Correction: Determining soil particle-size distribution from infrared spectra using machine learning predictions: Methodology and modeling.

[This corrects the article DOI: 10.1371/journal.pone.0233242.].

In the “Spectral data modeling” subsection of the “Results” section, there is an error in the fifth sentence of the first paragraph. The correct sentence is: “Combining laser and sedimentation methods in Set2 improved the clay predictions with R2 values of 0.80–0.85.”

In Fig 4, incorrect titles were used on the left-hand side to correspond to the values of the Mean ilr differences. The authors have provided a corrected version here.

Fig 4

There are errors in Table 2. Please see the correct Table 2 here.

Table 2

Comparison of methods (method1 minus method2) using paired t-test and confidence intervals (p ≤ 0.05).

Target variable	Method1	Method2	p.value	N
[Carbon | Clay,Silt,Sand]	Sedimentation 2-point No peroxide	Sedimentation 2-point peroxide	ns	38
[Carbon | Clay,Silt,Sand]	Sedimentation 2-point No peroxide	Laser 0 min	****	46
[Carbon | Clay,Silt,Sand]	Sedimentation 2-point No peroxide	Laser 2 min	****	106
[Carbon | Clay,Silt,Sand]	Sedimentation 2-point No peroxide	Sedimentation multi-point No peroxide	****	763
[Carbon | Clay,Silt,Sand]	Sedimentation 2-point No peroxide	Sedimentation multi-point peroxide	****	206
[Clay | Silt,Sand]	Sedimentation 2-point No peroxide	Sedimentation 2-point peroxide	**	38
[Clay | Silt,Sand]	Sedimentation 2-point No peroxide	Laser 0 min	****	46
[Clay | Silt,Sand]	Sedimentation 2-point No peroxide	****	****	106
[Clay | Silt,Sand]	Sedimentation 2-point No peroxide	Sedimentation multi-point No peroxide	****	763
[Clay | Silt,Sand]	Sedimentation 2-point No peroxide	Sedimentation multi-point peroxide	ns	206
[Silt | Sand]	Sedimentation 2-point No peroxide	Sedimentation 2-point peroxide	ns	38
[Silt | Sand]	Sedimentation 2-point No peroxide	Laser 0 min	****	46
[Silt | Sand]	Sedimentation 2-point No peroxide	Laser 2 min	*	106
[Silt | Sand]	Sedimentation 2-point No peroxide	Sedimentation multi-point No peroxide	**	763
[Silt | Sand]	Sedimentation 2-point No peroxide	Sedimentation multi-point peroxide	*	206
Sand	Sedimentation 2-point No peroxide	Sieving	*	746
Sand	Sedimentation 2-point peroxide	Sieving	ns	26
Sand	Laser 0 min	Sieving	****	34
Sand	Laser 2 min	Sieving	*	77
Sand	Sedimentation multi-point No peroxide	Sieving	ns	358
Sand	Sedimentation multi-point peroxide	Sieving	****	84

ns: non-significant (> 0.05),

*: significant at p ≤ 0.05,

**: significant at p ≤ 0.01,

***: significant at p ≤ 0.005,

****: significant at p ≤ 0.001,

N: Sample size.