Nitrate-Nitrogen Leaching from Onion Bed under Furrow and Drip Irrigation Systems

Table 2

Soil chemical properties of two onion fields at the Plant Science Research Center (PSRC) and Fabian Garcia Research Center (FGRC) in NM in 2006.

Irrigation system	Depth cm	pH	EC𝑒 dS/m	SAR	ESP %	OM %	P ppm	K ppm
Furrow irrigated	0–10	7.3	2.10	3.54	3.80	0.58	16.70	83.0
	10–30	7.3	1.81	1.97	1.60	0.61	17.40	61.0
	30–40	7.4	1.89	1.38	0.80	0.48	9.90	51.0
	40–60	7.5	2.19	1.56	1.00	0.04	2.30	34.0
	60–85	7.8	1.02	2.00	1.70	0.03	2.80	32.0
	85–110	8.2	0.51	2.52	2.40	0.00	1.50	26.0
Drip irrigated	0–10	7.7	2.31	3.52	3.80	1.44	62.50	137.0
	10–30	7.6	1.80	3.48	3.70	1.38	54.60	118.0
	30–40	7.5	2.33	3.88	4.30	1.67	88.90	138.0
	40–60	7.6	1.59	3.11	3.20	0.61	19.90	84.0
	60–85	7.7	1.85	3.14	3.30	0.43	7.20	79.00
	85–110	7.8	2.04	4.19	4.70	0.24	2.60	46.00

EC_𝑒: electrical conductivity of saturated extract, SAR: sodium adsorption ratio, ESP: exchangeable sodium percentage, OM: organic matter, P: phosphorous, and K: potassium.