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Archive | Soil Fertility

Building Soil Health with Volcanic Basalt

by Rich Affeldt

volcanic-basaltOrganic and sustainable farmers have long relied on rock dust as an all-natural way to improve roots systems, increase yields and promote general plant health in a wide variety of crops and conditions. Yet, it has taken the rapid depletion of our global soils to bring rock dust to the attention of modern agricultural science. The good news is that there is undeniable evidence that rock minerals can help restore soil health, minimize crop deficiencies and boost resistance to pests and disease.

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What is Humus & How is it Formed?

Secrets of Fertile SoilsExcerpt from Secrets of Fertile Soils: Humus as the Guardian of the Fundamentals of Natural Life by Erhard Hennig, published by Acres U.S.A.

by Erhard Hennig

Humus forms as a result of the complicated interplay of inorganic conversions and the life processes of the microbes and tiny creatures living in the soil. Earthworms play a particularly important role in this process. Humus formation is carried out in two steps. First, the organic substance and the soil minerals disintegrate. Next, totally new combinations of these break down products develop, which leads to the initial stages of humus. Humus formation is a biological process. Only 4-12 inches (10-30 centimeters) of humus-containing soil are available in the upper earth crust. This thin earth layer is all that exists to provide nutrition to all human life. The destiny of mankind depends on these 12 inches!

Cultivated soils with 2 percent humus content are today considered high-quality farmland. What makes up the remaining 98 percent? Depending on the soil type, soil organisms constitute about 8 percent, the remains of plants and animals about 5 percent, and air and water around 15 percent.

The remaining 70 percent of soil mass is thus of purely mineral origin. The mineral part of the soil results from decomposition and the erosion of rock. The dissolution of these components is carried out by the lithobionts, which can be seen as the mediators between stone and life. It was Raoul H. Francé who coined the term “lithobiont,” which means “those who live on stone.” The lithobionts are the group of microbes that begin the formation of humus. They produce a life-giving substance from the nonliving mineral. On the basis of this process, living matter, earth, plants, animals and human beings can begin, step by step, to build.

Only soils with an optimal structural state of tilth have a humus content of 8-10 percent. Untouched soils in primeval forests can, at best, reach 20 percent. A tropical jungle can’t use up all its organic waste, so humus can be stored. All forests accumulate humus, but real humus stores only emerge over the course of millennia. Once upon a time accumulations of humus known as chernozem (Russian for black earth) could be found in the Ukraine.

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Inputs Alter Microbial Life

Microbial life in the soil. "E coli at 10000x, original" by Photo by Eric Erbe, digital colorization by Christopher Pooley, both of USDA, ARS, EMU. - This image was released by the Agricultural Research Service, the research agency of the United States Department of Agriculture, with the ID K11077-1.New research from Iowa State University shows that agricultural inputs such as nitrogen and phosphorus alter soil microbial communities. Adding nitrogen and phosphorus fertilizers, commonly used as fertilizers, to the soil shifts the natural communities of fungi, bacteria and microscopic organisms called archaea that live in the soil, said Kirsten Hofmockel, associate professor.

Hofmockel and other scientists associated with the Nutrient Network, a global group of scientists, revealed that microbial community responses to fertilizer inputs were globally consistent and reflected plan responses to the inputs. Many soil microbes perform helpful functions in the native ecosystems and altering those microbial communities may have negative environmental consequences, Hofmockel said. The researchers found nutrient additions favored fast-growing bacteria and decreased the abundance of fungi that share a symbiotic relationships with grassland plants. This encapsulation of the research is from the December 2015 issue of Acres U.S.A.

Large-Scale Community Farming — PrairiErth Shares Strategy, Lessons on Organic Transition

Large-Scale Community Farming

The team at PrairiErth Farm includes (from left): Annette McKeown (apprentice), Jon Clayschute (crew leader), Cassidy A. Dellorto-Blackwell (apprentice), Carly Ambrose (apprentice), Leslie Gravitt (harvesthand), Craig Tepen (farmhand and wholesale coordinator), Katie Bishop (farmer/owner) Hans Bishop (farmer/owner), Graham Bishop (“pig guy;” helps Dave with chores and manages the pigs) and farmer/owner Dave Bishop.

by Tamara Scully

PrairiErth Farm’s 400 acres of Illinois fields are home to corn, soybeans, oats, wheat and alfalfa. They are also home to a diversity of livestock, 10 acres of vegetable crops, 10,000 square feet of hoop house growing areas and beehives. And they are certified organic. The farm, nestled within the Big Ag world of the Midwest, promotes a globally local food system. Their stated mission of “working to develop sustainable life systems on the farm,” extends well beyond the farm. Not only do owner Dave Bishop and his family promote sustainable agriculture to local politicians, the family regularly advocates in Washington, D.C. They continually work to develop a food system in which organic agriculture, independent farmers, regional processors and local agricultural systems work together to grow food transparently, fostering lasting connections between farmer and eater.

“I believe a diverse mix of plants and animals is the foundation of a sustainable farm, and the emerging globally local food systems offer the best — and perhaps ultimately the only — real path into a food secure future,” said Dave Bishop. Continue Reading →

The Soil Solution

The Soil Solutionby Graeme Sait

The UN has named 2015 International Year of Soils, and we should embrace this initiative with open hearts and willing hands. It is an incredibly timely focus in light of a series of serious challenges impacting our future and perhaps our very existence. Soil health directly affects plant, animal and human health. It also impacts topsoil erosion, water management and ocean pollution. Most importantly, it is now recognized that climate change is directly related to soil mismanagement. I believe a global soil health initiative can help save our planet.

The Top Five Threats

While in the UK, I met with a professor who shared some deeply concerning findings. He informed me that a recent survey of leading British scientists revealed that as many as one in five of the best thinkers in the country believe that we will be extinct as a species by the end of this century, or perhaps much earlier. This information should serve to spur meaningful action from every one of us. There are five core threats that need to be urgently addressed, and they all relate back to the soil. Continue Reading →

Fish Fertilizer Meets Nitrogen Needs

Organic LettuceThe authors of a new study have found that hydrolyzed fish fertilizer holds promise as an economically feasible nitrogen source for growing organic vegetables.

“Soluble organic nitrogen sources suitable for fertigation in organic vegetable production are much needed,” said lead author of the study, Charles Ogles. Ogles and colleagues at Auburn University studied the effects of three different nitrogen sources during a two-year crop sequence of yellow squash and collards. The scientists used hydrolyzed fish fertilizer, inorganic nitrogen (N) source with secondary and micronutrients, inorganic nitrogen without secondary or micronutrients and a zero nitrogen control for the study. Nitrogen was applied at recommended rates for both squash and collards, 80 percent of the recommended rates and 60 percent of the recommended rates. The study design included a zero nitrogen treatment used as the control.

“To eliminate the rotation order effect, the crops were switched each year: yellow squash-collard in year one and collard-yellow squash in year two” said Ogles. Continue Reading →