Interactions between nitrate and chloride in nutrient solutions for substrate grown tomato

W. Voogt, C. Sonneveld

Research output: Chapter in Book/Report/Conference proceedingConference paperAcademicpeer-review

9 Citations (Scopus)

Abstract

In two successive experiments tomato was grown at different Cl and NO3 concentrations in the root environment with rockwool as a sub-strate. The EC value in the nutrient solution was fairly constant, varying between 3.5 and 4.0 dS m-1 in all treatments. The NO3 concentrations in the treatments varied between 0 and 25 mmol L-1, with a step-wise replacement of NO3 by an equivalent Cl concentration. With the crop grown in winter-spring the yield was reduced at a low N-supply, but with the crop grown in summer-autumn no significant difference was found in the range of the NO3 concentrations between 1 and 25 mmol L-1. Blossom-end rot decreased and gold speck increased with increasing Cl/NO3, indicating an improved Ca uptake. This was confirmed by the results of the tissue tests, which showed higher Ca contents with increasing Cl/NO3. The reasons for this increased Ca uptake are discussed, but could not really be explained by the data collected. It seems clear that tomato can be grown at rather low NO3 and high Cl concentrations in the root environment and this pro-vides opportunities to lower NO3 concentrations in the drain-off and a consequent reduction of environmental pollution. This is of great interest, especially with crops grown at a high EC value like tomato
Original languageEnglish
Title of host publicationProceedings of the IS on Growing Media and Hydroponics
EditorsB. Alsanius, P. Jensén, H. Asp
Place of PublicationLeuven
PublisherISHS
Pages359-368
Volume644
ISBN (Print)9789066055377
Publication statusPublished - 2004
EventInternational Symposium on Growing Media and Hydroponics 2004 - Alnarp, Sweden
Duration: 15 Jun 200416 Jun 2004

Conference

ConferenceInternational Symposium on Growing Media and Hydroponics 2004
CountrySweden
CityAlnarp
Period15/06/0416/06/04

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