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פותח על ידי קלירמאש פתרונות בע"מ -
Nitrogen nutrition of greenhouse pepper. II. Effects of nitrogen concentration and NO3:NH4 ratio on growth, transpiration, and nutrient uptake
Year:
2001
Source of publication :
HortScience
Authors :
אלוני, בנימין
;
.
בר-טל, אשר
;
.
קרני, לאה
;
.
רוזנברג, רבקה
;
.
Volume :
36
Co-Authors:
Bar-Tal, A., Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Aloni, B., Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Karni, L., Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Rosenberg, R., Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
1252
To page:
1259
(
Total pages:
8
)
Abstract:
The objective of this research was to study the effects of N concentration and N-NO3:N-NH4 ratio in the nutrient solution on growth, transpiration, and nutrient uptake of greenhouse-grown pepper in a Mediterranean climate. The experiment included five total N levels (0.25 to 14 mmol·L-1, with a constant N-NO3:N-NH4 ratio of 4) and five treatments of different N-NO3:N-NH4 ratios (0.25 to 4, with a constant N concentration of 7 mmol·L-1). Plants were grown in an aero-hydroponic system in a climate-controlled greenhouse. The optimum N concentrations for maximum stem and leaf dry matter (DM) production were in the range of 8.0 to 9.2 mmol·L-1. The optimum N-NO3:N-NH4 ratio for maximal stem DM production was 3.5. The optimum value of N concentration for total fruit DM production was 9.4 mmol·L-1. Fruit DM production increased linearly with increasing N-NO3:N-NH4 ratio in the range studied. The N concentration, but not N source, affected leaf chlorophyll content. Shorter plants with more compacted canopies were obtained as the N-NO3:N-NH4 ratio decreased. The effect of N concentration on transpiration was related to its effect on leaf weight and area, whereas the effect of a decreasing N-NO3:N-NH4 ratio in reducing transpiration probably resulted from the compacted canopy. Nitrogen uptake increased as the N concentration in the solution increased. Decreasing the N-NO3:N-NH4 ratio increased the N uptake, but sharply decreased the uptake of cations, especially Ca.
Note:
Related Files :
calcium
Capsicum annuum
chlorophyll
Fruits
greenhouses
nitrogen
Nitrogen nutrition
Positive ions
transpiration
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
29014
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:43
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Scientific Publication
Nitrogen nutrition of greenhouse pepper. II. Effects of nitrogen concentration and NO3:NH4 ratio on growth, transpiration, and nutrient uptake
36
Bar-Tal, A., Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Aloni, B., Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Karni, L., Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Rosenberg, R., Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Nitrogen nutrition of greenhouse pepper. II. Effects of nitrogen concentration and NO3:NH4 ratio on growth, transpiration, and nutrient uptake
The objective of this research was to study the effects of N concentration and N-NO3:N-NH4 ratio in the nutrient solution on growth, transpiration, and nutrient uptake of greenhouse-grown pepper in a Mediterranean climate. The experiment included five total N levels (0.25 to 14 mmol·L-1, with a constant N-NO3:N-NH4 ratio of 4) and five treatments of different N-NO3:N-NH4 ratios (0.25 to 4, with a constant N concentration of 7 mmol·L-1). Plants were grown in an aero-hydroponic system in a climate-controlled greenhouse. The optimum N concentrations for maximum stem and leaf dry matter (DM) production were in the range of 8.0 to 9.2 mmol·L-1. The optimum N-NO3:N-NH4 ratio for maximal stem DM production was 3.5. The optimum value of N concentration for total fruit DM production was 9.4 mmol·L-1. Fruit DM production increased linearly with increasing N-NO3:N-NH4 ratio in the range studied. The N concentration, but not N source, affected leaf chlorophyll content. Shorter plants with more compacted canopies were obtained as the N-NO3:N-NH4 ratio decreased. The effect of N concentration on transpiration was related to its effect on leaf weight and area, whereas the effect of a decreasing N-NO3:N-NH4 ratio in reducing transpiration probably resulted from the compacted canopy. Nitrogen uptake increased as the N concentration in the solution increased. Decreasing the N-NO3:N-NH4 ratio increased the N uptake, but sharply decreased the uptake of cations, especially Ca.
Scientific Publication
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