>Soils naturally contain nitrates. The use of organic or chemical
>fertilizers notably increase their concentration. Nitrosamines, that
>result from the decomposition of nitrates, appeared to be carcinogenic
>under experimental conditions

one good reason to check out "the naturel way of farming). Organic
agriculture didn't question the basic attitude that led to chemical farming.
In fact in history the practice of  traditionel "organic agriculture"
depleted the soils to a point where chemical farming became" necessary " to
boost the  tired soils.
Masanobu showed us that, by restoring the naturel fertilisation process, one
can get the highest potential yield possible. Tilling and fertilising
interfere in and stop the naturel process of fertilisation (that makes the
topsoil grow)
Jean-claude