Showing posts with label grapevine. Show all posts
Showing posts with label grapevine. Show all posts

Tuesday, October 27, 2009

China -the first days

Just to join those that say you can't go to China on a business trip and not take in some of the other great things to do there, here I go!

I got to China on a Tuesday afternoon, arriving at the gate on time at about 3:15pm. However, it was a long wait to get through immigration. The airport is astounding in its scope! The terminal I arrived in was built for the 2008 Olympics and accommodate the flocks of people attending the event, but I could not have prepared myself for the magnitude of its size. It is an impressive complex!

The next two days were a whirlwind of touristy visits, including the Great Wall, which is a marvel, but it's disappointing to know that the sections that most tourists see are reconstructed out of stone, when the originals were much different. As only relatively small sections have been done up for the tourists, there are still original remants that you can see. Although we didn't get to see any of these near Beijing, they are nearby. Still, the reconstructed wall is not to be missed. What I was impressed with was the steepness of sections of it. There was no giant earth moving machinery in those times, so wherever the ground was, the wall was built. Amazing to think of the amount of effort that went into it!

We also visited Tiananmen Square, the last day before it was closed to the public in preparation for the 60th anniversary celebrations, the Forbidden City, which is an immense site filled with more things to see than you could possibly fit into a single day, and the Summer Palace, which seemed appropriately palatial!

These sights, along with an impressive array of diverse foods, got us off to a rocking start!

Oh, and yes, we did actually view something grapevine-y! We were lucky enough to be able to visit Chateau Nubes, which is a winery yet to be opened, but is among quite a few start-ups (around 60) that are appearing in the area near Beijing/the Great Wall in order to capture some of the tourism market.

The courtyard of the unfinished winery. Underneath this area are the underground cellars.


No small outfit is this - the building is being made out of local stone, as per the native traditions of the area, and vast underground tunnels will hold the wine for ageing and various functions. The vineyards were young, and as the winters are harsh, with cold and wind-blown sand, all vines (own-rooted) are buried over the dormant season (more on this later!).

This is one of the three year old Cabernet Sauvignon vines in the vineyard. The irrigation water runs right under the vines. The main trunk is buried in the winter months. The cane to the left of the photo could be used as a replacement trunk.

The vineyards will eventually cover 50 hectares, but only 20 had been planted so far. Rainfall is only 200-400mm per year, so the vines are irrigated by furrow. The soil is basically sand (this was all desert, after all!) with a relatively thin layer of topsoil. Harvest of the approximately 6t/ha happens in mid-October, about the same time as the frosts arrive, funnily enough. All they had bearing at the time was Cabernet Sauvignon, which was in its third leaf this season.

Looking down the rows - note that the soil is hilled up in the centre - the soil that is used to cover the vines in the winter needs to go somewhere! This also limits the row spacing, as if it is too narrow, there isn't enough soil available to cover the vines!

One nice thing about the area is that at present, there is little problem with fungal disease, with copper sulfate for Downy Mildew control being used occasionally.

So on these first days we were exposed to the magnitude of China's largest city and its key tourist attractions, but also to the potential boom in wineries in the area around Beijing. The real estate agent's mantra, "location, location, location!" applies here as elsewhere - you need to be near the market! With lots of wineries popping up near Beijing, there are quite a few new businesses that are hoping tourist dollars (and curiously, the government, which buys a lot of wine to give as gifts) will help their wineries grow.

Friday, August 14, 2009

Wind Machines

Since I'm here in Ontario for a while, one does get to touring around vineyards (and wineries!) a bit.

In NZ, wind machines are popping up all over the viticultural landscape, as the most common type of frost occurring in the spring are radiation frosts. Something that moves the air can be very effective in avoiding freeze damage to the vines, because in such a frost cold air develops near the ground, but warmer air accumulates on top of that cold air. This is called an inversion layer, with the warm air stacked on top of the cold.

A wind machine sticks up far enough above the ground (say, 10m) to draw this warmer air down and mix it with the colder air. In most cases, there is a significant reservoir of heat in the inversion layer, meaning that the mixed air is warm enough to prevent freezing of the vine tissues for many hours.

Helicopters are also used to mix the cold and warm layers, but if a vineyard is in a location that is hit consistently with frosts, it can be worth the capital cost to buy, install, and maintain the fans.

So in NZ there are a lot of wind machines being put in to help manage spring freeze events, but here in the Niagara region, they are also putting them in. However, spring frosts are not so much of a concern here (due to the general climate and also the location of the vineyards). So why are people investing in these expensive machines?

Here the main problem is freezing temperatures during the dormant season. Grapes can be very hardy plants, surviving very low temperatures (for certain species, this can be down to less than -40 degrees C!), but vinifera vines tend to be more tender, with a critical temperature of around -18C. So if the temperature in a region tends to get lower than this on a regular basis, you had better have some methods to manage the vines to prevent damage!

One method relies on the presence of the inversion layer, which can appear in the middle of winter as well as in the early spring (or autumn). By mixing the air, freezing temperatures low enough to damage dormant vine tissues can be avoided, leading to productive vines the next season. Without some form of protection, crop losses can be 100 percent, with the added burden of having to re-train the vines (if you're lucky) or re-plant them (if you're not lucky!).

I will write on other strategies to avoid winter freeze damage in another post...