4 ms·

A fair bit of the rich soil in the mid west, west, and north west are from previous volcanic eruptions. Substantial areas have 1 meter or more of high quality

by sliken 2y ago

A fair bit of the rich soil in the mid west, west, and north west are from previous volcanic eruptions. Substantial areas have 1 meter or more of high quality soil, which we are squandering by over watering, overly intense agriculture, not preventing erosion, and using too much fertilizer. Not only is fertilizer very energy intensive to produce, it also contributes to de-oxygenation of lakes, rivers, and the ocean. It's no exaggeration that this might well end civilization on earth. If we lose the oceans (which are already becoming oxygen depleted) it's going to be that much harder to feed everyone. So I'd consider volcanic ash a pro, not a con. Sure we might lose a single growing season, but could help us for centuries, if properly managed.

kmbfjr 2y ago
Volcanic ash is extremely acidic, you will lose more than just a single growing season. It also pulverized rock and volcanic glass, which causes all manner of hell when the wind blows.
rocqua 2y ago
Fertilizer isn't just energy intensive, the phosphorus part of it is non renewable. We get it from mining, there are limited deposits, the process of building the deposits happens on geological timescales. My hope is that the running out will be a slow process that comes with a slow price increase so people are eventually incentivized to find alternatives. Also, the mining process leaves very toxic tailings, but that is true for most mining.
- pfdietz 2y ago
  Eventually we'll be mining average crustal rock for phosphorus, at 0.1% concentration, as well as recycling phosphate-containing wastes back to soils. It could be the mineral that sets the minimum global annual mined volume after fossil fuels are done (those currently dominate, ignoring such things as gravel and ground water.) On the positive side, I believe most phosphate fertilizer is not immediately absorbed by plants, but instead goes into forming relatively insoluble phosphates in the soil (phosphate fertilizer is formed by solubilizing phosphate minerals by treatment with large amounts of acid). This forms a phosphate bank in the soil. Over time, if I understand correctly the residual solubility of these minerals (especially under the influence of organic acids secreted by plant roots) will reduce the need for additional phosphate additions, assuming the soil doesn't erode away.

by sliken 2y ago

kmbfjr 2y ago

Volcanic ash is extremely acidic, you will lose more than just a single growing season. It also pulverized rock and volcanic glass, which causes all manner of hell when the wind blows.

rocqua 2y ago

Fertilizer isn't just energy intensive, the phosphorus part of it is non renewable. We get it from mining, there are limited deposits, the process of building the deposits happens on geological timescales. My hope is that the running out will be a slow process that comes with a slow price increase so people are eventually incentivized to find alternatives. Also, the mining process leaves very toxic tailings, but that is true for most mining.

pfdietz 2y ago
Eventually we'll be mining average crustal rock for phosphorus, at 0.1% concentration, as well as recycling phosphate-containing wastes back to soils. It could be the mineral that sets the minimum global annual mined volume after fossil fuels are done (those currently dominate, ignoring such things as gravel and ground water.) On the positive side, I believe most phosphate fertilizer is not immediately absorbed by plants, but instead goes into forming relatively insoluble phosphates in the soil (phosphate fertilizer is formed by solubilizing phosphate minerals by treatment with large amounts of acid). This forms a phosphate bank in the soil. Over time, if I understand correctly the residual solubility of these minerals (especially under the influence of organic acids secreted by plant roots) will reduce the need for additional phosphate additions, assuming the soil doesn't erode away.