Chemical composition of seeds of 11 field-grown faba bean cultivars in two cultivation periods [Vicia faba]
1994
Karamanos, A.J. | Papadopoulos, G. | Avgoulas, C.E. | Papastylianou, P. (Agricultural Univ. of Athens (Greece))
The chemical composition (major constituents, tannins, macro- and micro-nutrients) of 10 winter- and one spring-type field-grown faba bean (Vicia faba L.) cultivars was studied over two cultivation periods. With the exception of crude protein and iron concentrations, the seasons affected chemical composition significantly. The variation among genotypes was always highly significant and most cultivars exhibited a consistent rank in protein concentration in both seasons. A consistent rank was also observed in the N-free extract, although the values were systematically higher by 7-10 in the second season. This was attributed to the more favorable conditions which prevailed during seed-filling in that Season. Protein and n-free extract were inversely correlated, in accordance with previous work. No consistency in the rank among cultivars was observed for either lipid and fiber content; lipids were higher while fiber was lower in the second season. The latter was explained in terms of the higher values of the N-free extract in that period. Tannin concentration varied between 1.35 percent and 2.3 percent and exhibited a highly significant positive correlation with total ash and negative correlations with N-free extract and seed yield. Total ash concentration was higher in the first season with little variation among cultivars. Potassium and calcium concentrations were substantially higher than those cited in other works with large variation among cultivars, in contrast with phosphorus and magnesium. No consistent rank among the cultivars in the two years was observed for most minerals, except iron. Significant negative correlations were detected between ash and lipids, ash and N-free extract, iron and average seed weight; whereas positive ones were found between ash and fibre, potassium and lipids, potassium and magnesium, potassium and copper, manganese and fiber, and manganese and magnesium
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