A strict field experiment was carried out in 2002-2004 with two yellow lupin cultivars, which were harvested 6 times at the 8-10 leaf phase, at the beginning of budding and flowering, at flat pod, at physiological and full seed maturity, to evaluate the dynamics of fresh weight, dry matter as well as N accumulation in vegetative and generative parts of plants. The significantly highest fresh weight yields in both cultivars were obtained at the flat pod phase, while dry matter yields – at the physiological seed maturity. The maximum productivity of conventional ‘Polo’ cultivar was higher than that of self-completing ‘Legat’ which, due to a faster growth rate from the beginning of emergence to budding and higher dynamics of fresh weight and dry matter as well as N accumulation, can be more useful as an intercrop. The maximum N content in leaves was observed over budding and flowering phases, while in stems – at the beginning of budding. On the day of harvest the share of ‘Polo’ seeds in the total dry matter amounted to 39%, whereas of ‘Legat’ seeds – to 42%.

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