Irrigation is one of the most important cultural practices in sustainable cabbage cultivation. While most studies on irrigation in cabbage have focused on conventional deficit irrigation (DI) practices, some plants’ water requirements under the partial root drying (PRD) technique are not yet very clear. In this study, the possible responses of cabbage, such as growth, some quality, yield, yield parameters, water use efficiency (WUE), irrigation water use efficiency (IWUE), and yield response factor (ky), were investigated at four irrigation water levels (125%, 100%, 75%, and 50%) with DI and PRD techniques for 2 years. Irrigation treatments were carried out by the drip irrigation method, and the amount of irrigation water for the control (I-100) was calculated using the measurements taken from the Class-A evaporation container. A total of eight irrigation treatments—four conventional deficit irrigation (I-125, I-100, I-75, I-50) and four partial root drying (PRD-125, PRD-100, PRD75, PRD-50)—were considered in the study. ET values were determined between 47.69–60.78 mm in the first year and 80.11–101.37 mm in the second year. Total and marketable yield values, WUE and IWUE values, were significantly affected by the irrigation treatments. As a result of the research, the highest total and marketable yields were found in I-125, PRD-125, I-100, and PRD-100 treatments. It was important that WUE and IWUE values reached their highest levels in full irrigation and 25% more irrigation treatments as well as in deficit irrigation treatments. In conditions where irrigation water is scarce and expensive, I-75 and PRD-75 applications are also recommended. While an increase in cabbage head height and diameter was observed with increasing irrigation water level, SSC and L values increased at deficit irrigations. According to the correlation coefficients, a positive relationship was determined between marketable yield and head and stem diameter, head height, WUE, and ET for marketable yield. In addition, it was predicted that I-50 and PRD-50 treatments may also be advantageous if the “kc” plant coefficient cover percentage was increased.

In this study, the traditional full/deficit irrigation and partial root drying (F-PRD) techniques with the four different amounts of irrigation (100%, 80%, 60% and 40%) were examined on Rubygem Strawberry species under controlled greenhouse conditions, in terms of yield, yield parameters, WUE, IWUE, yield response factor (ky), etc. and their possible reactions have been investigated. In the study in which fresh seedlings were used, planted on the rows in a triangular form at intervals of 20×20 cm in double rows. Irrigation applications were carried out by drip irrigation method and the amount of irrigation water in the control treatment (I100) was calculated using measurements taken from an A-Class evaporation pan. Eight irrigation treatments including four traditional irrigation (I100, I80, I60, I40) and four fixed-partial root drying (F-PRD100, F-PRD80, F-PRD60, F-PRD40) were examined within the scope of the study. In traditional irrigation (I100, I80, I60, I40) applications, both sides of the plant root zone were irrigated. However, during the entire growing season in the fixed-partial root drying (F-PRD100, F-PRD80, F-PRD60, F-PRD40) technique, one-half of the plant root zone was kept wet, and the other half was left relatively dry. The yield values were ranked as, from high to low, F-PRD100>I100>F-PRD80>I80>F-PRD60>I60>I40>F-PRD40. In irrigation treatments, the yield values obtained from I80 and F-PRD80 treatments were statistically similar (Duncan 5%) to the yield values of I100 and F-PRD100 treatments. However, it could be stated that the F-PRD80 is more advantageous. It was found that different amounts of irrigation water (100%, 80%, 60% and 40%) affects the yield and yield-related parameters obtained from the strawberry plants. In general, as the water deficit increased (in the I40 and F-PRD40 treatments), the level of negative impact also increased. As a result of the research, F-PRD80 was proposed for the cultivation of strawberries, particularly, in arid and semi-arid regions, depending on the availability of water.

This research was carried out in two separate periods (spring and autumn) in 2018 to reveal the lettuce response of yield, some quality, and plant nutrient content under different water stress conditions. In the study, the effects of different irrigation levels applied with traditional deficit irrigation (TI) and partial rootzone drying (PRD) techniques on lettuce growing were investigated. Lettuce (Lactuca sativa var. crispa cv. ‘Campania’) was used as plant material. There were traditional farmers’ method of irrigation (TF), 125% traditional irrigation (TI-125), 100% traditional irrigation (TI-100), 75% traditional irrigation (TI-75), 50% traditional irrigation (TI-50), 125% partial root-zone drying technique (PRD-125), 100% partial root-zone drying technique (PRD-100), 75% partial root-zone drying technique (PRD-75), 50% partial root-zone drying (PRD-50) technique treatments. According to the results of the research, it was determined that different water stress applications were effective on the criteria examined in lettuce. The highest total and marketable yield values were obtained from the TF application, the second-highest values from the TI-125 application, and the lowest yield from the PRD-50 in the autumn period. In the spring season, the lowest yield was obtained from TI-50 and PRD-50 applications. Based on the treatments, the yield values were decreased and changes were experienced with the increase of the water stress in other examined criteria.

