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Porównano zawartość azotanów i metali ciężkich w ziemniakach i warzywach z gospodarstw ekologicznych i konwencjonalnych położonych na terenie dawnego woj. kieleckiego. Badania prowadzono w latach 1994-1997. Wykazano, że zawartość azotanów byla w ciągu 4 lat badań ok. dwukrotnie wyższa w ziemiopłodach konwencjonalnych (KONW) niż w ziemiopłodach ekologicznych (EKO). Zawartość kadmu była z reguły istotnie wyższa w ziemiopłodach EKO niż KONW. Zawartość ołowiu i cynku we wszystkich latach badań była z reguły zbliżona w ziemiopłodach EKO i KONW. Zawartość metali ciężkich z reguły nie przekraczała NDZ. Stwierdzono bardzo wyraźną dodatnią korelację między zawartością cynku i kadmu w badanych ziemiopłodach.
The aim of this work was to compare the wholesomeness of the agricultural products from the organic and conventional farms. The authors of this study made use of the results of organic farm product monitoring conducted by the Gliwice Department of the Polish Ecologists Association in 1994- 1997, and of the routine conventional farm products monitoring continued by the Regional Chemical/Agricultural Station of Kielce. The studied farms were located in the same region, but in different villages, and the monitoring was simultaneous but independent. Nitrate, cadmium, lead and zinc contents of potato, carrot, beetroot, parsley and celery were monitored. The results show that, in the studied 4-year period, nitrate levels in the conventional farm products were about twice as high as those in the organic farm products; for all vegetables (except celery) the difference was statistically significant. The 4-year mean nitrate content of any studied vegetable did not exceed the maximum admissible residue (NDP) specified by the 1993 Ordinance of the Minister of Health and Social Welfare. Cadmium content was significantly higher in the natural than in the conventional farm products, but for both remained within the maximum admissible content (NDZ) values specified by the 1993 Ordinance. The organic and conventional celery had similar high cadmium content, which was higher than the NDZ value. Lead content was significantly higher in the organic beetroot and celery than in those from the conventional farms, while it was similar in other studied vegetables. Mean lead content of all studied products was well below the NDZ value. Zinc content was higher in all studied organic farm products, and the organic to conventional difference was statistically significant for beetroot and potato. However, mean zinc content of any studied products did not exceed 50% NDZ. There was an evident, strong positive correlation between zinc and cadmium content of all studied farm products; the positive correlation was nearly as strong between lead and zinc, and cadmium and lead levels. Our results indicate that the sanitary quality of the tested products from the organic farms is superior for nitrate, inferior for cadmium, and similar for lead and zinc content compared to the corresponding products grown in the conventional farms. Considering the higher cadmium content of the organic farm products, it seems advisable to reduce the admissible soil cadmium content from current 2 mg/kg air-dry soil to between 0.3 mg/kg and 1 mg/kg, depending on soil type. Products from the organic farms should be tested at regular intervals for their content of cadmium and other contaminants.
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s.49-57,tab.,bibliogr.
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- Szkola Glowna Gospodarstwa Wiejskiego, ul.Nowoursynowska 166, 02-787 Warszawa
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autor
Bibliografia
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Bibliografia
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bwmeta1.element.agro-article-1b02ecde-4862-4919-b8a0-e70d485add54
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