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Details van artikel 35 van 183 gevonden artikelen
| Titel: |
Correlation of several tests for phosphorus with resin extractable phosphorus for 30 alkaline soils |
| Auteur: |
Nesse, P. Grava, J. Bloom, P. R. |
| Verschenen in: |
Communications in soil science and plant analysis |
| Paginering: | Jaargang 19 (1988) nr. 6 pagina's 675-689 |
| Jaar: |
1988-05 |
| Inhoud: |
Phosphorus was extracted from 30 alkaline soils from western Minnesota using the Olsen NaHCO3, the Soltanpour AB-DTPA, Mehlich 2, Mehlich 3, Bray-1, and resin methods. Values from the first six methods were compared to resin extractable phosphorus. The NaHCO3-P values for 30 soils were most closely related to resin extractable-P values with r - 0.943, followed by the AB-DTPA with r - 0.889, and Mehlich 3 with r - 0.809. Bray-1 values from three different soil-to-solution ratios were less closely related to resin P. The correlation coefficient between Olsen NaHCO3-P and Bray-1 was r - 0.693 for all 30 soils. Soils were divided on the basis of their reaction to dropwise addition of 10% HC1. Violently effervescent samples (n-15), with one exception, were found to be those soils in the study group with calcium carbonate equivalent (CCE) ranging from 7 to 62 percent. Non-violently effervescing soils (n-15) were found to have CCE of less than 7 percent. The elimination of the violently effervescing, high CCE soils from the study group resulted in r values greater than 0.9 for all methods when compared to resin P. Improvement in the relationships between the acid extractants (Bray-1 and Mehlich 2 and 3) with resin P was attributed to elimination of high CCE soils. Improvement in the relationship between AB-DTPA and resin P was attributed to the removal of high clay soils that, by chance, also contained high CCE. Olsen NaHCO3 and Bray-1 (1:10 soil-to-solution ratio) values were closely related (r-0.973) for the non-violently effervescing (low CCE) soils. Only the NaHCO3 values were closely related to resin P for the 15 high calcium carbonate soils, although AB-DTPA values were closely related to resin P when the high clay (> 35%) soils were removed. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 35 van 183 gevonden artikelen
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