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Increasing N uptake in elevated [CO2] conditions through manipulation of NO3:NH4 ratio in fertigated tomatoes
Year:
2022
Source of publication :
Acta Horticulturae
Authors :
Bar-Tal, Asher
;
.
Halpern, Moshe
;
.
Yermiyahu, Uri
;
.
Volume :
Co-Authors:

M. Halpern,
U. Yermiyahu,
A. Bar-Tal

Facilitators :
From page:
0
To page:
0
(
Total pages:
1
)
Abstract:

Elevated [CO2] (e[CO2]) causes an increase in biomass but a decrease in plant N concentration, leading to increased N deficiency. While increasing N fertilization may ameliorate e[CO2] induced N deficiency (eCIND), it is not necessarily environmentally feasible. In this study, we examine whether manipulation of the NO3:NH4 ratio can ameliorate eCIND. Tomato plants were grown in greenhouse chambers with 2 levels of [CO2] (400, 850 ppm) and 4 levels of NO3:NH4 in the irrigation water (100:0, 67:33, 33:67, 0:100). Biomass and leaf N concentration were measured. Total leaf N uptake and nitrogen use efficiency (NUE) were calculated. We found that e[CO2] caused a decline in N concentration. In the low N concentrations used in this experiment, manipulating the NO3:NH4 ratio did not change the N concentration in the leaves nor did it ameliorate the negative effect of e[CO2] on leaf N concentration. However, treatments that included a mix of NO3 and NH4 lead to greater N uptake in both ambient [CO2] and in elevated [CO2], leaving open the possibility of using NO3:NH4 manipulation as a tool for ameliorating eCIND in future e[CO2] conditions, perhaps in higher N conditions.

Note:
Related Files :
Carbon dioxide
nitrogen
NO3:NH4 ratio
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More details
DOI :
10.17660/ActaHortic.2022.1333.52
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
58115
Last updated date:
02/03/2022 17:53
Creation date:
02/03/2022 17:53
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Scientific Publication
Increasing N uptake in elevated [CO2] conditions through manipulation of NO3:NH4 ratio in fertigated tomatoes

M. Halpern,
U. Yermiyahu,
A. Bar-Tal

Increasing N uptake in elevated [CO2] conditions through manipulation of NO3:NH4 ratio in fertigated tomatoes .

Elevated [CO2] (e[CO2]) causes an increase in biomass but a decrease in plant N concentration, leading to increased N deficiency. While increasing N fertilization may ameliorate e[CO2] induced N deficiency (eCIND), it is not necessarily environmentally feasible. In this study, we examine whether manipulation of the NO3:NH4 ratio can ameliorate eCIND. Tomato plants were grown in greenhouse chambers with 2 levels of [CO2] (400, 850 ppm) and 4 levels of NO3:NH4 in the irrigation water (100:0, 67:33, 33:67, 0:100). Biomass and leaf N concentration were measured. Total leaf N uptake and nitrogen use efficiency (NUE) were calculated. We found that e[CO2] caused a decline in N concentration. In the low N concentrations used in this experiment, manipulating the NO3:NH4 ratio did not change the N concentration in the leaves nor did it ameliorate the negative effect of e[CO2] on leaf N concentration. However, treatments that included a mix of NO3 and NH4 lead to greater N uptake in both ambient [CO2] and in elevated [CO2], leaving open the possibility of using NO3:NH4 manipulation as a tool for ameliorating eCIND in future e[CO2] conditions, perhaps in higher N conditions.

Scientific Publication
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