Effects of Biochar, Lime, and Compost Applications on Soil Physicochemical Properties and Yield of Pomelo (Citrus grandis Osbeck) in Alluvial Soil of the Mekong Delta

Table 2

Effects of soil amendments and years on soil properties in topsoil (0–20 cm).

Factors		pH	SOM (%)	Ca^2+	K^+	Mg^2+	BD (g cm^−3)
				cmolc kg^−1
(A) Soil amendments	Control	4.91^c	2.87^c	2.84^c	0.64	3.95^c	1.18^c
	Biochar	5.36^b	3.82^a	4.01^b	0.61	4.71^b	0.99^a
	Lime	5.34^b	3.04^b	4.41^a	0.61	4.91^a	1.05^b
	Compost	5.54^a	3.92^a	4.54^a	0.66	4.92^a	0.96^a
(B) Years	2018	5.19^b	3.39	3.79^b	0.57^b	4.39^c	1.07^b
	2019	5.25^b	3.39	3.92^ab	0.65^a	4.66^b	1.04^a
	2020	5.41^a	3.45	4.13^a	0.67^a	4.82^a	1.01^a
F (A)					ns
F (B)			ns
F (A × B)					ns

Different letters in the same column indicate significant differences at , , and ; ns indicates no significant difference at . Control, NPK fertilizer; biochar, NPK fertilizer + 5 ton·ha⁻¹·yr⁻¹ of biochar; lime, NPK fertilizer + 2 ton·ha⁻¹·yr⁻¹ of lime; compost, NPK fertilizer + 5 ton·ha⁻¹·yr⁻¹ of compost.