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The effect of different rates and methods of fertilizer nitrogen application and potassium nutrition on the root nodule formation of faba bean plants var. Nadwiślański and on their nitrogenase activity was studied. It was found that fertilizer N depressed the nodule formation and nitrogenase activity, but inhibitory effect of N was smaller when it was supplied to the leaves instead to the soil. Plants growing at higher K level were in a position allowing on better development of nodules and consequently higher N₂₋ fixation.
The objective of this study was to determine the effects of measuring errors on the accuracy of diffusion coefficient estimation as dependent on the method used. The estimation was based on a numerical solution of the inverse function, and inverse problem solving. The analysis concerned results of convective drying of faba bean seeds. The seeds, with an initial moisture content M0=0.240 kgwater/kgdb were dried at 15, 20, 25, 30 and 35°C. The results obtained in the study show that the method based on inverse problem solving is more effective at extreme moisture levels (Θ ≈ 0 and Θ ≈ Θk). This method, used for simulating successive replications, enables to acquire information not only on estimated values of the diffusion coefficient and measuring errors, but also on their distribution.
The aim of the study was to determine the content and biological activity of phenolic compounds of three faba bean genotypes - a coloured flowered Nadwiślański variety, a coloured flowered "self-ending" Tinos variety and white flowered Caspar variety. Comparing the white flowered Caspar variety containing 0.34% of phenolic compounds in the seed coat, in this proantho- cyanidins made from 0.04%, the Polish Nadwiślański and Tinos variety were characterised as having a higher phenolic compound content in the seed coat, i.e. 8.70% and 11.75%, respectively. The proanthocyanidins content, being 6.54% and 8.32% respectively, is in accordance with the lower values determined in the seed coats of many European high-tannin faba bean varieties. Seed coats containing a higher level of polyphenols, added to casein diets in amounts of 15%, highly significantly lowered the digestibility and protein efficiency. Depending on the variety of seed coat, TD protein coefficients amounted to: Caspar — 85.4%, Nadwiślański — 71.3%, Tinos — 69.3%. For these same diets the NPU index was 71.2, 59.3 and 49.4, and the PER index was 2.63, 2.23 and 2.16, respectively. It was also found highly significant decrease of Ca, Fe, and Zn apparent digestibilities in casein diets with faba bean seed coats of a high polyphenolic content.
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