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VENSource Research
Effect of nitrogen fertilization on tissue nitrogen levels, yield and grape composition of Syrah on three different rootstocks
These Australian authors study how much N to apply to Syrah, and when, to optimize yield and juice composition. They discover that the answer depends a lot on which Syrah/rootstock combination we are talking about.
Find the full text (second article on the list) at: http://www.blackwell-synergy.com/toc/ajgw/13/1
101. nitrogen and vine performance on several rootstocks.pdf