Effects of Foliar Fertilization on Nutrient Uptake, Yield, and Fruit Quality of Pomelo (Citrus grandis Osbeck) Grown in the Mekong Delta Soils

Table 1

Initial physicochemical properties of the experimental soils.

Parameter	Unit	HG A		HG B		HG C
		0-20 cm	20-50 cm	0-20 cm	20-50 cm	0-20 cm	20-50 cm
pHH2O		5.62	6.15	4.22	4.84	5.27	5.61
EC	mS cm^−1	0.13	0.14	0.19	0.10	0.33	0.15
Available phosphorus	mg kg^−1	20.0	12.2	30.2	12.8	25.0	9.47
Total nitrogen	%	0.10	0.12	0.11	0.13	0.18	0.15
Soil organic matter	%	2.57	3.06	2.70	2.30	3.91	4.25
Exchangeable cations
Na^+	meq 100g^−1	0.23	0.42	0.18	0.41	0.41	0.71
K^+		0.60	0.45	0.73	0.39	0.66	0.50
Ca^2+		10.2	9.01	6.67	10.0	11.6	12.9
Mg^2+		4.66	5.12	2.60	4.61	5.54	5.58
CEC	meq 100g^−1	21.8	20.1	19.1	19.6	21.9	20.7
Bulk density	g cm^−3	1.18	1.16	1.25	1.15	1.10	1.18
Soil texture
Sand	%	0.50	1.00	0.50	1.10	0.20	0.70
Silt		49.5	34.0	43.8	41.9	44.6	45.5
Clay		50.0	65.0	55.7	57.0	55.2	53.8