt content in plants and soils



The effect of some soil properties and of the nitrogen phosphorus potassium fertilization level on the uptake of cobalt by plants 1. results of investigations on the relation between cobalt content in plants and soils



Acta Agraria et Silvestria Series Agraria 20: 57-80



Co content was determined in 66 samples each of arable soils and red clover, as well as 85 samples each of meadow soils and herbage taken from various regions of southern Poland. The samples of plants were taken in the same places as the soil samples. The plant samples were taken directly before harvesting the 1st cut. The samples of arable soils (under clover) were taken from the 0-20 cm layer, while the soil samples, from meadows were taken from 2 layers (0-10 and 11-20 cm). In the soil samples, the following values were determined: total content of Co and that of Co extractable in 2.5% acetic acid; pH; mechanical composition; organic mater content and total contents of Mn, Fe and P (as factors which could influence the amount and availability of Co). The total content of Co in soils under clover was between 2.2 and 14.1 ppm, and in the meadow soils between 0.6-27.9 ppm in the 0-10 cm layer and 0.6-20.4 ppm in the 11-20 cm layer. The mean proportion of extractable Co in its total amount is 6.2% soils under clover, and in meadow soils: 6.6% in the 0-10 cm layer, 4.1% in the 11-20 cm layer. The content of total Co and its amount extractable in 2.5% acetic acid were positively correlated. Among the investigated arable soils, the most Co was contained in brown and alluvial soils, the least in rendzinas. Among the analyzed meadow soils, there was no correlation between soil type and Co content. The content of Co in red clover was 0.04-0.26 ppm. Its content in meadow herbage ranged in similar limits. A significant, although small correlation was shown between the content in soil of Co extractable in 2.5% acetic acid and its occurrence in plants, while there is no such correlation in the case of total Co content. Among other calculated correlation indices, the significant ones are the following: a small positive correlation between Co content in red clover and the amount of clay in soil; between Co content in meadow herbage and the soil content of organic matter and a Fe and negative correlation between Co content in herbage and the pH of meadow soils. This indicates the necessity of considering not only the content of Co extractable in 2.5% acetic acid but also other soil properties. About 15% of the clover samples and 47% of the meadow herbage samples contained insufficient amounts of Co (0.07 ppm).

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