Summary
Four out of six extractants were found to be promising for the prediction of critical level and response of barley grown in pots to copper application in young alluvium calcareous soils of Bihar (India). The critical level of available copper using DTPA-CaCl2 (pH 7.3), EDTA-(NH4)2CO3 (pH 8.6), NH4-oxalate and Mg (NO3)2, (pH 5.9) was 0.65, 0.82, 0.73 and 0.53 ppm, respectively. The relative extraction capacity of these extractants followed the order:
The amount of copper extracted by these extractants showed a significant and positive correlation with the concentration of Cu in plants, Cu-uptake, percentage yield and percentage uptake of Cu. Similar relation was found with clay and free CaCO3. They showed a significant negative correlation with soil pH. The amount of Cu extracted by DTPA-CaCl2 and EDTA-(NH4)2CO3 bore a significant positive correlation with organic carbon content of soils but the amount of Cu extracted by NH4-oxalate and Mg (NO3)2 was not significantly correlated with organic carbon content of soils.
Among all the four extractants, DTPA-CaCl2 was found to be the most and Mg (NO3)2 to be the least promising extractants in predicting variability of available Cu in soils. EDTA-(NH4)2CO3 proved to be better extractant than NH4-oxalate. The critical concentration of Cu in barley plant was 6.75 ppm below which responses to Cu application may be expected.
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Singh, R.R., Prasad, B. & Sinha, H. Selection of suitable extractant for predicting the response of barley (Hordeum vulgare L) to copper application in calcareous soils. Plant Soil 93, 211–222 (1986). https://doi.org/10.1007/BF02374223
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DOI: https://doi.org/10.1007/BF02374223