Serada Saks ı da Yetiştirilen New Guinea lmpatiens Bitkisinin Dinamik Transpirasyonu

Öz

Bilgisayarl ı sera ortam ı nda yetiştirilen New Guinea Impatiens Impatiens X hb. 'Equinox' bitkisinin transpirasyonu tart ı l ı lizimetre yard ı m ı yla ölçüldü. Transpirasyon hava nem aç ığı , solar radyasyon ve kombinasyon eşitliğ i dikkate al ı narak değ erlendirildi. Kombinasyon eşitliği; 0.92 regrasyon katsay ı s ı , 0.11 hata kareler ortalamas ı ve 0.95 uyum indeksi ile transpirasyonu doğru bir şekilde tahmin etmiştir. Ortalama trasnpirasyon s ı cak günler için 400 g/m2h, bulutlu günler için ise 325 g/m 2h olarak bulunmuştur. Bitkiler, damla sulama sisteminde ortam nemini ölçen tansiyometreler kullan ı larak 5 kPa ile 20 kPa aral ığı nda sulanmışt ı r. Bitki yaprak s ı cakl ığı , yüksek transpirasyondan dolay ı önemli ölçüde sera hava s ı cakl ığı ndan düşük bulunmuştur.

Anahtar Kelimeler

• transpirasyon
• new guinea impatiens
• otomasyon
• solar radyasyon
• buhar bas ı nc ı aç ığı
• damla sulama

Dynamic Transpiration of a Greenhouse Grown Potted New Guinea Impatiens

Abstract

Transpiration rates of New Guinea Impatiens lmpatiens X hb. cv. 'Equinox' grown in a computercontrolled greenhouse were measured by using weighing lysimeter and evaluated according to solar radiation, vapor pressure deficit, and a combination model. The combination model was accurately estimated transpiration rate with an r2 of 0.92, RMSE of 0.11, and d of 0.95. The average transpiration rate of the plant was about 400 g/m 2h for sunny days and 325 g/m2h for partly cloudy days. In the range of between 5 kPa and 20 kPa, tensiometer-based drip irrigation system was used to irrigate the plants automatically. During the daytime period, canopy leaf temperature was found considerably lower than greenhouse air temperature due to high transpiration rate.

Keywords

• tranpiration
• new guinea impatiens
• automation
• solar radiation
• yapar pressure deficit
• drip irrigation

References

1. AI-Shooshan, A. A. 1991.Greenhouse Total Water Use Analysis Modeling and Optimization, Ph.D. thesis, The Ohio State University, OSU press, Columbus, OH., 186.
2. Chartzoulakis, K., B. Noitsakis, and I. Therios, 1993. Photosynthesis, plant growth and dry matter distribution in kiwifruit as influenced by water defı cits. Irrigation Science, 14:1-5.
3. Fynn, R. P., A. AI-Shooshan, T. H. Short and R. W. McMahon, 1993. Evapotranspiration Measurements and Modeling for a Potted Chrysanthemum Crop, Transactions of the ASAE, 36(6),1907-1913.
4. Jackson, R. D., S. B. Idso, R. J. Reginato and P. J. Pinter, 1981. Canopy temperature as a crop water stress indicator. Water Resources Research 17:1133-1138.
5. Kirnak, H. 1998. Developing a Theoretical Basis for Demand Irrigation of Acer Rubrum, Ph.D. dissertation, The Ohio State University, December 12 1998, OSU press, Columbus, OH., 210.
6. Montero, J. I., T. H. Short, R. B. Curry and W. L. Bauerle, 1981. Influence of evaporation cooling systems on greenhouse environment. ASAE paper no. 81-4027. St. Joseph, MI:ASAE.
7. Monteith, J. L. 1975. Principles of environmentai physics, Edward Arnold, London.
8. Oke, T.R. (1987). Boundary Layer Climates, Methuen Co. Ltd., Second edition, London, 659.

9. Pang, T., R. P. Fynn, R. D. Fox and T. H. Short, 1992. Biophysical Behavior Under Heat Stress for New Guinea Impatiens, An ASAE Meeting Presentation, ASAE paper no: 927503.
10. Pang, T. 1992. Dynamic Analyis of Water and Nutrient Uptake for New Guinea Impatiens, Ph.D. dissertation, The Ohio State University, OSU press, Columbus, OH., 152.
11. Penman, H. L. 1948. Natural Evapotranspiration From Open Water, Bare Soil and Grass, Proc. Roy. Soc., 193, London, 175.
12. Short, T. H., A. Irvem and R. C. Hansen, 1997. Dynamic Transpiration of Highly-Stressed Container-Grown Acer Rubrum, An ASAE Meeting Presentation, ASAE paper no: 975003.
13. Salisbury, F. B. 1979. Temperature. In Controlled Environment Guidelines for Plant Research, eds. T.W. Tibbitts and T.T. Kozlowski, 75-116, New York: Academic Press.
14. Stanghellini, C. 1987. An Aide to Climate Management, Transpiration of Greenhouse Crops, Wageningen, Elsevier Sci. Publishers, 1-45.
15. Yang, X., T. H. Short, R. D. Fox and W. L. Bauerle , 1989. The microclimate and transpiration of a greenhouse cucumber crop, Transactions of the ASAE. 32(6),2143-2149.
16. Yang, X., T. H. Short, R. D. Fox and W. L. Bauerle, 1990a.Transpiration, Leaf Temperature and Stomatal Resistance of a Greenhouse Cucumber Crop, Agricultural and Forest Meteorology, 51,197-209.
17. Yang, X., T. H. Short, R. D. Fox and W. L. Bauerle , 1990b. Plant Architectural Parameters of a Greenhouse Cucumber Crop, Agricultural and Forest Meteorology, 51, 197-209.