in Determination of Performance, Water Use Efficiency and Simulation of Lettuce’s Canopy Cover in Hydroponic Cultivation and Soil Cultivation by AquaCrop Model

Document Type : Original Article

Authors

1 Master Science Student, Department of Irrigation and Drainage Engineering, Aburaihan Campus, University of Tehran.

2 Professor,Department of Irrigation and Drainage Engineering, Aburaihan Campus, University of Tehran.

3 Associate Professor, Department of Irrigation and Drainage Engineering, Aburaihan Campus, University of Tehran.

4 Assistance Professor, Department of Horticulture, Aburaihan Campus, University of Tehran.

Abstract

In recent years, there has been high attention towards soilless cultivation or hydroponic for growing plants in greenhouses. In the current study we addressed normalized water productivity of lettuce (Lactuca sativa) between soil and hydroponic cultivations and also the assessment of AquaCrop model in simulation of yield and water use efficiency of lettuce cultivation methods. The Normalized Water Productivity is used for simulating plant growth in AquaCrop model. The experiments on two mentioned cultivations were conducted during two cultivation periods. The first cultivation’s data were used for calibrating the productivity parameter of normalized water and the second’s cultivation data were used for validation. The obtained results suggested that the productivity parameter of normalized water was different for soil and hydroponic cultivations, it was 14.3 and 15.8 g m-2, respectively for the two cultivation types. AquaCrop model was performed using these amounts for second cultivation period and the value of biomass was simulated during growth period and then was compared to the measured values. The results indicated that AquaCrop model simulated the performance of lettuce with a suitable accuracy during growth period using the calibrated values of normalized water productivity. Water use efficiency (WUE) was also measured and simulated in both cultivation periods for hydroponic and soil cultivations. The results indicated that the water use efficiency (WUE) in hydroponic is higher than WUE in soil cultivation. Also, the amount of canopy cover was measured for both culture mediums in both cultivation periods and was simulated by the model and the results showed that the model simulates the amount of canopy cover well for both culture mediums. Also AquaCrop model has higher accuracy in the simulation of performance and WUE for lettuce. According to the obtained results, it was concluded that the culture medium influenced the performance of lettuce plant; and performance and WUE in hydroponic cultivation is higher than soil cultivation. Furthermore, AquaCrop model has relatively high accuracy in the simulation of performance, WUE, and also simulation of canopy cover for lettuce plant.

Keywords

References

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Iranian Journal of Irrigation & Drainage
Volume 14, Issue 6 - Serial Number 84
January and February 2021
Pages 2075-2088

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