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Soil versus foliar iodine fertilization as a biofortification strategy for field-grown vegetables
Iodine (I) biofortification of vegetables by means of soil and foliar applications was investigated in field experiments on a sandy loam soil. Supply of iodine to the soil in trial plots fertilized with potassium iodide (KI) and potassium iodate directly before planting (0, 1.0, 2.5, 7.5, and 15 kg...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4477264/ https://www.ncbi.nlm.nih.gov/pubmed/26157445 http://dx.doi.org/10.3389/fpls.2015.00450 |
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author | Lawson, Patrick G. Daum, Diemo Czauderna, Roman Meuser, Helmut Härtling, Joachim W. |
author_facet | Lawson, Patrick G. Daum, Diemo Czauderna, Roman Meuser, Helmut Härtling, Joachim W. |
author_sort | Lawson, Patrick G. |
collection | PubMed |
description | Iodine (I) biofortification of vegetables by means of soil and foliar applications was investigated in field experiments on a sandy loam soil. Supply of iodine to the soil in trial plots fertilized with potassium iodide (KI) and potassium iodate directly before planting (0, 1.0, 2.5, 7.5, and 15 kg I ha(-1)) increased the iodine concentration in the edible plant parts. The highest iodine accumulation levels were observed in the first growing season: In butterhead lettuce and kohlrabi the desired iodine content [50–100 μg I (100 g FM)(-1)] was obtained or exceeded at a fertilizer rate of 7.5 kg IO(3)(-)-I ha(-1) without a significant yield reduction or impairment of the marketable quality. In contrast, supplying KI at the same rate resulted in a much lower iodine enrichment and clearly visible growth impairment. Soil applied iodine was phytoavailable only for a short period of time as indicated by a rapid decline of CaCl(2)-extractable iodine in the top soil. Consequently, long-term effects of a one-time iodine soil fertilization could not be observed. A comparison between the soil and the foliar fertilization revealed a better performance of iodine applied aerially to butterhead lettuce, which reached the desired iodine accumulation in edible plant parts at a fertilizer rate of 0.5 kg I(-)-I ha(-1). In contrast, the iodine content in the tuber of sprayed kohlrabi remained far below the targeted range. The results indicate that a sufficient spreading of iodine applied on the edible plant parts is crucial for the efficiency of the foliar approach and leafy vegetables are the more suitable target crops. The low iodine doses needed as well as the easy and inexpensive application may favor the implementation of foliar sprays as the preferred iodine biofortification strategy in practice. |
format | Online Article Text |
id | pubmed-4477264 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-44772642015-07-08 Soil versus foliar iodine fertilization as a biofortification strategy for field-grown vegetables Lawson, Patrick G. Daum, Diemo Czauderna, Roman Meuser, Helmut Härtling, Joachim W. Front Plant Sci Plant Science Iodine (I) biofortification of vegetables by means of soil and foliar applications was investigated in field experiments on a sandy loam soil. Supply of iodine to the soil in trial plots fertilized with potassium iodide (KI) and potassium iodate directly before planting (0, 1.0, 2.5, 7.5, and 15 kg I ha(-1)) increased the iodine concentration in the edible plant parts. The highest iodine accumulation levels were observed in the first growing season: In butterhead lettuce and kohlrabi the desired iodine content [50–100 μg I (100 g FM)(-1)] was obtained or exceeded at a fertilizer rate of 7.5 kg IO(3)(-)-I ha(-1) without a significant yield reduction or impairment of the marketable quality. In contrast, supplying KI at the same rate resulted in a much lower iodine enrichment and clearly visible growth impairment. Soil applied iodine was phytoavailable only for a short period of time as indicated by a rapid decline of CaCl(2)-extractable iodine in the top soil. Consequently, long-term effects of a one-time iodine soil fertilization could not be observed. A comparison between the soil and the foliar fertilization revealed a better performance of iodine applied aerially to butterhead lettuce, which reached the desired iodine accumulation in edible plant parts at a fertilizer rate of 0.5 kg I(-)-I ha(-1). In contrast, the iodine content in the tuber of sprayed kohlrabi remained far below the targeted range. The results indicate that a sufficient spreading of iodine applied on the edible plant parts is crucial for the efficiency of the foliar approach and leafy vegetables are the more suitable target crops. The low iodine doses needed as well as the easy and inexpensive application may favor the implementation of foliar sprays as the preferred iodine biofortification strategy in practice. Frontiers Media S.A. 2015-06-23 /pmc/articles/PMC4477264/ /pubmed/26157445 http://dx.doi.org/10.3389/fpls.2015.00450 Text en Copyright © 2015 Lawson, Daum, Czauderna, Meuser and Härtling. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Plant Science Lawson, Patrick G. Daum, Diemo Czauderna, Roman Meuser, Helmut Härtling, Joachim W. Soil versus foliar iodine fertilization as a biofortification strategy for field-grown vegetables |
title | Soil versus foliar iodine fertilization as a biofortification strategy for field-grown vegetables |
title_full | Soil versus foliar iodine fertilization as a biofortification strategy for field-grown vegetables |
title_fullStr | Soil versus foliar iodine fertilization as a biofortification strategy for field-grown vegetables |
title_full_unstemmed | Soil versus foliar iodine fertilization as a biofortification strategy for field-grown vegetables |
title_short | Soil versus foliar iodine fertilization as a biofortification strategy for field-grown vegetables |
title_sort | soil versus foliar iodine fertilization as a biofortification strategy for field-grown vegetables |
topic | Plant Science |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4477264/ https://www.ncbi.nlm.nih.gov/pubmed/26157445 http://dx.doi.org/10.3389/fpls.2015.00450 |
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