Abstract
Abstract The aim of this study was to determine the salt tolerance of pepper (Capsicum annuum L.) under greenhouse conditions and to examine the interactive effects of salinity and nitrogen (N) fertilizer levels on yield. The present study shows the effects of optimal and suboptimal N fertilizer levels (270 kg ha−1 and 135 kg ha−1) in combination with five different irrigation waters of varying electrical conductivity (EC) (ECiw = 0.25, 1.0, 1.5, 2.0, 4.0, and 6.0 dS m−1) and three replicates per treatment. At optimal N level, yield decreased when the irrigation water salinity was above ECiw 2 dS m−1. At the suboptimal N level, a significant decrease in yield occurred only above ECiw 4 dS m−1. At high salinity levels the salinity stress was dominant with respect to yield and response was similar for both N levels. Based on the results it can also be concluded that under saline conditions (higher than threshold salinity for a given crop) there is a lesser need for N fertilization relative to the optimal levels established in the absence of other significant stresses. Keywords: irrigationwater qualitysoil salinitypepper (Capsicum annuum L.)nitrogen fertilizationyield
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Claims 4
Claim · model-written summary
At optimal nitrogen, pepper yield decreased above irrigation salinity of ECiw 2 dS m−1.
- Taxon
- PEPPER (CAPSICUM ANNUUM L.)t0
- Treatment
- irrigation water salinitye1
- Outcome
- yielde1
- Direction
- decreasede1
- Value
- ECiw 2 dS m−1e1
- Qualifier
- optimal N levele1
Not reportedComparator
Verbatim
e1“At optimal N level, yield decreased when the irrigation water salinity was above ECiw 2 dS m−1.”
t0“PEPPER (CAPSICUM ANNUUM L.)”
Claim · model-written summary
At suboptimal nitrogen, pepper yield significantly decreased only above irrigation salinity of ECiw 4 dS m−1.
- Taxon
- PEPPER (CAPSICUM ANNUUM L.)t0
- Treatment
- ECiw 4 dS m−1e1
- Outcome
- yielde1
- Direction
- decreasee1
- Value
- ECiw 4 dS m−1e1
- Qualifier
- suboptimal N levele1
Not reportedComparator
Verbatim
e1“At the suboptimal N level, a significant decrease in yield occurred only above ECiw 4 dS m−1.”
t0“PEPPER (CAPSICUM ANNUUM L.)”
Claim · model-written summary
At high salinity, pepper yield responses were similar at both nitrogen levels.
Verbatim
e1“At high salinity levels the salinity stress was dominant with respect to yield and response was similar for both N levels.”
t0“PEPPER (CAPSICUM ANNUUM L.)”
Claim · model-written summary
The authors conclude that pepper needs less nitrogen fertilization under saline conditions than optimal levels established without other major stresses.
Verbatim
e1“under saline conditions (higher than threshold salinity for a given crop) there is a lesser need for N fertilization relative to the optimal levels established in the absence of other significant stresses.”
t0“PEPPER (CAPSICUM ANNUUM L.)”
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