Daniel Adamson Department of Plant Sciences, University of Wyoming

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Presentation transcript:

Daniel Adamson Department of Plant Sciences, University of Wyoming Use of manufacturer-specified value of greenhouse film transmissivity to estimate solar radiation and crop evapotranspiration in a hoop house Daniel Adamson Department of Plant Sciences, University of Wyoming

Outline Introduction Methods Results Discussion Conclusions

Introduction What is a hoop house? Why should I care? 2 million hectares (Pardossi et al., 2004) 37,500 hectares in Southern Spain (Bonachela et al., 2006) Pardossi et al. (2004)

Hoop Houses in Wyoming UW Agricultural Extension Popularity rising Resource use important Irrigation scheduling to conserve water and benefit crops Too expensive? Too complicated? Wyoming Hoop House Info Network

Weather-based irrigation scheduling Temperature Humidity Wind Solar Radiation Estimated inside solar radiation = measured outside solar radiation x transmissivity (Valdes-Gomez et al., 2009) Transmissivity: the degree to which a medium allows something, particularly electromagnetic radiation, to pass through it. (Google)

Objective To determine if solar radiation can be estimated inside a hoop house using the manufacturer-specified value of film transmissivity. Facilitate the use of weather-based models to estimate crop evapotranspiration for accurate irrigation.

Methods Evapotranspiration calculated with FAO-56 PM equation (Allen et al., 1998) Control Irrigated with measured solar radiation Treatment Irrigated with estimated solar radiation

Results

Results

Results

Results

Results Parameter Measured Solar Radiation Estimated Solar Radiation Emergence (%) 79.7 (18.8) a 76.5 (14.1) a Height at VT (cm) 168.9 (8.1) a 174.7 (9.4) a Yield (g) 1508 (463) a 1439 (263) a

Discussion and Conclusions Reduction in transmissivity is expected Shading Dust/Debris Condensation (Geoola et al., 1998; Wang & Boulard, 2000) Process may still be valuable because it facilitates the use of irrigation scheduling Adjusting manufacturuer-specified transmissivity may increase accuracy.

Acknowledgements This study was funded by Wyoming’s Experimental Program to Stimulate Competative Research (EPSCoR). I would also like to thank Axel Garcia y Garcia for assistance with all aspects of project development, execution, and analysis; David Legg for his assistance with experimental design and statistical anaylsis; and Shaun Wulff for statistical analysis.

References Allen, R.G., L.S. Pereira, D. Raes, M. Smith. (1998). Crop evapotranspiration - Guidelines for computing crop water requirements. Irrigation and drainage Paper No. 56. FAO, Rome. Bonachela, S., Gonzalez, A., Fernandez, M. (2006). Irrigation scheduling of plastic greenhouse vegetable crops based on historical weather data. Irrigation Science, 25: 53-62. Geoola, F., Kashti, Y., & Peiper, U. (1998). A model greenhouse for testing the role of condensation, dust, and dirt on the solar radiation transmissivity of greenhouse cladding material. Journal of Agricultural Engineering Research, 71:339-346. Pardossi, A., Tognoni, F., & Incrocci, L. (2004). Mediterranean greenhouse technology. Chronica Horticulturae, 44(2): 28-34. Valdes-Gomez, H., Ortega-Farias, S., & Argote, M. (2009). Evaluation of water requirements for a greenhouse tomato crop using the priestly-taylor method. Chilean Journal of Agricultural Research, 69(1): 3-11. Wang, S., & Boulard, T. (2000). Measurement and prediction of solar radiation in full-scale greenhouse tunnels. Agronomie, 20: 41-50.