|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 21 van 23 gevonden artikelen
| Titel: |
Soil and peach seedling responses to soluble phosphorus applied in single or multiple doses |
| Auteur: |
Neilsen, Denise Parchomchuk, Peter Hogue, Eugene J. |
| Verschenen in: |
Communications in soil science and plant analysis |
| Paginering: | Jaargang 24 (1993) nr. 9-10 pagina's 881-898 |
| Jaar: |
1993-06 |
| Inhoud: |
Two methods of measuring phosphate (P) adsorption were assessed as a means of predicting soil and plant responses to P fertigation for four British Columbia (B.C.) orchard soils. In Method 1, soils at 0.1 bar moisture tension were incubated for 1, 7, 14, 28, 56, or 84 days with solutions of H3PO4 supplied as a single or eight weekly doses. In Method 2, soils were equilibrated with P solutions at 1:10 soil:solution ratio for one day. Langmuir adsorption maxima calculated from the latter data ranged from 99 to 372 mg/kg. Solution P concentrations after one day for single dose incubations and 1:10 soil:solution equilibrations were highly correlated. Solution P concentrations remained elevated for 12 weeks after both single and weekly doses in incubated soils. Four availability indices were derived from the adsorption studies:solution P after one day equilibration for both methods and the fraction of the P adsorbing surface covered by added P at either one or fifty-six days. Peach seedlings (Prunus persica L. Batsch) were grown for 12 weeks in the greenhouse in a randomised complete block experiment with five levels of P (0, 15.5, 31, 62, and 124 mg P/kg) supplied as H3PO4 on the same schedule as for the incubated soils. Top dry matter increased in response to the first level of added P for three soils but was not correlated with any of four P availability indices measured. Initial soil solution P concentration was a better indicator of response to P fertilizer than Kelowna-extractable (0.25 M HCl + 0.015 M NH4F) P. Estimated critical values of soil solution P for the two adsorption methods were 0.85 μg/mL (Method 1) and 0.42 μg/mL (Method 2). |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 21 van 23 gevonden artikelen
| << vorige | volgende >> |