Improvement of Mg uptake of grapevine by use of rapeseed oil ethoxylates for foliar application of Mg

Authors

  • R. Haefs
  • M. Schmitz-Eiberger
  • H. D. Mohr
  • G. Noga

DOI:

https://doi.org/10.5073/vitis.2002.41.7-10

Keywords:

adjuvants, cuticular penetration, leaf fertilizers magnesium, foliar nutrition, surfactants

Abstract

To improve the uptake of foliar-applied Mg a new group of toxicological and ecotoxicological harmless surfactants (rapeseed oil ethoxylates) with an average of 5 (Agnique RSO 5®), 10 (Agnique RSO 10®), 30 (Agnique RSO 30®) and 60 (Agnique RSO 60®) units of ethylene oxide (EO) was evaluated as adjuvants for a MgSO4 and Mg(NO3) formulation. The impact of the surfactants on Mg penetration was studied using astomatous cuticular membranes isolated from mature tomato fruit. The biological efficacy of a formulation, containing castor oil, ionic and non-ionic surfactants with and without addition of RSO 5 was investigated in two vineyards at the Moselle valley, cvs Riesling and Regent. Especially RSO 5-surfactant increased Mg penetration through isolated cuticles. Under field conditions, Mg application enhanced significantly the Mg content in leaves. The Mg level in bunch stems merely increased when formulated 'Bittersalz' was applied. 'Magnisal' and formulated 'Magnisal' reduced markedly Mg deficiency symptoms in leaves and increased Mg content in leaves of cv. Regent.

 

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Published

2015-04-22

Issue

Vol. 41 No. 1 (2002): Vitis

Section

Article

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