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| Titel: |
Mineral nutrition of chickpea plants supplied with NO3 or NH4-N |
| Auteur: |
Bot, J. Le Alloush, G. A. Kirkby, E. A. Sanders, F. E. |
| Verschenen in: |
Journal of plant nutrition |
| Paginering: | Jaargang 13 (1990) nr. 12 pagina's 1591-1605 |
| Jaar: |
1990-12 |
| Inhoud: |
Chickpea plants (Cicer arietinum L cv. ILC 195) were grown for 24 days in water culture with NO3 or NH4-N, with or without P. The lack of P in the nutrient medium depressed total plant fresh and dry weight yields but did not induce visual symptoms of P deficiency in the shoots despite the low P concentrations found in the plant tissues. For both N-forms, P stress decreased shoot dry weights. The effect of the stress on the root systems varied with the N-source. For NO3-fed plants, roots of stressed plants were longer and slightly greater in weight than those of unstressed plants but for plants supplied with NH4-N, root weight was depressed by the lack of P. With both forms of N, P stress decreased the shoot:root ratio. For the unstressed plants the forms of N-nutrition induced typical changes in the nutrient solution but when NO3-fed plants were deprived of P, the nutrient medium became more acid. The response of the NO3-fed P-stressed plants to acidify the nutrient medium was slow. Phosphorus stress decreased the total uptake of all ions. For NO3-fed plants the uptake of Mg was less affected by the stress and, in contrast to K and Ca, was increased in relation to the depression in growth. P stress depressed the uptake of anions more than cations and NO3- uptake was most affected. For NH4-fed plants, P stress decreased the uptake of anions more than cations. Of the major cations, K and Ca were particularly depressed but Mg was less affected. The uptake of NH4 was slightly enhanced in relation to the reduction in growth, indicating that N was not the limiting factor for plant growth. With both forms of N there was evidence of a greater accumulation of organic anions in the roots and sap of P deficient plants. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 10 gevonden artikelen
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