Turkish Journal of Field Crops

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PARAMETRIC AND NON-PARAMETRIC STABILITY ANALYSES FOR GRAIN YIELD OF BREAD WHEAT (TRITICUM AESTIVUM L) GENOTYPES IN KAHRAMANMARAŞ CONDITIONS OF TURKEY

Mevlut AKCURA, Rukiye KARA, Aydın AKKAYA, Tevrican DOKUYUCU, Fatih KILLI

Abstract

Grain yield of 11 bread wheat genotypes, tested in a randomised complete block design with 3 replications over 6 years under Kahramanmaraş conditions was analysed by using seven parametric and 2 non-parametric stability criteria. The objectives were to assess genotype by environment interactions and to determine stable genotypes. The fallowing nine stability statistics were calculated: Eberhart and Russell's (1966) regression coefficient (bi) and deviation from regression (S2di), Pinthus's (1973) coefficients of determination (Ri2), Francis and Kannenberg's (1978) coefficient of variability (CVi) and genotypic variance (Si2), Tai's (1971) environmental effects () and deviation from the linear response (), Nassar and Huehn's (1987) ranks over environments (Si(2)), mean of absolute rank differences (Si(1)). Furthermore, three-dimensional plots of mean response versus each parametric stability statistic and two-dimensional plots of mean grain yield versus non-parametric stability statistics were shown to visually evaluate the yield potential and stability estimates of the genotypes. According to these stability parameters genotype 2 (URES/BOW"S") was the most stable genotype for grain yield.

Keyword: genotype by environment interaction, bread wheat, Triticum aestivum L. grain yield, stability, three-dimensional plot, two-dimensional plot ,
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Effects of Different Water Stress Levels on Biomass Yield and Agronomic Traits of Switchgrass (Panicum virgatum L.) Varieties under Semi-Arid Conditio

Erdal GONULAL, Suleyman SOYLU, Mehmet SAHIN

Abstract

A field experiment was conducted in the Wielkopolska region at the Gorzyń Research Station, Poland (52.34°N, 15.54°E) in Central Europe. The study was conducted over a 3-year period (2017, 2018, 2019) as a two-factorial design with four replications in the RCBD. The aim of the research was to determine the effect of the cultivar (‘Bolero’, ‘Tytan’) and the inoculation (Nitragina–seeds inoculation, Nitroflora I–seeds inoculation, Nitroflora II–soil inoculation, HiStick® Lupin–seeds inoculation) on plant development, seeds chemical composition and yielding of narrow-leaved lupin. The weather conditions and experimental factors significantly influenced on productivity of narrow-leaved lupin ‘Tytan’. Drought during the growing season reduced seeds and protein yields. After inoculation of HiStck the seeds yield was significantly greater by 12.4% (p < 0.01) and the protein yield after application of Nitroflora I or HiStick by 13.9% (p < 0.01) and 19.2% (p < 0.01), respectively. Correlation coefficients showed strong relations between number of pods and seeds per plant in both cultivars regardless of the inoculation variant, however the strongest relations in both cultivar were proved on HiStick treatment.
Keyword: Biological nitrogen fixation, chemical composition, legumes, protein efficiency, yielding
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