Turkish Journal of Field Crops

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COMPARISON OF METHODS FOR DRY MATTER CONTENT DETERMINATION IN POTATO USING MULTI-ENVIRONMENTS FIELD DATA AND STABILITY STATISTICS

Muhammad NAEEM, Mehmet Emin CALISKAN

Abstract

Tuber dry matter content (TDM) is considered as the main determinant of processed potato tuber quality. In order to investigate rapid, practicable and reliable methods for the measurement of TDM, a study was planned to compare three standard methods (digital potato hydrometer, moisture-drying on quartz seasand and oven-dry) among 189 diverse potato genotypes, grown under three environmental conditions (Hatay “standard water application”, Konya “standard water application” and Konya “drought” conditions). ANOVA revealed highly significant differences (p<0.01) in all treatments among tests, checks and tests vs check genotypes. Environmental conditions significantly affect the TDM, while methods showed differential response within the tested environments. A strong correlation (r) and high goodness of fit (R2 ) was observed between seasand and hydrometer methods as compared to oven-dry method. Wide applicability and reliability of seasand and hydrometer methods were also confirmed by stability statistics. This study recommends seasand as an accurate and hydrometers as rapid method in contrast to oven dry method for the measurement of TDM. Parametric stability methods such as bi and S 2 di identified stable genotypes with optimum TDM, that can serve as a useful resource for breeding of processing cultivars. ><0.01) in all treatments among tests, checks and tests vs check genotypes. Environmental conditions significantly affect the TDM, while methods showed differential response within the tested environments. A strong correlation (r) and high goodness of fit (R2 ) was observed between seasand and hydrometer methods as compared to oven-dry method. Wide applicability and reliability of seasand and hydrometer methods were also confirmed by stability statistics. This study recommends seasand as an accurate and hydrometers as rapid method in contrast to oven dry method for the measurement of TDM. Parametric stability methods such as bi and S 2 di identified stable genotypes with optimum TDM, that can serve as a useful resource for breeding of processing cultivars.

Keyword: Hydrometer, potato, oven-dry, seasand method, stability, tuber dry matter content ,
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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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