Effects of Deficit Irrigation Scheduling on Water Use, Gas Exchange, Yield, and Fruit Quality of Date Palm
Abstract
:1. Introduction
- 1-
- Real-time monitoring and recording of the climatic conditions of the study area using cloud-based IoT to calculate the evapotranspiration reference (ETo) and control the irrigation scheduling.
- 2-
- Assessing two modern micro-irrigation systems (DI and SI) under three deficit irrigation treatments (50, 75, and 100% ETc) compared with the traditional surface bubbler irrigation system (Control).
2. Materials and Methods
2.1. Site Description
2.2. Irrigation Systems
2.3. IoT Monitoring and Controlling System
2.4. Experimental Design
2.5. Measurements
2.5.1. Water Use Efficiency
2.5.2. Chlorophyll Content and Gas Exchange
2.5.3. Physiochemical Characteristics of Date Fruit
2.6. Statistical Analysis
3. Results and Discussion
3.1. Meteorological Conditions and ETo
3.2. Actual Cumulative Applied Irrigation Water
3.3. Chlorophyll Content and Gas Exchange
3.4. Yield and Water Use Efficiency
3.5. Fruit Quality
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Particle Size | FC (%) | PWP (%) | pH (1:2.5) | EC (dS m−1) | HC (cm h−1) | |||
---|---|---|---|---|---|---|---|---|
Sand (%) | Silt (%) | Clay (%) | ||||||
Mean | 74.77 | 11.22 | 14.01 | 14.34 | 5.323 | 8.345 | 3.814 | 5.213 |
St. Dev. | 3.592 | 1.553 | 5.012 | 0.751 | 0.282 | 0.181 | 0.132 | 0.162 |
Months | Meteorological Variables | ETo (mm day−1) | |||||
---|---|---|---|---|---|---|---|
Min Temp (°C) | Max Temp (°C) | RH (%) | WS (km day−1) | SH (h) | Rad (MJ m−² day−1) | ||
January | 12.1 ± 4.3 | 26.1 ± 3.2 | 50.1 ± 18.3 | 8.24 ± 1.8 | 7.91 ± 0.2 | 15.2 ± 0.7 | 3.61 ± 1.1 |
February | 10.6 ± 3.2 | 25.2 ± 1.9 | 58.2 ± 10.7 | 6.32 ± 2.4 | 8.14 ± 0.1 | 17.5 ± 0.6 | 4.71 ± 1.2 |
March | 12.9 ± 4.6 | 28.2 ± 2.8 | 49.9 ± 12.6 | 7.23 ± 1.6 | 8.51 ± 0.1 | 21.1 ± 0.7 | 5.95 ± 1.3 |
April | 19.1 ± 3.2 | 32.6 ± 3.3 | 48.3 ± 16.5 | 8.11 ± 1.4 | 8.69 ± 0.1 | 21.9 ± 0.8 | 6.41 ± 1.1 |
May | 24.9 ± 3.1 | 42.1 ± 3.1 | 30.2 ± 12.4 | 7.32 ± 1.5 | 8.99 ± 0.2 | 23.8 ± 0.5 | 8.82 ± 1.4 |
June | 27.5 ± 2.1 | 47.9 ± 2.4 | 28.4 ± 15.2 | 8.31 ± 1.3 | 8.57 ± 0.2 | 24.7 ± 0.4 | 9.28 ± 1.0 |
July | 29.8 ± 1.8 | 48.3 ± 3.2 | 29.3 ± 18.2 | 8.21 ± 1.6 | 9.99 ± 0.2 | 25.6 ± 0.3 | 9.55 ± 1.5 |
August | 29.7 ± 2.1 | 47.8 ± 2.4 | 33.1 ± 17.1 | 7.99 ± 2.1 | 9.89 ± 0.1 | 25.3 ± 0.6 | 8.99 ± 1.6 |
September | 27.1 ± 1.8 | 44.9 ± 2.2 | 41.8 ± 16.4 | 7.65 ± 1.7 | 9.87 ± 0.2 | 22.6 ± 0.8 | 8.64 ± 1.3 |
Irrigation Systems | % ETc | Chlorophyll (SPAD) | Photosynthesis (µmol CO2 m−2 s−1) | Stomatal Conductance (mol H2O m−2 s−1) | Transpiration (mmol H2O m−2 s−1) | Inter. CO2 Conc. (µmol CO2 mol−1) |
---|---|---|---|---|---|---|
