Folia Horticulturae

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Successive effect of green manures in form of forecrops in cultivation of onion

Romualda Jabłońska-Ceglarek, Robert Rosa, Anna Zaniewicz-Bajkowska, Jolanta Franczuk

Department of Vegetable Crops
The University of Podlasie
Prusa 14, 08-110 Siedlce, Poland

The secondary effect of green manure in the form of forecrop plants (oat, field pea, vetch, and mixtures of these plants) on the yield of onion and the content of dry matter, monosaccharides, total sugars and, vitamin C, was examined. Two forms of forecrop usage were applied, namely the whole biomass and harvest residue. The fertilizing effect of forecrops was compared to the dose of 25 t ha-1 of farmyard manure and the cultivation without it. Onion was cultivated in the second year after organic fertilization. Forecrop green manure positively affected onion yielding. The highest yield was obtained after ploughing in field pea. The dry matter content was the highest in the case of the onion cultivated after vetch and farmyard manure. The application of green manure resulted in a higher accumulation of monosaccharides and total sugars in onion in comparison with the cultivation after farmyard manure and a control unit without organic fertilization. The onion cultivated after the mixtures of vetch and field pea as well as of vetch, oat and field pea, was the richest in sugars. The onion grown after vetch and the mixture of oat and field pea showed the highest level of vitamin C.

Jabłońska-Ceglarek R., Rosa R., Zaniewicz-Bajkowska A., Franczuk J., 2002. Successive effect of green manures in form of forecrops in cultivation of onion. Folia Horticulturae 14/1: 3-12.