28
Aug
(Beyond Pesticides, August 28, 2019) Salt marshes, areas of coastal grassland regularly flooded by saltwater, provide a major global service by sequestering and storing carbon in the form of organic matter. However, research finds that nitrate from synthetic fertilizers found in agricultural runoff could change the microbial composition of the salt marshes to encourage organic matter decomposition and, therefore, carbon release versus capture. The study, “Nitrate addition stimulates microbial decomposition of organic matter in salt marsh sediments,†was published in Global Change Biology. Researchers from Massachusetts conducted their study on salt marsh sediments located in Plum Island Sound, MA. They took three core samples from the site, sectioning each one into shallow, mid, and deep sediments. The researchers set out to determine “the role of nitrate as an electron acceptor, and its effect on organic matter decomposition and the associated microbial community in salt marsh sediments.†In sum, they tested soil samples to see how a large amount of available nitrate would impact microbes, and therefore the carbon-sequestering constitution of the soil, versus a plain saltwater control. The results indicate that nitrates stimulate the production of dissolved inorganic carbon, leading to decomposition of organic matter that would otherwise remain stable […]
Posted in Climate Change, Fertilizer, Uncategorized | No Comments »
06
Mar
(Beyond Pesticides, March 6, 2019) After a brief hiatus, Florida Fish and Wildlife Conservation Commission (FWC) is continuing use of aquatic herbicides, including glyphosate, for invasive species management. Public pressure and feedback caused FWC to take a temporary pause from spraying while the commission collected public comment through public hearings and emails from late January through February. FWC ultimately decided to resume spraying invasive species, and points to its improved integrated management system as reducing overall herbicide use. Glyphosate, one of the 17 aquatic herbicides that FWC uses regularly has sparked opposition from environmentalists and the general public due to its wide usage and known adverse effects. According to FWC data, 12,263 pounds of glyphosate-based herbicides were used on Florida’s Lake Okeechobee in 2017. About 175,000 people have signed North Palm Beach photographer and wildlife advocate Jim Abernathy’s petition titled “Stop The State-Sanctioned Poisoning of Our Lakes and Rivers!â€. The petition decries the use of glyphosate to kill invasive aquatic plants and warns of subsequent nutrient pollution caused by decay. An excess of nutrients (e.g. nitrogen and phosphorus) in water bodies contribute to algal blooms. Eutrophication can eventually result in oxygen depletion and thereby decrease biodiversity. FWC denies that the […]
Posted in Fertilizer, Florida, Glyphosate, Uncategorized | 1 Comment »
11
Jul
(Beyond Pesticides, July 11, 2018) Ecologically-based farming systems contain far fewer pests and generate much higher profits than their conventional, chemical-based counterparts according to research published in the journal PeerJ earlier this year by scientists at South Dakota State University and the Ecdysis Foundation. The study supports calls to reshape the future of agriculture, as ‘regenerative’ farms, which avoid tillage and bare soil, integrate livestock, and foster on-farm diversity. These farms are found to represent an economically viable alternative to overly simplified, pesticide and fertilizer-dependent cropping systems. Given the study’s focus on corn cropping systems, such a shift is possible for thousands of farmers throughout the United States. Researchers looked at roughly 75 fields on 18 farms, measuring the organic matter in the soil, insect pest populations, corn yield as well as profit. Farms using pesticide treatments, which in corn fields is represented primarily by the use of neonicotinoid-coated seeds, had 10x higher pest levels than regenerative farms. As noted in the study, pest populations are a function of the biodiversity within the crop field. Biodiveristy increased on regenerative farms not only because farmers sprayed fewer pesticides, but because they also allowed more plants to grow in between rows. More […]
Posted in Alternatives/Organics, Biodiversity, Fertilizer, Integrated and Organic Pest Management | No Comments »
30
Mar
(Beyond Pesticides, March 30, 2018) While conventional farming practices rely primarily on new sources of synthetic nitrogen fertilizer to grow crops, organic agriculture conserves nitrogen by using recycled sources, as detailed by new research published by the University of Virginia (UVA) and The Organic Center. Of concern is ‘reactive nitrogen,’ which is nitrogen in a form that will eventually be used by plants (ex. nitrous oxide (N2O), nitrate (NO3–), nitrite (NO2–), ammonia (NH3), and ammonium (NH4+)), rather than benign, non-reactive nitrogen in the form of N2. “This research is significant and timely because its findings show that many common organic farming practices—like composting and the use of manure fertilization in place of synthetic fertilizers—can recycle reactive nitrogen that is already in the global system rather than introducing new reactive nitrogen into the environment, and thus have a much smaller environmental impact,†said Jessica Shade, PhD of The Organic Center. Earlier this year, researchers at the University of California Davis published a study in Science Advances with the finding that regulators in the state drastically underestimate chemical-intensive agriculture’s contribution to nitrogen oxide (NOx) caused air pollution, acid rain, and respiratory illness in the state. While NOx  pollution is usually associated with energy production and […]
Posted in Agriculture, Alternatives/Organics, Fertilizer, Uncategorized | No Comments »
