Dashmellow
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I don't know anything about Vermont, but here, for farm grassland, which is the biggest use of ammonia, and one of the biggest contributors to CO2 emissions, the Nitrogen is typically treated separately from the other nutrients rather than being blended in. Also, for farm grass crops, the Nitrogen is the main component of the fertiliser and by far the biggest contributor to CO2 emissions, partly because the other nutrients often come from organic fertilisers such as slurry.
That is why I used the phrase "depending on the crop". Obviously, you see what you want to see when you read and reply to my posts.
The slurry I mentioned above, is often farm slurry, generally from cows, but on farms that don't have cows, it typically comes from human waste treatment. Yes, it is rich in potassium and phosphorous, and many other useful plant nutrients. Has been used since last century, so not exactly a unique new idea!
Vermont agriculture sounds far more diversified than what you describe in the UK.
Farm slurry is rather a different animal than human urine. The same applies to "human waste sewage" which contains solids and all kinds of other unknown stuff.
Human sewage waste being spread on crops in the UK sounds like a very risky practice, especially because it includes these solids (poop and many harmful contaminants). Human urine used alone is different because it can be pasteurized and research at Rich Earth Institute is exploring how to remove contaminants such as pharmaceuticals. One of the worst things being found in sewage waste sludge are PFAS "forever chemicals". The farmland being treated with sewage is being ruined literally forever!
If successful the research being conducted by Rich Earth Institute may have enormous benefits to places such as small rural agricultural communities in third world nations that have poor soils and otherwise inadequate waste treatment available to them, as well as few resources to afford to purchase fertilizers. Here in Vermont it is only being used experimentally at this point on hay fields, not crops directly consumed by humans.
Apparently, the UK is woefully behind the times of the practice of spreading human waste on food crops.
The UK is importing sewage sludge for use on farmland despite health concerns
Thousands of tonnes of sewage sludge will be used on farmland despite serious health and environmental concerns over the controversial practice.
unearthed.greenpeace.org
The UK is importing sewage sludge for use on farmland despite health concerns
Thousands of tonnes of sewage sludge will be used on farmland despite serious health and environmental concerns over the controversial practice.
unearthed.greenpeace.org
Rules around human waste in farming are 'out of date'
Sewage used as fertiliser could harm agricultural land, says a report for the Environment Agency.
www.bbc.com
Rules around human waste in farming are 'out of date'
Sewage used as fertiliser could harm agricultural land, says a report for the Environment Agency.
www.bbc.com