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Author(s): Mihaela Lungu | Lucian Stoian | Marcela Fălticeanu | Mihaela Monica Aldea | Rodica Doina Lazăr | Monica Dumitraşcu

Journal: Present Environment and Sustainable Development
ISSN 1843-5971

Volume: 2;
Issue: 1;
Start page: 233;
Date: 2008;
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Keywords: nutritional state | ecological vegetables | leaves cellular sap pH

The contents of mineral nutritional elements in vegetables’ leaves were studied in an ecologically assessed field at the Research-Development Station for Vegetables (SCDL) Bacău, on a Fluvisol, in 2006 and 2007. Soil texture is sandyloamy, pH 6.2-6.8, and the humus content 2.4-2.6%. Vegetables have been grown here for several tens of years. In the last years, in an ecological agriculture system, the soil has been fertilized only with farm-made compost and green manure. Organic fertilization didn’t significantly improve the nutritive elements soil contents but it had the merit to preserve the soil fertility properties, along with the natural equilibrium between nutritional elements. Under these conditions, lower total nitrogen contents were determined in tomato leaves and higher in egg-plant leaves. Phosphorus contents proved to be relatively constant with egg-plants and a little lower with tomatoes; potassium and calcium contents were much lower with tomatoes; zinc and copper contents registered depletions, both for egg-plants and tomatoes, the iron contents slightly increased, while manganese contents remained relatively constant. In 2007 the potassium contents in tomatoes leaves shifted towards the critical domain, as compared to the lower limit of the excessive domain in 2006, in egg-plants leaves it remained under this domain limit, as in 2006; the calcium contents remained in the excessive domain, as in 2006, the magnesium contents shifted towards the critical domain, as compared to the normal one in 2006, iron contents remained excessive for tomatoes; the zinc remained in the normal content domain for tomatoes, as in 2006, and decreased to the critical domain for egg-plants; the copper remained in the excessive content domain, but at the inferior limit of it, unlike in 2006. Due to these modifications of ratios between the mineral nutritional elements absorbed in leaves in 2007 the cellular sap pH values were lower than in 2006.
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