It looks like the Amazon region was experiencing less rainfall at the time with a corresponding shift towards drought tolerant species with parts of the region as savannahs !!
https://earthscience.stackexchange.com/a/2567
With a different rainfall profile the nutrient loss would have been vastly reduced.
This is something I've taken for granted as per app volume control is integrated into the OS on Motorola phones and I've been using mid range Motorolas since the Moto G 4 in 2016 (they offer a reasonable price, reasonable performance, microSD card and headphone jack).
Then I was setting up a Samsung tablet last weekend and was horrified to see I had to use the Samsung store to download Sound Assistant for something I had just assumed was a standard OS feature for close to a decade.