Halil KIRNAK, Ted H. SHORT

Serada Saks ı da Yetiştirilen New Guinea lmpatiens Bitkisinin Dinamik Transpirasyonu

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

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,

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