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Article

Microclimate Characteristics and Evapotranspiration Estimates of Cucumber Plants in a Newly Developed Sunken Solar Greenhouse

1
Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China
2
College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
3
School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
4
Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Centre, P.O.B 15159 Rishon, LeZion 7505101, Israel
5
HIT—Holon Institute of Technology, POB 305, Holon 5810201, Israel
*
Author to whom correspondence should be addressed.
Water 2020, 12(8), 2275; https://doi.org/10.3390/w12082275
Received: 30 June 2020 / Revised: 10 August 2020 / Accepted: 11 August 2020 / Published: 13 August 2020
(This article belongs to the Special Issue Evapotranspiration Measurements and Modeling)
In north China, vegetables are always cultivated in conventional solar greenhouses (SG), however, these structures cannot be used during most of the winter due to extremely low temperatures. In this study, a new type of a solar greenhouse named sunken solar greenhouse (SSG), where the inside soil surface is lowered 1–2 m below outside and the back wall is 5–8 m width at the bottom and 1.5–2 m on top, was investigated. Inside climatic variables were recorded and compared with those outside during seven cucumber cultivation seasons. Crop evapotranspiration (ETc) was estimated using the Penman–Monteith method. Results show that inside solar radiation was reduced by approximately 40%, however days with a daily maximum inside temperature higher than 20 °C accounted for 80–90% of the days during the winter, which greatly enhanced cucumber fruit production compared to common SGs. The reference crop evapotranspiration (ETo) inside the SSG was reduced by 27% compared to outside. The estimated ETc was generally lower than 4 mm day−1, which resulted in a basal crop coefficient of 0.83. In conclusion, the SSG is environmental-friendly, preferable for winter vegetable cultivation in north China, and can be useful for other regions of the world with cold winter conditions. View Full-Text
Keywords: sunken solar greenhouse; microclimate; decoupling coefficient; crop evapotranspiration; north China sunken solar greenhouse; microclimate; decoupling coefficient; crop evapotranspiration; north China
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MDPI and ACS Style

Liu, H.; Yin, C.; Hu, X.; Tanny, J.; Tang, X. Microclimate Characteristics and Evapotranspiration Estimates of Cucumber Plants in a Newly Developed Sunken Solar Greenhouse. Water 2020, 12, 2275. https://doi.org/10.3390/w12082275

AMA Style

Liu H, Yin C, Hu X, Tanny J, Tang X. Microclimate Characteristics and Evapotranspiration Estimates of Cucumber Plants in a Newly Developed Sunken Solar Greenhouse. Water. 2020; 12(8):2275. https://doi.org/10.3390/w12082275

Chicago/Turabian Style

Liu, Haijun, Congyan Yin, Xiaodong Hu, Josef Tanny, and Xiaopei Tang. 2020. "Microclimate Characteristics and Evapotranspiration Estimates of Cucumber Plants in a Newly Developed Sunken Solar Greenhouse" Water 12, no. 8: 2275. https://doi.org/10.3390/w12082275

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