Leaf temperature has long been recognized as an indicator of water availability. The stress level in a plant can be quantified from leaf temperature by using the crop water stress index (CWSI). In this study, it was investigated whether infrared thermometer measurements and accordingly CWSI could be used to create irrigation schedules for olive trees (cultivated variety Memecik). The research was conducted at the olive tree plantation of the Olive Research Station between 2009 and 2010. In the study, the effects of different irrigation treatments on the yield, canopy temperature, and CWSI of olive trees were investigated, and the optimum irrigation schedule was determined according to the findings. Seven different water application treatments were created using the drip irrigation method. Five treatments consisted of irrigating at a rate equivalent to 25% (S-0.25), 50% (S-0.50), 75% (S-0.75), 100% (S-1.00), and 125% (S-1.25) of the cumulative evaporation in 5 days from a Class A evaporation pan. T...

Aims: Rice is one of the most applied irrigation waters applied plant among cultivated plants since it is grown in water or in saturated soil conditions in a significant portion of the growing season. This study was aimed to determine the effects of rice grown on water use, development, yield and some yield parameters using of both separately and jointly water retention barriers and subsurface drip irrigation methods in Enez, Edirne, Turkey in 2017.Methods and Results: Four different treatments were applied: ponding ((control(C)), subsurface drip irrigation system (SDI), ponding + water retention barrier (C+WRB) and SDI+WRB in this study. Subsurface drip irrigation laterals were placed 10 cm deep from the soil surface and the WRB was placed at 30 cm deep. Plants were irrigated with a constant water height of 10-15 cm on the soil in C and C+WRB treatments, 20% ± 5% of the available water retention capacity is consumed without exposure to water stress in SDI and SDI+WRB treatments, the field capacity is completed. WRB and SDI applications significantly affected the irrigation water amount, grain yield and yield components of rice. The yield and irrigation water amount according to the treatments varied between 321-715 kg da-1 and 751-2444 mm, respectively. Conclusions: In comparison to the control treatment, water saving was achieved by 27%, 50%, 69% in C+WRB, SDI and SDI + WRB treatments, respectively. Despite this, when marketable yield values are analysed according to the control treatment, it has increased by 10.8% in C+WRB, and decreased by 48.8% and 40.7% in SDI and SDI + WRB treatments. The water retention barriers and subsurface drip irrigation practices used in the study have been shown to reduce the use of irrigation water in rice production.Significance and Impact of the Study: It can be said that these methods have the potential to be used especially in arid and semi-arid regions where water is limited or inadequate.

Bu çalışmada; domates (Lycopersicum esculentum L. cv Full F1) bitkisinde, bitki su stresi indeksi (CWSI) ve Normalize Edilmiş Vejetatif Değişim İndeksi (NDVI) sensöründen elde edilen veriler kullanılarak su stresi düzeyinin, ayrıca CWSI ve NDVI değerleri ile bitkinin bazı fizyolojik özellikleri (stoma iletkenliği, yaprak su potansiyeli, yaprak oransal su içeriği ve klorofil) arasındaki ilişkilerin belirlenmesi amaçlanmıştır. Çanakkale ilinde 2017 yılında yürütülen çalışmada dört farklı sulama konusu (%100, %75, %50 ve %25) ele alınmıştır. Çalışma sonucunda, uzaktan algılama indekslerinin her ikisi de su stresi karşısında belirgin tepkiler vermiştir. Bu durumda her iki indeks de kullanılarak domatesin su stresinin başarılı bir şekilde belirlenebileceği söylenebilir. Buna ilaveten ölçümü zor, zaman alıcı ve bitkiye zarar verebilen fizyolojik ölçümlerin CWSI ve NDVI değerlerinin her ikisini de kullanarak yüksek doğrulukla tahmin edilebileceği sonucuna varılmıştır.

The effect of different irrigation treatments on the quality and antioxidant compounds of the virgin olive oil obtained from Memecik variety was determined in this study, which was carried out in three consecutive years. For this purpose, six different irrigation treatments (25%, 50%, 75%, 100% and 125%) were applied to an olive orchard using the drip method. According to quality criteria, free acidity and peroxide value were not influenced by the amount of irrigation. Differences in fatty acids among oil samples were found statistically significant. Among the hydroxytyrosol, gallic acid, oleuropein, chlorogenic acid, caffeic acid, vanillic acid, p-coumaric acid, ferulic acid, luteolin and apigenin, hydroxytyrosol and vanillic acid were influenced by the amount of irrigation water applied to olive trees, and there was a significant relationship among the irrigation treatments. Generally, an increase in the amount of irrigation water given was accompanied by a reduction in bitterness indices and total chlorophyll contents. In terms of oil yield and chemical quality, 25% irrigation treatment could be recommended under experimental conditions.

Çalışmada, termografi tekniği ile hesaplanan indeksler kullanılarak biberde su stresinin ve bu indeksler ile bazı fizyolojik özelliklerin belirlenmesi hedeflenmiştir. 2017 yılında Çanakkale’de dört farklı sulama konusundan (S100, S75, S50 ve S25) oluşan bir deneme yürütülmüştür. Çalışmadan elde edilen sonuçlara göre, uygulanan sulama konularından termal indeksler ve tüm fizyolojik özellikler etkilenmiştir. Termal kamera yardımıyla bitki düzeyindeki ölçümlerden ampirik olarak belirlenen bitki su stresi indeksi (CWSIe) verilen sulama suyundaki azalışa bağlı olarak artmış, stoma iletkenliği indeksi (IGe) ise azalmıştır. Sınıflama ve regresyon ağacı analizine göre, CWSIe’nin sulamaya başlama zamanını belirlemek amacıyla kullanımının yeterli olduğu söylenebilir. Bu durumda söz konusu indeksin eşik değeri 0.42 alınabilir. Termal indeksler ile fizyolojik özellikler arasında her bir büyüme dönemi için yapılan regresyon analizi sonuçlarına göre oldukça önemli ilişkiler elde edilmiştir. Söz konusu ilişkiler çiçeklenme döneminden sonra artış göstermiştir. Çalışmanın sonucu olarak su stresini ayırt etmedeki başarısı ve uygulamadaki kolaylığı nedeni ile biber bitkisinde uzaktan algılama tekniklerinden biri olan termografi tekniği ile elde edilen indekslerin kullanımı önerilebilir. Çalışma, termal görüntülerden yararlanarak biber bitkisinde su stresinin hızlı ve doğru bir şekilde belirlenebilme potansiyeli olduğunu göstermiştir.