[Regulation of nitrate acumulation in vegetables]
1995
Pechova, B. | Miklovic, D. (Soil Fertility Research Inst., Bratislava (Slovak Republic))
Changes of the ammonium-N originating from fertilizers, manures and plant remains increase nitrate supply in soil through N-oxidation to nitrite and nitrate. Uptake by plants is influenced by pedo-hydrometeorological conditions. In aerated soil, nitrification takes place with substantially higher intensity. Based on long-term experiments we have balanced organic and mineral fertilization proportions in nitrate accumulation in chosen vegetable varieties. Organic matter in soil has a dominant impact on nitrate level in soil and nitrate accumulation in vegetables. If farmyard manure is not being regularly applied to soil, the vegetable produced may have minimum nitrate levels, but with respect to sustainable soil fertility levels, we recommend regular farmyard manure application at 4-5 year intervals, at rates of 50-60 tons per ha. Tables and figures show nitrate levels in spinach and in soil at spinach harvest, and in late carrot and in soil at carrot harvest
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