The Czech soil triangle is shit. We do recognize písčité/hlinité/jílovité půdy (the three major categories on the left) but the only triangle that isn’t just a translation of the US one (where loam = hlína (dirt) and silt = prach (dust)) is this (from ČSN industry standards), which does not differentiate between silt and clay, the three corners are gravel, sand and fine particles:
I guess they had no technology to differentiate particles below 50 µm so they just separated sand and gravel from the rest and made them differentiated them with a 2mm sieve to still have a 2D chart, which could have just been two 1D axes
The Czech soil triangle is shit. We do recognize písčité/hlinité/jílovité půdy (the three major categories on the left) but the only triangle that isn’t just a translation of the US one (where loam = hlína (dirt) and silt = prach (dust)) is this (from ČSN industry standards), which does not differentiate between silt and clay, the three corners are gravel, sand and fine particles:
I guess they had no technology to differentiate particles below 50 µm so they just separated sand and gravel from the rest and made them differentiated them with a 2mm sieve to still have a 2D chart, which could have just been two 1D axes