Effects of sodium molybdate foliar sprays on molybdenum concentration in the vegetative and reproductive structures and on yield components of Vitis vinifera cv. Merlot

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dc.contributor.authorLongbottom, M.
dc.contributor.authorDry, P.
dc.contributor.authorSedgley, M.
dc.date.issued2010
dc.description.abstractBACKGROUND AND AIMS: Molybdenum deficiency(Mo-deficiency) has been suggested to be the cause of poor yield of own-rooted Merlot vines in Australia. The aims of these experiments were to quantify the effect of foliar molybdenum treatment (Mo-treatment) on vine molybdenum status and to identify which components of yield are affected by Mo-treatment. METHODS AND RESULTS: Experiments were conducted on own-rooted Vitis vinifera cv. Merlot in South Australia in 2003–07. Vines were sprayed with two rates of sodium molybdate (0, 0.101 and 0.202 g/vine) in the spring. Vine molybdenum status was assessed at flowering and juice molybdenum concentration was measured at harvest. The effects of Mo-treatment on vine growth and yield were also measured. Mo-treatment significantly increased yield of molybdenum deficient vines, a function of improved fruitset. Mo-treatment significantly increased the concentration of molybdenum in the petioles, shoot tips and inflorescences compared with the controls. Budburst was delayed on molybdenum-treated vines in the spring following Mo-treatment. The concentration of molybdenum in grape juice only increased in vines that had sufficient molybdenum. CONCLUSIONS: Mo-treatment increased vine molybdenum status; however, yield only increased on Mo-deficient vines. The increase in yield was a function of improved fruitset. SIGNIFICANCE OF THE STUDY: This research demonstrates a significant positive relationship between vine molybdenum status and fruitset of own-rooted Merlot vines.
dc.description.statementofresponsibilityM. L. Longbottom, P. R. Dry and M. Sedgley
dc.identifier.citationAustralian Journal of Grape and Wine Research, 2010; 16(3):477-490
dc.identifier.doi10.1111/j.1755-0238.2010.00109.x
dc.identifier.issn1322-7130
dc.identifier.issn1755-0238
dc.identifier.urihttp://hdl.handle.net/2440/62071
dc.language.isoen
dc.publisherAustralian Society of Viticulture and Oenology
dc.rights© 2010 Australian Society of Viticulture and Oenology
dc.source.urihttps://doi.org/10.1111/j.1755-0238.2010.00109.x
dc.titleEffects of sodium molybdate foliar sprays on molybdenum concentration in the vegetative and reproductive structures and on yield components of Vitis vinifera cv. Merlot
dc.typeJournal article
pubs.publication-statusPublished

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