ZESZYT Nr 3 / 2010 Abstrakty Volume No 3/2010 Abstracts |
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| 3.The effect of foliar or soil top-dressing of urea on some physiological processes and seed yield of faba bea - Anna Kocoń Abstract. This research was conducted to determine the infl uence of foliar or soil applied urea fertilizer on symbiotic N2 fi xation, intensity of the net photosynthesis, nitrogen accumulation and seed yield of the faba bean cultivar Nadwiślański. A pot experiment was conducted over two years, in an experimental greenhouse at IUNG-Puławy. Feeding faba beans with urea caused a partial restriction of symbiotic nitrogen fi xation, reduced root nodule mass and nitrogenase activity. This inhibitory effect had a temporary character and was lower when urea was supplied to the leaves than to the soil. Feeding faba bean with urea increased the intensity of the net photosynthesis in leaves, which in turn gave greater plant nitrogen accumulation and increased faba bean seed yield (an average increase of 14–15% for foliar feeding and 2–4% for soil top dressing in comparison with no top dressing). Foliar feeding with urea was found to be more benefi cial than soil topdressing, irrespective of the basic dose of N. key words: faba bean, top-dressing of urea, symbiotic N2 fi xation, photosynthesis, yield |