Summary
The absorption and transport of Cu were studied in perennial ryegrass grwon on 21 soils under controlled environment conditions. Neither the concentration, nor the total amount, of Cu in the shoots was related to available Cu in the soils as assessed by extraction with 0.05M EDTA, 0.005M DTPA, or 1.95 per cent HNO3. The concentration in the roots and, more especially, absorption per unit weight of root (i.e. μg Cu g dry wt−1) were, however, highly correlated with available soil Cu. This suggests that, unless the extent of exploitation of the soil by roots is taken into account, measurements of available Cu will not be effective in predicting uptake by plants.
On average, 63 per cent of the Cu absorbed by the roots was retained in the roots, and variation in the proportion retained was related to the transport of nitrogen from roots to shoots. On some soils the concentrations of N and Cu in the shoots were significantly correlated, and variation in N concentration accounted for a considerable proportion of the variance in the Cu concentration at later harvests. The relative importance of the measured soil (pH, organic matter) and plant (dry weight, N content) factors changed markedly over 6 successive harvests.
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Jarvis, S.C., Whitehead, D.C. The influence of some soil and plant factors on the concentration of copper in perennial ryegrass. Plant Soil 60, 275–286 (1981). https://doi.org/10.1007/BF02374111
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DOI: https://doi.org/10.1007/BF02374111