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Details van artikel 101 van 164 gevonden artikelen
| Titel: |
Measurement of plant-available zinc in British Columbia orchard soils |
| Auteur: |
Neilsen, Denise Hoyt, Paul B. MacKenzie, Angus F. |
| Verschenen in: |
Communications in soil science and plant analysis |
| Paginering: | Jaargang 18 (1987) nr. 2 pagina's 161-186 |
| Jaar: |
1987-02 |
| Inhoud: |
Zinc availability in 20 southern British Columbia orchard soils was examined in the greenhouse. Zinc concentration, uptake and yield in navy beans (Phaseolus vulgaris) were measured and compared with soil Zn extracted by MgCl2 at three concentrations (1.0 M, 0.50 M and 0.25 M), DTPA, 0.10 M HC1 and 0.05 M HC1 + 0.0125 M H2SO4 (Mehlich No. 1). Adding Zn at the rate of 10 mg/kg did not increase yields. Available Zn varied greatly as measured by the soil tests and by plant Zn concentration and uptake. These availability indices, except for plant Zn concentration, varied directly with Bray-P1 extractable P and organic matter content. Plant Zn uptake and concentration and MgCl2 extractable Zn also varied inversely with pH. Zinc extracted by MgCl2 was more closely related to plant zn concentration and uptake than Zn extracted by the other three extractants. Furthermore, extraction of Zn with 0.25 M MgCl2 instead of with 1 .0 M MgCl2 decreased analytical difficulties with atomic absorption spectrophotometry and also resulted in improved relationships with plant Zn concentration (increased r = 0.69 to r = 0.89). Comparisons between Zn and Mn extracted by MgCl2 solutions ranging from 1 .0 M to 0.01 M in strength and at different soil:extractant ratios indicated that 0.25 M MgCl2 (1:2 soil:extractant ratio) extracted less specifically adsorbed Zn than 1.0 M MgCl2 which resulted in the improved relationship with plant Zn. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 101 van 164 gevonden artikelen
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