The secondary effect of forecrop green manures on the vitamin C and protein content of red beet has been evaluated. Two forms of forecrop usage was applied, namely the whole biomass and harvest residue. Red beets were cultivated in the third year after organic fertilization. The beets that were grown after the mixture of vetch, oat and field pea as well as after oat was the highest in vitamin C. The ploughing under of the whole biomass of forecrop plants more positively influenced the protein content in beets than the ploughing under of the harvest residue alone.

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