Abstract
Water scarcity is seriously affecting agricultural production, especially in arid and semi-arid areas. Therefore, there is increasing interest in improving water productivity in agriculture. This research aims to study the effects of deficit irrigation on the productive response of sweet pepper plants. Nine deficit irrigation strategies were assayed during two seasons (2017 and 2018) in a randomised complete block design with three replicates. These irrigation strategies consisted of applying 100%, 75% and 50% of the irrigation water requirement (IWR) during the entire growing period (continued deficit irrigation) or applying 75% or 50% of the IWR during one of the following stages (regulated deficit irrigation): vegetative growth, fruit setting, and harvesting. Pepper plants cultivated under deficit irrigation reduced fruit biomass and indicators of plant water status. Applying water deficits during the vegetative growth and fruit-setting stages had minimal effects on the marketable yield but with minimal water savings. Irrigating pepper plants with 75% or 50% of the IWR during the entire crop cycle or with 50% of the IWR during harvesting resulted in a high incidence of fruits affected by blossom end rot, which in turn, led to a drastic reduction of the marketable yield in relation to fully irrigated plants (− 36%, − 55% and − 44%, respectively). These strategies also recorded the highest soluble solid and phenolic contents. Reducing the water applied to 75% of the IWR at harvesting led to a yield reduction (− 19%) but with important water savings (21%) and acceptable levels of soluble fruit solids and phenolic compounds.
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Abbreviations
- AWC:
-
Available water content
- BER:
-
Blossom end rot
- CI:
-
Colour index
- C*:
-
Chroma
- CDI:
-
Continued deficit irrigation
- ET:
-
Evapotranspiration
- ETa:
-
Actual crop evapotranspiration
- ETm:
-
Maximum crop evapotranspiration
- ETo:
-
Reference evapotranspiration
- ETc:
-
Crop evapotranspiration
- DM:
-
Dry matter
- Ef:
-
Irrigation efficiency
- Epan:
-
Evaporation from a class A pan
- FC:
-
Field capacity
- FW:
-
Fresh weight
- GS:
-
Growing season
- H°:
-
Hue angle
- HI:
-
Harvest index
- IS:
-
Irrigation strategy
- IWA:
-
Irrigation water applied
- IWR:
-
Irrigation water requirement
- IWUE:
-
Irrigation water use efficiency
- K c :
-
Crop coefficient
- K p :
-
Pan coefficient
- K y :
-
Yield response factor
- MY:
-
Marketable yield
- MI:
-
Maturity index
- MSI:
-
Membrane stability index
- Pe:
-
Effective precipitation
- PWP:
-
Permanent wilting point
- RDI:
-
Regulated deficit irrigation
- RWC:
-
Relative water content
- SSC:
-
Soluble solids content
- VSWC:
-
Volumetric soil water content
- WUE:
-
Water use efficiency
- Ya:
-
Actual marketable yield
- Ym:
-
Maximum marketable yield
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Abdelkhalik, A., Pascual, B., Nájera, I. et al. Effects of deficit irrigation on the yield and irrigation water use efficiency of drip-irrigated sweet pepper (Capsicum annuum L.) under Mediterranean conditions. Irrig Sci 38, 89–104 (2020). https://doi.org/10.1007/s00271-019-00655-1
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DOI: https://doi.org/10.1007/s00271-019-00655-1