Arslan et al.: Assessment of performances of yield and factors affecting the yield in some soybean varieties/lines grown under semiarid climate conditions -4289 -

The aim of this study was to determine the drought stress resistance of three chickpea cultivars (Inci, Hasanbey and Seçkin) grown under water deficit conditions and to discuss the use of yield, crop water stress index and chlorophyll index values as drought stress tolerance indicators in breeding studies. Three drought stress levels, (full irrigation = no stress - I100, deficit irrigation = moderate stress - I50, and no irrigation = severe stress - I0) were used as irrigation treatments. The highest seed yield (1,984 kg ha−1) in severe stress conditions was recorded for the Inci cultivar with a low crop water stress index (CWSI) (0.50) and high chlorophyll index (33.60 SPAD). The lowest seed yield (1,783.66 kg ha−1) in I0treatment was noted for the Seçkin cultivar which had a high CWSI (0.58) and low chlorophyll index (32.88 SPAD). The highest seed yield (2,566.33 kg ha−1) in full irrigation was recorded for the Inci cultivar which had a low CWSI (0.19) and high chlorophyll index (44.39 SPAD), while the lowest seed yield (2,328.00 kg ha−1) in I100 treatment was recorded for the Seçkin cultivar which had a high CWSI (0.26) and low chlorophyll index (42.12 SPAD). The seed yield of the Hasanbey cultivar in both severe stress (1,893 kg ha−1) and full irrigation (2,424.00 kg ha−1) conditions was between Inci and Seçkin varieties. The chlorophyll index and yield had a significant positive (r = 0.877) correlation, while a significant negative (r = −0.90) relationship was determined between CWSI and yield. Seed yield of the Inci cultivar in I0and I100treatments and water use efficiency revealed that the Inci cultivar is resistant to drought stress. Therefore, the Inci cultivar can be used in drought stress tolerance studies. In addition, the CWSI and chlorophyll index values can be employed as resistance indicators in chickpea breeding studies to determine the drought resistant chickpea cultivars.

Öz Bu araştırma, Harran Ovası koşullarında farklı dönemlerde yapılan sulama uygulamalarının aspir bitkisinin verimi ve ürün kalitesi üzerine etkisini belirlemek ve araştırma bölgesinde yetiştirilen aspir bitkisi için uygun sulama programını belirlemek amacıyla,

Phosphorus (P) is a critical nutrient that plays an essential role in improving soil fertility for optimum plant growth and productivity. It is one of the most deficient macro-nutrients in agricultural soils after nitrogen and is considered inadequate for plant growth and production. To P availability in soils, the farmers are applying huge amounts of synthetic P fertilizers that adversely affect the wider environment, groundwater, soil fertility and microbial population. Many beneficial microbes are known to release and supply soluble P for improving growth and yield of a variety of plants in a sustainable manner in P deficient soils. Thus, inoculation of these microbes, including arbuscular mycorrhizal fungi (AMF) and phosphate solubilizing bacteria (PSB) to soil to enhance crop production without harming the environment, is an alternative approach to chemical fertilizers. The combined role of AMF and PSB in P solubilization is not well understood and the application and mode of action of these microbial groups are often naive due to variation in the environment. Therefore, the current review article would develop a better understanding of the interactive role and mechanisms of AMF and PSB in improving P availability from both organic and inorganic sources in a sustainable crop production system. Finally, the current review would loop out further avenues for researchers interested to commercially produce effective AMF and PSB-based biofertilizers for sustainable management of phosphorus over a wide range of agricultural crops worldwide.

Susam bitkisinde üç ve tek kapsüllülük olgusu altında yatan agronomik mekanizmaları belirlemek amacıyla üç kapsüllü (Arslanbey) ve tek kapsüllü (Hatipoğlu) susam çeşitlerinin materyal olarak kullanıldığı bu çalışma 2017 ve 2018 yıllarında Siirt Üniversitesi Ziraat Fakültesi Tarla Bitkileri Bölümü deneme alanında yürütülmüştür. Çalışmada materyal olarak kullanılan susam çeşitlerinden alınan gözlemler; agronomik (bitki boyu, ilk dal yüksekliği, dallanma sayısı, bitkide kapsül sayısı, 1000 tohum ağırlığı ve verim) parametreleri analiz edilmiştir. Çalışma sonucunda; agronomik gözlemlerden her iki yılda da en yüksek değerlere çoğunlukla üç kapsüllü olan Arslanbey susam çeşidi sahip olmuştur.