Control | 100 | 62.04 a ± 6.03 | 13.52 a ± 2.45 | 0.059 a ± 0.009 | 1.391 a ± 0.41 | 149.5 cd ± 15.7 |
SI | 50 | 55.91 b ± 5.38 | 13.16 a ± 2.45 | 0.052 bd ± 0.01 | 1.193 ab ± 0.33 | 158.9 bd ± 17.1 |
75 | 58.55 ab ± 6.12 | 13.41 a ± 2.16 | 0.049 ce ± 0.01 | 1.223 ab ± 0.33 | 164.5 ac ± 17.8 | |
100 | 62.69 a ± 5.89 | 13.39 a ± 2.2.17 | 0.053 ad ± 0.01 | 1.392 a ± 0.37 | 169.8 ab ± 23.3 | |
DI | 50 | 45.81 c ± 10.43 | 8.66 c ± 2.19 | 0.039 f ± 0.007 | 0.962 b ± 0.22 | 178.2 a ± 26.6 |
75 | 47.54 c ± 9.11 | 9.34 c ± 1.74 | 0.044 ef ± 0.01 | 0.952 b ± 0.21 | 165.9 ab ± 23.7 | |
100 | 55.64 b ± 5.56 | 11.21 b ± 2.06 | 0.047 de ± 0.01 | 1.231 ab ± 0.23 | 169.8 ab ± 22.9 |
Irrigation Systems | % ETc | Yield (kg palm−1) | Water Use Efficiency (kg m−3) |
---|---|---|---|
Control | 100 | 32.41 ab ± 3.06 | 0.59 c ± 0.05 |
SI | 50 | 29.87 b ± 4.51 | 1.09 a ± 0.15 |
75 | 39.40 a ± 0.87 | 0.88 ab ± 0.03 | |
100 | 39.03 a ± 2.93 | 0.71bc ± 0.05 | |
DI | 50 | 14.23 c ± 2.05 | 0.52 cd ± 0.08 |
75 | 26.50 b ± 4.27 | 0.62 c ± 0.13 | |
100 | 32.13 ab ± 3.96 | 0.59 c ± 0.08 |
Fruit Characteristics | Irrigation Treatments | ||
---|---|---|---|
DI (50% ETc) | SI (50% ETc) | Control (100% ETc) | |
Fruit weight (g) | 7.13 b ± 0.41 | 9.31 a ± 0.33 | 9.55 a ± 0.56 |
Fruit length (mm) | 31.2 c ± 0.30 | 36.2 a ± 0.34 | 37.9 a ± 0.43 |
Fruit diameter (mm) | 23.3 b ± 0.11 | 24.3 a ± 0.12 | 24.8 a ± 0.21 |
Pulp weight (g) | 6.51 b ± 0.21 | 7.51 a ± 0.16 | 7.89 a ± 0.23 |
Firmness (N mm−2) | 6.38 b ± 0.29 | 2.98 a ± 0.56 | 2.90 a ± 0.32 |
Moisture content (%) | 12.6 b ± 0.12 | 13.6 a ± 0.66 | 14.1 a ± 0.54 |
Fruit pH | 6.8 a ± 0.21 | 6.8 a ± 0.14 | 6.67 a ± 0.23 |
TSS (ºBrix) | 62.9 a ±0.16 | 62.9 a ± 0.24 | 62.1 a ± 0.23 |
L (Lightness) | 34.9 b ± 2.2 | 44.9 a ± 3.2 | 44.2 a ± 3.8 |
a (Greenness–redness) | 12.5 a ± 1.2 | 12.5 a ± 3.2 | 12.3 a ± 2.3 |
b (Blueness–yellowness) | 19.6 a ± 2.1 | 19.6 a ± 3.9 | 20.5 a ± 3.8 |
Hue angle | 59 a ± 3.6 | 59.3 a ± 5.2 | 59.5 a ± 6.3 |
Chroma | 23.1 a ± 4.1 | 23.1 a ± 4.6 | 23.9 a ± 5.1 |
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Mohammed, M.; Sallam, A.; Munir, M.; Ali-Dinar, H. Effects of Deficit Irrigation Scheduling on Water Use, Gas Exchange, Yield, and Fruit Quality of Date Palm. Agronomy 2021, 11, 2256. https://doi.org/10.3390/agronomy11112256
Mohammed M, Sallam A, Munir M, Ali-Dinar H. Effects of Deficit Irrigation Scheduling on Water Use, Gas Exchange, Yield, and Fruit Quality of Date Palm. Agronomy. 2021; 11(11):2256. https://doi.org/10.3390/agronomy11112256
Chicago/Turabian StyleMohammed, Maged, Abdelkader Sallam, Muhammad Munir, and Hassan Ali-Dinar. 2021. "Effects of Deficit Irrigation Scheduling on Water Use, Gas Exchange, Yield, and Fruit Quality of Date Palm" Agronomy 11, no. 11: 2256. https://doi.org/10.3390/agronomy11112256