Ewa Rembialkowska


(organic – conventional) / conventional x 100


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Bog'liq
4-mavzu.Agricultura June 2004

(organic – conventional) / conventional x 100


The collected data for several desirable compounds is presented in a table 1.


Table 1. Compounds and nutrients content of organic versus conventional crops

Compound

Mean % difference

Range

Number of studies

Vitamin C

+ 28.7 %

- 38 % ± 135.5 %

21

Phenolic compounds

+ 119.3 %

- 56,6 % ± 734.2 %

15

Iron

+ 21.1%

- 73 % ± 240 %

16

Magnesium

+29.3%

- 35 % ± 1206 %

17

Phosphorus

+13.6 %

- 44 % ± 240 %

18

Source: Worthington 2001, own calculations

The role of vitamin C in human organism is basic for several metabolic functions, mainly because it provides the proper immune system. The higher content of vitamin C in organic crops has high health importance also because vitamin C inhibits the in-situ formation of the carcinogenic nitrosamines, so diminishes the negative impact of the nitrates on human organism (Mirvish 1993). Therefore the organic vegetables can help in anti – cancer prevention.


Plant-based phenolic metabolites are particularly interesting because of their potential antioxidant activity and medical properties including anti-carcinogenic activity (Brandt and Mølgaard 2001). Mineral compounds, in that iron, magnesium and phosphorus, are fundamental for human health. According to Worthington (2001) the possible reason of higher mineral content in organic crops is connected with higher abundance of micro organisms in organically managed soil. These micro organisms produce many compounds that help plants to combine with soil minerals and make them more available to plant roots.
Unfortunately there are only few studies on other vitamins like ß-carotene, B1 and B2 and the results are contradictory. Therefore no general conclusions can be drawn about these compounds.



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