Nitrate accumulation in different parts of carrot root during vegetation period
2006
Kóňa, J.,Slovenská poľnohospodárska univ. v Nitre (Slovak Republic)
A field trial was conducted to study the dynamics of an accumulation of nitrates in underleaf, middle, root, skin and pith parts of carrot roots during vegetation period over 1989-1991. The Rubina carrot variety grown on gley heavy soil was used for study. Root samples for nitrate content detection were taken in all three studied years from 10th July to 8th October in 1O-day intervals. Distribution of nitrates in various parts of carrot root was not balanced. They were mostly accumulated in conducting tissues (the centre axis - pith in carrot), from 639.3 mg per kg up to 702.9 mg per kg) on average, and in the upper underleaf part, from 605.3 mg per kg to 897.8 mg per kg. The significantly highest content was found in the lower part of root, the so called root tip, where it ranged between 1,264.1 mg per kg and 1,720.7 mg per kg. Nitrate content in the sample of whole carrot was substantially lower, being in a range of 302.5 mg per kg to 449.9 mg per kg. A significant decrease in the nitrate content in carrot can be achieved when the underleaf part of root and root tip are removed. This treatment is recommended to be done mainly in processing carrot in baby food and juices. Root cultivars with a bigger pith also have a higher nitrate content. In carrot breeding it is necessary to focus on the varieties with a smaller pith as well as on those accumulating less nitrates in pith, lower and underleaf parts of root.
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