Cart 0 items: $0.00


Qty Item Description Price Total
  Subtotal $0.00

View Cart

Your Account
aristocratic wines at democratic prices

A to Z Wineworks

Ryan Collins
April 22, 2016 | Education, Viticulture & Sustainability | Ryan Collins

The effects of water on tannin levels in grape development - Part three: Irrigation

In February I had the pleasure of speaking at the Oregon Wine Industry Symposium on a panel talking about grape and wine tannins. Anna Matzinger, Steve Price and I wanted to clarify what tannins are, how their levels in wine affect texture and structure of the wine, where tannins come from, the role of soil moisture on grape tannin levels and how harvest date affects quality of tannins.

I was tasked with talking about the relationship between soil water status and grape tannin levels. It was a great opportunity to improve my understanding of the relationship, and helped me come to terms with the difference between dry farming here in the Willamette Valley and the irrigated vineyards in Southern Oregon. On dry farmed sites factors like soil type, depth and texture, along with the seasonal rainfall have a profound effect on tannin level. In vineyards where there isn’t enough soil moisture to sustain the vines for the entire season, supplementary irrigation is needed. In those vineyards you have more control over the tannin levels of the grapes. To understand this topic and prep for my panel discussion, I studied three key disciplines: 1) soil science; 2) plant physiology; and 3) irrigation management.

Before I get into this I will say that I think the Internet is great for researching topics but I really like books.

part three: irrigation

By controlling the water applied to plants through irrigation you can study its effects on the growth of the vines, yield and also the fruit chemistry. In dry farmed situations it’s very hard to control the water therefore it is harder to study the effects of water on the vines and fruit.

There have been a lot of studies on irrigation management all over the world and the effects of varying irrigation levels at different points throughout the season. What researchers have found is that by applying less water than the vines are losing to ET between fruit set and veraison, you can control the vine growth and vigor, increase the exposure of the fruit and reduce the berry size. All of these factors help to increase the concentration of tannins and other phenolic compounds in the grapes, desirable in red grapes but less desirable in white grapes.

This understanding has led to wide spread adoption of the irrigation practice called Regulated Deficit Irrigation (RDI) and it is used to improve the quality of red wine grapes. To learn more about RDI visit this site:


BrandonCole's Gravatar
@ May 27, 2016 at 3:35 AM
Wow!!! Really wonderful article. Well presented article. I really loved the way you used to present the topic. Really great to read :)

Obat flek paru paru's Gravatar
Obat flek paru paru
@ Jul 13, 2016 at 11:17 PM
Very interesting and very useful article, good luck.

academic writing service's Gravatar
academic writing service
@ Aug 11, 2016 at 10:31 PM
I really appreciate your photography work, I have looked all over your website and but we also provide research paper service and thesis writing help, in advance, thank you so much.

Curtisflum's Gravatar
@ Jan 25, 2017 at 12:36 AM
mmkknsn Scarpe Timberland Uomo Invernali Shox Vendita Vans Shoes Authentic Air Force One Basse Rosse Lunarglide 3

Douglasmi's Gravatar
@ Jan 26, 2017 at 6:42 PM
jlfghmp Nike Air Max Thea Textile Women's Air Max 2016 Jaune Nike Free 5.0 Nere Air Max Thea Cuir Femme Reebok Negozio Torino

Thomaserer's Gravatar
@ Jan 27, 2017 at 12:25 AM
ggpullb Free Run 5 Uomo Timberland Uomo Scarpe Da Barca Air Max Thea Beige Pas Cher Sneakers Reebok Nike Free Black

Richardnog's Gravatar
@ Jan 28, 2017 at 9:26 AM
yagdzkh Nmd 2016 Nike Huarache 2016 Homme Gazelle Adidas Femme Soldes Air Jordan 1 Rouge Blanc Nike Air Max 90 Oro

Curtisflum's Gravatar
@ Feb 9, 2017 at 10:11 AM
wkdjzzsña.htmña-612.html Adidas Nmd Rojo Air Max Azules Y Blancas Mujer Adidas Superstar Colores Toy Story Vans Precio Gorras Memphis Grizzlies

Curtisflum's Gravatar
@ Feb 10, 2017 at 2:34 PM
hzutacxña-rebajas.htmlña-facebook.htm Puma España Online Reebok Naranja New Era Chivas Modelos Timberland Zapatillas Trekking Blusas Abercrombie Mercadolibre

Richardnog's Gravatar
@ Feb 11, 2017 at 6:43 AM
yhisbucña.php Comprar Nmd R1 Air Max Thea Mujer Baratas Puma Tenis 2016 Hombre Canteen Oakley Zapatos Nike Air Force Botines

Richardnog's Gravatar
@ Feb 11, 2017 at 6:53 AM
njcvfoq Ralph Lauren Polo Mujer Oakley Fast Jacket Polo Lacoste Mujer Precio Nike Free Run 3 Mujer Precio Adidas Flux Red

Curtisflum's Gravatar
@ Feb 11, 2017 at 7:29 AM
cearucq Huaraches Nike Air Max Print Nike Free Run Amarillas Zapatillas Nike Air Max Mujer Azules Ray Ban Justin Mujer

Richardnog's Gravatar
@ Feb 22, 2017 at 7:34 AM
ivlduwmß-41.php Nike Flyknit Roshe Run Herren Converse Leer Wit Puma Sportschoenen Online Jordan 11 Blue Adidas Originals Maat 39

Add A Blog Comment
E-Mail me when someone comments on this post

Leave this field blank: