Assuming 900,000 people and a very conservative 60 kg average body weight, the ash remains after combustion would produce: Element............Symbol...Bodily%.....Total Volume Calcium ...........Ca...........1.50%........810,000 kg Phosphorus......P..............1.00%.......540,000 kg Potassium.........K.............0.40%.......216,000 kg Sulfur.................S.............0.30%......162,000 kg Sodium..............Na...........0.20%......108,000 kg Chlorine.............Cl............0.20%......108,000 kg Magnesium........Mg..........0.10%........54,000 kg Just the Na and K concentrations would pollute that area and very few varieties of plants would survive that region. Only plants that tolerate extremely basic soils would surive. There is no evidence that the foliage inside the camp is different than the plants ouside the fences.