Abstract. The successive fertilizing effect of forecrop green manures in the carrot cultivation in the second year after plough-down was similar or higher than the farmyard manure effect (25 t·ha^-1). The fertilizing effect of green manures depended on plough-down with the quantity of biomass. Higher yields of carrot were obtained after plough-down as a green manure of whole biomass of intercrop than the post-harvest residues.

The successive effect of green manures in carrot
of ‘Flacoro’ cultivation

Summary

The successive effect of green manure in the form of forecrop plants (oat, field pea, spring vetch and mixtures these of plants) on yield of carrot of ‘Flacoro’ was studied. The plants on the green manure were ploughted-down in whole and in the form of post-harvest residues. They successive fertilizing effect was compared with farmyard manure (25 t·ha^-1) and with cultivation without organic fertilization. Carrot was grown in the second year after organic fertilization.

The whole biomass of intercrop caused a significant increase of carrot yields in comparison with the control object without organic fertilization. The total yield of carrot cultivated in the second year after green manure with oat and mixture with its share was significantly higher in comparison with cultivation after farmyard manure. Introduction into soil of the whole biomass of forecrop plants, except field pea, successively caused a significant increase in the marketable yield of carrot in comparison with cultivation after farmyard manure. In the second year after plough-down of the post-harvest residues of oat and mixtures: oat with field pea, spring vetch with oat and field pea an increase of the marketable yield of carrot in relation to the control without organic fertilization was found. The successive effect of the plough-down of the post-harvest residues of green manure was similar to the farmyard manure effect.