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| Titel: |
Interaction between Plant Nutrients: IV. Interaction between Calcium and Phosphate |
| Auteur: |
Jakobsen, Svend Tage |
| Verschenen in: |
Acta agriculturae Scandinavica. Section B, Soil and plant science |
| Paginering: | Jaargang 43 (1993) nr. 1 pagina's 6-10 |
| Jaar: |
1993-03-01 |
| Inhoud: |
The interaction between calcium and phosphate is complex because these ions both support and counteract each other. The supporting effect is due to a simultaneous uptake and translocation of calcium and phosphate. The counteracting effect is caused by precipitation of less soluble calcium phosphates at the vicinity of nutrient-absorbing roots. At high activity ratios between potassium and calcium the risk of calcium deficiency is obvious. The capability of plants to absorb calcium ions is then increased by application of soluble phosphate fertilizers. In a field experiment, application of potassium chloride decreased the uptake of phosphorus and crop yield. Application of ammonium phosphate increased the content of water-soluble phosphate in a soil extract and the early uptake of phosphorus and calcium. Application of ordinary superphosphate had less effect than ammonium phosphate on the solubility of phosphate in the soil, whereas the calcium ion activity and crop yield increased considerably. Excess input of potassium is usual on farms with a high animal stocking rate and on vegetable farms where potash fertilizers have been used in excessive amounts for years. Decreased uptake and utilization of magnesium and calcium in plants cause quality problems for products. It is suggested to limit excessive fertilization of potassium and to control the balances between nutrients by testing the activity ratios in the soil extracts. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 12 gevonden artikelen
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