Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

Copyright © Wydawnictwo Akademii Rolniczej we Wroclawiu, ISSN 1505-0297

Rosa R. , Jabłońska-Ceglarek R. 2009. THE EFFECT OF GREEN FERTILIZERS IN THE FORM OF FORECROPS ON THE CONTENT OF SELECTED ELEMENTS OF NUTRITIONAL VALUE IN LEEK (Allium ampeloprasum spp. porrum) cv.'Blizzard', EJPAU 12(1/volume12), #01.
Available Online: http://www.ejpau.media.pl/volume12/issue1/volume12/abs-01.html

ABSTRACT

The experiment was conducted in the years 2003-2005.
The purpose of the undertaken studies was, among others, to determine the consecutive
effect of forecrop green fertilizers on the content of dry weight, total sugars
and reduction sugars, L-ascorbic acid and protein in the utilized parts of leek,
'Blizzard' cv. Leek was cultivated in the second year after applying organic
fertilization. Sugar maize grown directly after ploughing in organic fertilizers
was the forecrop for leek. Plants for green manure (oats, field pea, common vetch
and mixtures of those plants) were sown at the beginning of April and ploughed
over in the first days of June of 2002-2004. The consecutive effect of green
fertilizers was compared with the effect of manure in the dose of 25 t ha^-1,
which was ploughed over in the same date as green fertilizers. The studies found
out significant differences in the content of dry weight, total sugars and reductions
sugars as well as protein in leek depending on the year of cultivation. The greatest
amount of sugars and protein was found in leek in 2003, and the greatest amount
of dry weight – in the years 2003 and 2005. Green fertilizers had a similar or
more positive consecutive effect on the content of the studied elements of nutritional
value in leek. Green fertilizer of oats ploughed under sugar maize caused a significant
increase of the content of dry weight in leek as compared to fertilization with
manure and green fertilizer of common vetch. Ploughing in the green fertilizer
in the form of a mixture of oats with common vetch, on the other hand, had a
more positive consecutive effect than the catch crop of oats on the accumulation
of reduction sugars by leek. More reduction sugars were also found in the leek
cultivated in the combinations with catch crops ploughed over as a whole than
only with aftercrop residue. The cultivation of leek in the second year after
ploughing over the biomass of a mixture of oats with field pea and vetch had
the most positive effect on the accumulation of L-ascorbic acid and protein.

Key words: green fertilizers, manure, leek, dry weight, L-ascorbic acid, sugars, protein.

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Robert Rosa
Department of Vegetable Crops,
Podlasie University in Siedlce, Poland
14 B. Prusa Street, 08-110 Siedlce, Poland
Phone: (+48 25) 643 12 76
email: robro@ap.siedlce.pl

Romualda Jabłońska-Ceglarek
Department of Vegetable Crops,
Podlasie University in Siedlce, Poland
14 B. Prusa Street, 08-110 Siedlce, Poland
Phone: (+48 25) 643 12 76
email: rjablon@ap.siedlce.pl

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Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.

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