Posts by Ellen Gordon
Going Underground

“We know more about the movement of celestial bodies than about the soil underfoot.” Leonardo Da Vinci

This article is excerpted from the Spring 2024 issue of Plenty Magazine. We present the initial portion of the article. You may then link to Plenty’s website to read the remainder of the piece, and see the charts and photos that accompany it.

Stand outside during the tail end of winter and the local landscape is quiet, a palette of soft grays and browns—dormant-seeming, except for the scurrying of squirrels or a line of honking geese overhead. Deciduous trees are largely bare, apart from oaks and beeches, whose dead leaves cling to them for most of winter—a strategy dubbed marcescence—but that’s another story. No new sprigs of green, no burst of floral colors. By early March, many of us are desperate for spring, overflowing with signs of its rebirth.

But just below our feet lies an entire world whose activity barely shows all winter, a vital realm brimming with as much life, if not more, than we can see in plain sight. In reality, there are more living organisms in the soil than all the other life forms above ground! When we aren’t disrupting their work, the nourishment they help liberate is ready the moment the soil warms enough to activate growth in plants and to awaken seeds. In fact, “Soil is alive. Much more than a prop to hold up your plants, healthy soil is a jungle of voracious creatures eating and pooping and reproducing their way toward glorious soil fertility,” says Kathy Merrifield, a retired Oregon State University scientist.

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Testing Agrivoltaics in the Ag Reserve

January 5, 2024

“Agrivoltaics,” is a new buzzword in solar energy circles. The term applies to land used for agriculture (“agri”) and for generating solar energy (“voltaics”) by solar panels. Agrivoltaics can refer to just a few solar panels mounted on ground-based structures (as opposed to rooftops) or a whole field of them, with crops or animals grazing underneath.

A successful agrivoltaic project has some type of farming thriving adjacent to or under the panels, with the panels generating sufficient power to justify the economics of constructing and installing them. That can be a tall order—but not an impossible one. Agrivoltaics projects are very much in the research phase. The approach is not a fully proven yet, though it’s being viewed as workable under the right circumstances. For now, much of what’s known about agrivoltaics has come from research in dry areas in the western U.S. Some of these areas are sunnier and hotter than the Mid-Atlantic region in the summer and colder in the winter. Thus, agrivoltaic projects that are successful out west aren’t necessarily relevant to the Mid-Atlantic.

Other concerns and potential downsides are emerging. Ground solar panels can disturb and compact soil. They also decrease the amount of sun that reaches plants, affecting photosynthesis. And ground panels can adversely affect how much rain reaches plants and in what pattern. For example, run-off from panels can cause water to pool in some areas. Another practical concern is how farmers get equipment in and around ground panels. All these issues, and others, are being studied. 

Agrivoltaic proposals for the Ag Reserve

In 2020, Montgomery County adopted a zoning change that allowed solar arrays on land zoned for agriculture in Montgomery’s County’s Ag Reserve. The measure was a compromise. It recognized the need to generate more renewable energy in the county while at the same time preserving farming, especially on the county’s best soils. The measure also encouraged more production of rooftop solar. It increased the allowable amount of solar production for landowners from 120% of their personal use to 200%. That meant people could sell any excess solar electricity they generated back into the electricity grid. Community solar arrays, which are smaller than “utility scale” arrays, are also allowed under the measure. They can produce up to 2 megawatts of electricity, and generally require 10 to 12 acres of land. Importantly, placing solar arrays on farming soils designated class 1 or class 2 (high quality soils) is prohibited.

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