“Precision viticulture” refers to a technology-laden mission to optimize and equalize grape quality at a local level, decreasing variability plot-by-plot, potentially even plant-by-plant. By collecting data on water use, vine vigor, temperature, soil conditions, and other parameters at multiple points across a vineyard, vignerons can understand how different areas of the vineyard are differing in their performance and, consequently, irrigate or fertilize or prune or harvest or what-have-you differently to suit. Affordable GPS systems, high-tech mapping with geographic information systems (GIS), and lots of spiffy little wireless sensors have made all of this possible and even reasonably practical for vineyards within the past several years (Australia’s national Commonwealth Scientific and Industrial Research Organisation has been notably pushing PV adoption in that country). Oddly enough, though, I hadn’t really thought about what an equivalent “precision winemaking” strategy might look like before a week or two ago.
A week or two ago I paid my first visit (of many, I expect) to Central Otago, New Zealand’s most southerly wine region, famous for pinot noir, Wild West-style scenery, and hordes of international backpackers. When I made arrangements to stop by Felton Road, I was warned that I wouldn’t be able to meet Blair Walter, the winemaker, because he planned to rack that day. (Rack = remove wine from one container to another, most often for the purpose of separating it from the lees, the dead yeast cells and other particles that collect at the bottom of the barrel or tank.) When I learned how he was racking — he found a few minutes to come out and talk in between barrels — the first thing that came to mind was, “gosh, this sounds like precision winemaking.” If precision viticulture is approaching the vineyard on a vine-by-vine basis, then precision winemaking seems as though it should be approaching wine on a barrel-by-barrel basis. Far from technology-laden, though, Walter’s method is simple, elegant, and light on gadgetry.
Their pinot noir is made like this:
1. Crush grapes into stainless steel fermenter tanks. Ferment.
2. Press and transfer wine to barrel. Let wine sit in barrel until February (in Otago, that’s about ten months after harvest).
3. Rack wine off lees, out of barrel and into tanks.
Racking happens only once. Walter says that everything that comes out of the barrel during that single racking goes into the bottle. With that single control point before bottling, he sounds fairly obsessive about ensuring sure that he sees everything that comes out of those barrels. Unsurprisingly, he uses a Bulldog Pup, a clever little racking wand that moves wine by positive displacement instead of active pumping. Positive displacement functionally pushes — “displaces” — the wine out of the barrel by filling the barrel with gas. The barrel is sealed save for a tube pushing the gas in and the tube letting the wine out so that pumping in gas increases the pressure inside the barrel; the wine has nowhere to go but out the exit tube. Bulldog Pups are far more gentle than any pump. They can also virtually eliminate oxygen exposure during racking when nitrogen or argon is used to do the pushing.
Neither of those is Walters’ main reason for using the Pup. He even uses plain-old forced atmospheric air, replete with oxygen, to push. After ten months undisturbed in barrel, the wine can use the oxygen exposure. His reason for racking this way is so that he can watch the wine as it comes up the tube (through a conveniently placed sight glass) and decide on a barrel-by-barrel basis what to leave behind. Bulldog Pups have a foot that will automatically shut off flow at a pre-set level: a winemaker can decide to leave four inches of lees in each barrel, set the foot appropriately, and then leave the cane to mind itself while his attention is elsewhere. Walters doesn’t automate, and the only person who racks is him.
Walters’ approach reminded me of what his colleague Gareth King, Felton Road’s viticulturist, said about how he practices precision viticulture. The man doesn’t seem to want for much, but when we encountered the harvest crew coming in from a morning vineyard walk, he said, “You know my best technology? They just walked past us.”
I can’t say what difference GPS sensors versus summer interns might make, but I can say that Felton Road’s pinots were among the best I tasted. Central Otago pinots can be a bit clunky, but Felton Road’s are texturally lighter and more elegant, with plenty of clean raspberry and strawberry aromas up front backed up with enough earthiness and tannins to keep things interesting. The 2012 Bannockburn and 2012 Cornish Point bottlings seemed to walk that balance of lightness and structure particularly well.
Precision viticulture is veritably new. It’s downright revolutionary, really, in terms of how it changes the way vignerons can think about vineyard management. But technology isn’t the only way to pay attention to details. The old-fashioned strategy of carefully and consistently observing what’s happening with individual vines isn’t an exact substitute for GPS-enabled water uptake meters: the technology is more precise and lets the vineyard manager put his eyes in a lot of different places at the same time — and collect data in his sleep or during family meals, which has to be a real boon. And I can imagine monitoring individual barrels with some kind of wireless oxygen sensor that can track and measure differences between how each barrel transmits oxygen — since every barrel is unique in this respect — and lets winemakers make corresponding individualized adjustments. No amount of careful personal attention could do that.
But Walters’ version of precision winemaking and King’s version of precision viticulture will serve as a good reminder for me every time I read a journal article or press release about some nifty new precision gadget. Some of the best technology comes on two legs.