| Titre : | The efficiency of nutrient utilization of tomato using the nutrient film technique | | Type de document : | texte imprimé | | Auteurs : | Rachid Sahraoui, Auteur ; P. Newton, Directeur de thèse | | Editeur : | Manchester : [s.n.] | | Année de publication : | 1991 | | Importance : | 268 f. | | Présentation : | ill. | | Format : | 30 cm. | | Note générale : | Phd Thesis : Environmental engineering : Victoria University of Manchester : 1991
Bibliogr. f. 270 - 277 . Annexe f. 279 - 306 | | Langues : | Anglais (eng) | | Mots-clés : | Tomato cultivar counter
Nutrient film technique
Nutrient use efficiency | | Index. décimale : | D001591 | | Résumé : | The tomato cultivar counter has been grown using Nutrient Film Technique at different time of the year with different nutrient solution stregths in order to investigate the reasons for variability in Nutrient Use Efficiency (N.U.E.) i.e. the relationship between production of fruit per unit uptake of N, P, K and ca.
The technique of growth analysis was used to determine primary and derived growth data of plants grown at high density (11.9 plants/M²) up to anthesis and at low density (3.5 plants/m²) from just before anthesis to 119 days from sowing.
Solution strength from CF to 30 and from 20 to 173 were used for the high and low density plants respectively.
During sample intervals mean air temperature ranged from just over 18°C to 25.7°C per day, and PAR from 30 J/cm²/day to 544 J/cm²/day.
Data for flower and fruit dry weights plotted against the total tissue N, P, K and Ca content gave irrespective of plant age, sowing date and nutrient solution conditions, r² of 0.94, 0.90, 0.94 and 0.85 for N, P, K and Ca respectively.
There was no consistent effect of growing conditions or plant age that could be related to the deviations from the regression lines, except some of the results for N and P were for plants that only had flowers and few green fruit.
When amounts of light were relatively low (i.e on average less than 100 J/cm²/day PAR), growth rates were relatively low, some inflorescences aborted and flowering and fruiting were delayed.
Insufficient data was obtained, however, to be able to assess the effect of inflorescences abortion on N.U.E.with the group of plants that had some aborted first inflorescences, the percentages ranged from 30 to 60%, with the high figure coming from the lowest nutrient solution strength (CF20).
Increase in solutionstrength from 20 to 50 did not, however, give a systematic reduction in percentage abortion.
The amount of PAR associated with the abortion was 48 J/cm²/day.
No inflorescences aborted on another group of plants grown with 41 J/cm²/day, during the period when abortion might have been expected to occur; possible reasons for this difference were discussed.
With this group of plants, there was a decrease in ratio of leaf plus stem plus root dry weight to flower dry weight with increase in solution nutrient strength from CF10 to 30. |
The efficiency of nutrient utilization of tomato using the nutrient film technique [texte imprimé] / Rachid Sahraoui, Auteur ; P. Newton, Directeur de thèse . - Manchester : [s.n.], 1991 . - 268 f. : ill. ; 30 cm. Phd Thesis : Environmental engineering : Victoria University of Manchester : 1991
Bibliogr. f. 270 - 277 . Annexe f. 279 - 306 Langues : Anglais ( eng) | Mots-clés : | Tomato cultivar counter
Nutrient film technique
Nutrient use efficiency | | Index. décimale : | D001591 | | Résumé : | The tomato cultivar counter has been grown using Nutrient Film Technique at different time of the year with different nutrient solution stregths in order to investigate the reasons for variability in Nutrient Use Efficiency (N.U.E.) i.e. the relationship between production of fruit per unit uptake of N, P, K and ca.
The technique of growth analysis was used to determine primary and derived growth data of plants grown at high density (11.9 plants/M²) up to anthesis and at low density (3.5 plants/m²) from just before anthesis to 119 days from sowing.
Solution strength from CF to 30 and from 20 to 173 were used for the high and low density plants respectively.
During sample intervals mean air temperature ranged from just over 18°C to 25.7°C per day, and PAR from 30 J/cm²/day to 544 J/cm²/day.
Data for flower and fruit dry weights plotted against the total tissue N, P, K and Ca content gave irrespective of plant age, sowing date and nutrient solution conditions, r² of 0.94, 0.90, 0.94 and 0.85 for N, P, K and Ca respectively.
There was no consistent effect of growing conditions or plant age that could be related to the deviations from the regression lines, except some of the results for N and P were for plants that only had flowers and few green fruit.
When amounts of light were relatively low (i.e on average less than 100 J/cm²/day PAR), growth rates were relatively low, some inflorescences aborted and flowering and fruiting were delayed.
Insufficient data was obtained, however, to be able to assess the effect of inflorescences abortion on N.U.E.with the group of plants that had some aborted first inflorescences, the percentages ranged from 30 to 60%, with the high figure coming from the lowest nutrient solution strength (CF20).
Increase in solutionstrength from 20 to 50 did not, however, give a systematic reduction in percentage abortion.
The amount of PAR associated with the abortion was 48 J/cm²/day.
No inflorescences aborted on another group of plants grown with 41 J/cm²/day, during the period when abortion might have been expected to occur; possible reasons for this difference were discussed.
With this group of plants, there was a decrease in ratio of leaf plus stem plus root dry weight to flower dry weight with increase in solution nutrient strength from CF10 to 30. |
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