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The immediate and prolonged (i.e. two and three years after the treatment) effect of fertilizing with organic wastes on the content in tissues and consumption rate of potassium, calcium and manganese by Chenopodium album in various crops, in its varying contribution to the weed biomass was studied. It was found that Chenopodium album share was differentiated in dependence on the combination of fertilization and the cultivated plant. The content of K, Ca and Mg in dry matter depended on the kind of fertilization (before beginning the experiment) and the cultivated plant. The amount of Chenopodium album biomass from each fertilized object most influenced the uptake of those macro elements from an area unit.

The studies were conducted in the third year of two field experiments, in which waste such as: slops, straw, sawdust, sugar factory lime and farmyard manure were applied. Waste was applied once in the first year. The hull-less oats, yellow lupine, as a green fertilizer, and potatoes were the forecrop for winter wheat in the first experiment. The chickling vetch and potatoes were the forecrop in the second experiment. In grain and straw samples the content of total and specific protein was determined. Based on the wheat yield (grain and straw) and both protein forms content in it, the protein yield was calculated. It was found that the secondary effect of waste influenced the total protein content stronger than the kind of forecrop and the specific protein content in a smaller degree. All applied waste influenced, in a secondary way, a higher total and specific protein yield. Yellow lupine, used as a fertilizer for winter wheat forecrop had a more positive effect, than chickling vetch straw, the yield of both protein forms.