Vpliv načina pridelave na vsebnost nitratov v vzorcih solate

Dragan ŽNIDARČIČ, Veronika KMECL

Povzetek


Raba dušikovih gnojil je eden glavnih vplivov kopičenja nitratov v rastlinah. Konvencionalno kmetijstvo, v primerjavi z integriranim in ekološkim kmetijstvom povzroča večje onesnaženje okolja in slabšo kakovost pridelkov. V okviru raziskave smo ugotavljali vpliv načina pridelave na vsebnost nitratov v vzorcih solate (Lactuca sativa L.). Vzorce smo prejeli neposredno iz pridelovalnih površin iz različnih delov Slovenije. V laboratoriju smo vzorce analizirali na vsebnost nitrata (NO3-) po akreditirani metodi. Kot pričakovano, so vzorci iz konvencionalne pridelave pokazali največjo zastopanost vzorcev (51 %), z vrednostmi v najvišjem koncentracijskem območju (1000 – 2500 mg NO3- kg-1 sveže mase, en vzorec je presegel vrednost 2500 mg kg-1). V okviru integrirane pridelave je bilo takšnih vzorcev manj (34 %), izmed vzorcev iz ekološke pridelave pa ni bilo vzorca, ki bi presegel vrednost 1000 mg NO3- kg-1. Izmed 88 analiziranih vzorcev, je en vzorec presegel zakonsko predpisano mejno vrednost, ki velja za solato tipa ledenka ('Ljubljanska ledenka'). V povprečju so vzorci ledenk vsebovali več nitratov, kot druge vrste zelene solate.

Ključne besede


ekološka; konvencionalna; integrirana pridelava; nitrat; solata

Celotno besedilo:

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Literatura


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DOI: http://dx.doi.org/10.14720/aas.2018.111.3.16

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