. 2018 Oct 3;8:14743. doi: 10.1038/s41598-018-33040-7

Table 1.

Mean values of soil electrical conductivity (EC), pH and soil organic matter (SOM) content for different biochar amendments and irrigation regimes during the 2014 and 2015 tomato growing seasons.

Irrigation regime	Biochar treatment	EC (dS m⁻¹)		pH		SOM (g kg⁻¹)
Irrigation regime	Biochar treatment	2014	2015	2014	2015	2014	2015
I₀	B₁	0.20^cD	0.57^cC	8.44^aB	8.46^aB	2.70^aC	2.71^aD
	B₂	0.45^cC	0.75^cB	8.65^aA	8.69^aA	3.30^aB	3.40^aC
	B₃	0.72^cB	0.72^cB	8.68^aA	8.71^aA	3.51^aA	3.81^aB
	B₄	0.82^cA	0.94^cA	8.70^aA	8.73^aA	3.67^aA	4.10^aA
I₁	B₁	0.85^bD	1.05^bD	8.41^bB	8.42^bB	2.50^bC	2.63^bC
	B₂	1.18^bC	1.61^bC	8.54^bA	8.55^bA	2.80^bC	3.10^bB
	B₃	1.28^bB	1.90^bB	8.56^bA	8.56^bA	3.14^bB	3.34^bB
	B₄	1.40^bA	2.10^bA	8.56^bA	8.58^bA	3.44^bA	3.71^bA
I₂	B₁	1.64^aD	1.90^aC	8.31^cA	8.33^cB	2.30^cC	2.42^cC
	B₂	1.82^aC	1.99^aC	8.40^cA	8.42^cA	2.40^cB	2.70^cB
	B₃	2.15^aB	2.40^aB	8.43^cA	8.44^cA	2.45^cB	2.73^cB
	B₄	2.25^aA	2.72^aA	8.45^cA	8.46^cA	2.76^cA	2.90^cA
Biochar		***	***	ns	ns	***	***
Salinity		***	***	*	*	**	**
Interaction		ns	ns	ns	ns	ns	ns

Note: In each column, different uppercase and lowercase letters indicate a significant difference among the biochar application rates and irrigation salinity levels, respectively, at P < 0.05 (Least significant difference, LSD); Analysis of variance (ANOVA): ns, not significant; *, **, and ***, denote significance at P ≤ 0.05, P ≤ 0.01, and P ≤ 0.001, respectively. B₁, B₂, B₃ and B₄ represent mixtures of soil with 0%, 2%, 4% and 8% of biochar by mass. I₀, I₁ and I₂ represent irrigation water salinity of tap water, 1 and 3 dS m⁻¹.