By Jordan Lonborg
Biodynamics has lots of facets, including applications of minerals, planting of flora, integration of fauna, and even reacting to celestial stimuli. But one of its most important components is one of the oldest, and one of the most practical for the home organic gardener. What is this magical tool? Compost, of course.
What, where, and how do you compost? I'm happy you asked. Essentially, when you compost, you are encouraging a natural process, and then using the beneficial byproduct of what in the wild would be a part of the yearly cycle of growth and decay that takes place in every stand of trees, every forest, and most of all, every jungle on the planet. Simply put, compost is the biodegradation, or breakdown, of plant material that falls to the ground in the form of leaves, fruit, branches etc. The second that material hits the ground, the breakdown begins. This food chain is often invisible, and frequently smelly, but without it, there is no life on this planet. Small insects and microorganisms begin to feed on the litter. As the litter is continuously broken down by various organisms -- insects that you can see with the naked eye, all the way to microscopic bacteria -- nutrient rich humus (not the cracker spread) is excreted. As the humus accumulates, beneficial bacteria and fungi begin to grow. These bacteria and fungi work in symbiosis with the root structures of living plants, allowing those plants to take in the nutrients that are contained in the humus.
In a farm setting, where we try to recreate this natural process, there are many ways and forms of composting. At Tablas Creek, we utilize the process commonly known as wind row composting (long rows that are typically 7-8 ft. wide and 5-6 feet tall). When starting the pile, there are a few crucial steps/measures that need to be taken to create a biologically active environment. First and foremost is the carbon (dry, woody material) to nitrogen (“green” material or plant material that still has moisture within it such as pressed grapes or the rachis/stems of the cluster’s that had recently gone through one of the first steps in the winemaking process known as de-stemming). Ideally, this ratio should be 3:1, carbon to nitrogen. Our carbon source comes from all of the prunings collected from across the ranch. We put these through a chipper and add walnut tree wood chips from piles we kept after clearing the old walnut trees from the part of the property known as “Jewel Ridge” (this will eventually be our next dry farmed planting).
The carbon sources are collected and piled up throughout the winter months. During harvest is when the magic happens. As grapes are pressed and de-stemmed, we begin to incorporate the skins and rachis into the piles of woody material. The breakdown of the woody material and formation of humus begins at this point. When the green material starts to decompose, heat and moisture start to release, and microorganisms that feed on the woody material begin to feed and populate. At this point, it is crucial to monitor the temperature of the pile. The ideal internal temperature of a pile that is actively composting is 150-155 degrees Fahrenheit. When green material is incorporated into the pile in the beginning stages, decomposition of the green material can occur so quickly that temperatures within the pile can skyrocket. When a compost pile experiences prolonged temperatures of 170 degrees and above, anaerobic (oxygen deprived) conditions begin to form, which both suppresses the growth of of beneficial microorganism and allows other non-beneficial microorganisms to take their place. To prevent this from happening, we “turn” the pile.
Turning our compost pile has become what Neil Collins, Tablas Creek's most esteemed (OK, he's the only winemaker since inception), termed an “obsession” of mine. He is correct. Taking a 20” thermometer and inserting into a pile that is 8’ wide, 6’ tall, and 50 yards long, at this point in the year and reading temperatures that exceed 170-180 degrees absolutely blows my mind. Therefore, to encourage the beneficial microbiological activity within the pile, and with hopes of trying to get the temperature to stabilize at 150-155 degrees Fahrenheit, as the sun is coming up I hop in the loader, and begin to move the pile, scoop by scoop to an adjacent location. This process incorporates oxygen, decreases the temperature, and disrupts and any anaerobic activity that may be beginning to occur. It’s an amazing sensation when you start getting into the heart of this pile that is creating ridiculous amounts of heat, steam, and smells during cold mornings at sunrise. The aerobic, properly composting sections of the pile smell amazing. Like earthy, mulled cider to an extent. When you hit the anaerobic areas, they also smell amazing but would be considered more of a stench than anything. I’m still working on a descriptor, but think of a hot swamp. No bueno. During this point in the year/composting process, we turn the pile every 2-3 days. In time, the temperatures begin to stabilize and the constant need to turn the pile subsides. The microorganisms that have been digesting the woody material and in turn releasing the beginning stages of humus are in full effect. Beneficial fungi and bacteria begin to bloom at rapid rates. This is our happy place. In nature, it can take many, many years for humus to even begin to form. A properly managed compost pile expedites that natural process. From last week:
Some steamy early morning compost action! As our piles grow our Viticulturist Jordan is turning them to ensure that they don’t build up too much in temperature as the microbial activity builds. The temperature on this pile reached 180 degrees this morning! pic.twitter.com/wjPInPhaAQ— Tablas Creek (@TablasCreek) October 9, 2018
Traditionally, we’ve spread the compost created on the farm throughout the vineyard and followed up with an implement known as a disc which incorporates the compost into the soil profile. But that's not the only way we use the compost. We have expanded our compost tea program: a process in which you take compost, soak it in a tank of water that is heavily oxygenated, and encourage the beneficial microorganisms to move off of the compost into solution. Next we add nutrients to the tea, and the compost's beneficial microorganisms (now in suspension in the water) begin to feed on these nutrients and extrapolate at a rapid pace. This finished tea is like a probiotic shake for a grapevine, packed with beneficial organisms, and can be injected directly into the soil profile through your drip system or applied to the vine leaves throughout the vineyard. If applied through the drip system, whatever organic matter resides in your soil profile will break down faster while foliar applications have shown to combat powdery mildew and provide nutrients to grapevines.
Composting is a necessary process that takes place on most if not all organic and biodynamic farms across the world. Yes, we could purchase organic fertilizers, but why would we want to, when composting means we reuse the waste generated on our farm, we produce a product that can be used in many ways to increase the fertility of our soil and the health of our vines, and we do it all without having to bring anything in from the outside, with all the trucking and greenhouse gas impact that implies.