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Compost Tea

December 4, 2015 Adriana Neal
Our compost tea brewer hard at work aerating a batch of tea.

Our compost tea brewer hard at work aerating a batch of tea.

Here at Seven Oxen we’re always striving to practice farming techniques that will enhance the health and longevity of our vineyard. We cherish our vines and the quality fruit they generate for our wines, and aim to do everything we can to guarantee they continue to produce wonderful, flavorful grapes. And you can’t have healthy vines without healthy soil. 

One of the many fantastic things about having an estate winery is you’re in control of your product all the way down to the microorganisms that feed the vines. And this is one of a number of areas where our Winemaker (who also happens to be our Grape Grower) likes to devote special care and attention. Enter compost tea.

 So what is compost tea and why is it important? 

Compost tea is a concentrated solution made up of billions of beneficial microorganisms (bacteria, fungi, protozoa, and nematodes). Compost tea is made through a process of “brewing” very good compost packed with microorganisms in an aerated water tank. Food for those microorganisms is added to the water during the brewing process, which causes the microorganisms to multiply at a very rapid rate. The result is a nutrient rich liquid resembling weak coffee that can be sprayed directly onto the leaves of the vines or spread on the soil.

Spraying compost tea directly onto our vines.

Spraying compost tea directly onto our vines.

Compost tea can have a huge impact on the quality of soil, and therefore, on the health of vines. The tea improves plant nutrition by increasing nutrient retention in the soil and nutrient availability for the vine’s root syste. For the conventional farmer, this could mean no need for harmful chemical fertilizers that actually destroy the beneficial microorganisms in the soil ecosystem. The improved soil structure resulting from the use of compost tea also reduces water loss, cutting back on the demand for irrigation.  

When sprayed directly on the surface of a vine’s leaves, the “good” biology contained in the aerated compost tea occupies vulnerable sites on the leaf surface, helping the plant fight off potential diseases like mildew and mold. This reduces (and often replaces) the need to spray organic esticides such as sulphur or disease prevention.  

So have we noticed a difference since we started using compost tea? Indeed we have.

Our happy, healthy, compost-tea-fed vines at sunrise, just before our first harvest of 2015.

Our happy, healthy, compost-tea-fed vines at sunrise, just before our first harvest of 2015.

We began spraying compost tea in the vineyard in winter of 2014, as soon as our vines dropped their leaves. Over the course of the following year we sprayed the microorganism rich brew once a month, and were able to avoid the use of any additional organic fertilizers or pesticides, including sulfur. Our vines have never looked healthier, and despite low yields in our 2015 harvest (due to extreme heat and drought conditions) our fruit was beautiful. By keeping synthetics and chemicals out of our vineyard, our vines produce fruit that fully expresses the rich, healthy soil of our unique property, which translates directly into the flavor of our minimally processed wines. 

In Farming Tags Compost, Microorganisms, Sustainable, Organic
2 Comments

Seeds of Change

October 21, 2015 Adriana Neal

By Rebecca Mercer Leduc

Many of you have asked about what’s happening in the vineyard at different stages in the season, and maybe this blog post can help demystify the grape growing process for the wine connoisseurs and the curious among you.

So, what is a cover crop? Well, this year it’s a mix of oat, wheat, barley, and common vetch, which will be seeded in every row of our 26 acres of vines. Over the course of the winter and next spring, the growth of the crop will help to produce organic matter, increasing the biomass and fertility of the soil and helping to prevent erosion.

The vetch, a legume (beans, lentils, and soy are all examples of common legumes) which produces a delicate, purple flower in the springtime, fixes nitrogen from the air into the soil, allowing the root systems of the three grains to grow deep. I just learned from Bastien that one single oat grain can produce 600 kilometers (372.8 miles) of roots. How amazing is that?! As they grow, the oat, wheat, and barley roots break up compacted earth and allow water to penetrate further into the ground. And when it doesn’t rain here from early June until late October, this water retention is really, really important!

Viticulture, or grape growing, is a cyclical process, and if we consider the grape harvest to be the end of that process, seeding a cover crop is more or less the beginning. This year’s harvest began on September 10 and ended on September 24. These dates will vary year to year, depending on a number of factors, the most significant of which is the weather. Once the grapes are picked, we breathe a big sigh of relief and then begin looking ahead to the winter months of caring for the vines and the soil.

With any luck, we’ll get some much needed rain in a few days, and those seeds will start to germinate. 

P.S. I am not an agrologist, or a biologist, or a horticulturist, or any other -ist for that matter, so if you have questions on the soil science by all means leave a comment and I’ll defer to the master (Bastien) for more information. 

In Farming Tags cover crop, organic farming
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