Bu araştırmada, serada yetiştirilen hıyar bitkisinin yarı ıslatmalı sulama (YIS) ve geleneksel kısıntılı sulamaya (KS) tepkisinin belirlenmesi amaçlanmıştır. Çalışma, Türkiye’nin güneyinde Antalya koşullarında plastik örtülü ve cam olmak üzere iki farklı serada yürütülmüştür. Kontrol konu (K100) ile birlikte iki geleneksel kısıntılı sulama (KS75 ve KS50), ardışık-yarı ıslatmalı sulama (A-YIS75 ve A-YIS50) ve sabit-yarı ıslatmalı sulama (S-YIS75 ve S-YIS50) olmak üzere yedi sulama konusu ele alınmıştır. Sulama suyu (mm), verim (t ha-1), bitki boyu (cm), kuru madde vb gözlem ve ölçümler yapılmıştır. Sulama suyu kullanım randımanı (SSKR) değerleri (kg (ha×mm)-1) hesaplanmıştır. Beklenildiği gibi, K100 kontrol konusu toprak su içeriği en yüksek değerlerde ve tarla kapasitesi yakın bir seyir izlemiştir. Diğer konularda ise bitki kök bölgesi toprak su içeriği K100 konusundan daha düşük düzeyde kalmıştır. Toplam verim değerlerinin istatistiksel analizi sonucu Tukey’s %5 düzeyinde sulama konuları arasındaki fark önemli bulunmuştur. İlk yıl K100, KS75, S-YIS75, A-YIS75 ve A-YIS50 konuları istatistiki olarak en yüksek verim değerlerinde yer almış ve aralarında istatistiki olarak bir fark bulunmamıştır. Yine ilk yıl, S-YIS50 ve KS50 konuları ise istatistiki olarak en düşük verim değerlerine sahip olmuştur. İkinci yıl, birinci yıla benzer bir şekilde ancak, sadece K100 ve S-YIS75 konuları istatistiki olarak en yüksek verim değerlerine sahip olmuş ve aralarında istatistiki olarak bir fark bulunmamıştır. Yine ikinci yıl, KS50 konusu istatistiki olarak en düşük verim değerine sahip olmuştur. SSKR değeri her iki yıl en yüksek A-YIS50 konusunda hesaplanmıştır. En düşük SSKR değeri ise birinci yıl KS50, ikinci yıl ise A-YIS75 konularında belirlenmiştir. Araştırmada, genel olarak, sulama suyunun kısıntı düzeyi artıkça verimde azalma saptanmıştır. Sulama suyundan tasarruf sağlamaya yönelik araştırmalar özellikle suyun kıt ve pahalı olduğu kurak ve yarı kurak bölgelerde önemini gittikçe artırmaktadır. Bu bağlamda, verimdeki düşüşün sulama suyundaki azalma oranından daha küçük kalması, YIS konularının bir avantajı olarak görülebilir.

As it is known, drought is one of the most important issues of recent years. On the other hand, agriculture is the sector that uses the most water. The impact of drought can be reduced by reducing the water used in agriculture. Therefore, it is very important to determine the application time and amount of irrigation water for a successful agricultural irrigation management. One of the most important ways to achieve this success is to accurately determine and monitor the water content in the plant root zone. Soil water content can be determined in two ways; direct and indirect methods. The direct measurement method is tedious, laborious and time consuming. Instead, a large number of indirect measurement methods are developed. One of these indirect measurement methods is the PR2 Profile Probe method. In this study, the possibilities of using PR2 method under different soil water content conditions were investigated. First, the calibration of the PR2 method was made within 40 cm of soil depth. Then, the water content in the soil was monitored by the PR2 method under three different soil water content (100%, 75% and 50%) conditions. R2 values for calibration relationships varied between 0.7947 and 0.9305. In the study, it was concluded that soil water content could be monitored with PR2 Profile Probe.