Methods to determine solidity and dry matter content of onions (Allium cepa L.)

Abstract

Different testing methods to measure solidity and dry matter content of onion bulbs were examined. The correlation coefficients between the characters determined were calculated. No strong correlations were found between the results of the different methods of measuring solidity. The refraction value of the press juice gives reliable information on the dry matter content of the onion bulb.

Genetic analyses of correlated solids, flavor, and health-enhancing traits in onion (Allium cepa L.)

“…Signi®cant positive genetic and phenotypic correlations were found among SSC, DM%, pungency, and OIAA (Table 3) and agreed with previously reported phenotypic correlations (Mann and Hoyle 1945;Nieuwhof et al 1973;Sinclair et al 1995a;Goldman et al 1996;Debaene et al 1999). Our results provide genetic evidence that high-solids onions have higher pungency and OIAA, as compared to low-solids onions.…”

“…SSC is highly correlated with dry-matter content (Mann and Hoyle 1945;Nieuwhof et al 1973;Sinclair et al 1995a). McCollum (1968) reported a negative genetic correlation between SSC and bulb size.…”

Variability, heritability, and correlations of agronomic traits in an onion landrace and derived S1 lines

“…Dry matter and soluble solids contents were the second pair of significantly correlated traits (0.83), in agreement with previous reports (Mann and Hoyle 1945, Nieuwhof et al 1973, Sinclair et al 1995, Galmarini et al 2001. This positive correlation makes the use of indirect selection by soluble solids content possible; soluble solids content is easier and cheaper to measure than dry matter content for large scale plant material.…”

Yield, Quality and Micronutrients Uptake of Carrot (Daucus carota L.) and some Soil Properties as Affected by Organic Fertilizers and Elemental Sulphur Application

“…The chemical analysis of sugar content per 100 g fresh weight. A drop of juice extracted from root of carrot was used to determine TSS using hand refractometer (Niewhof et al, 1973). Samples of plant were washed by tap water then by distilled water and oven dried at 75°C for 48 hr.…”