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

Table 1

Mean and standard errors for soil physical properties of onion fields under furrow- and drip-irrigation systems in NM in 2006.

Irrigation System	Depth cm	Sand %	Silt %	Clay %	Soil type	BD g/cm^3	𝐾𝑠 cm/hr
Furrow irrigated	0–10	56.5 ± 0.00	22.8 ± 0.35	20.7 ± 0.35	Sandy clay loam	1.3 ± 0.02	1.92 ± 0.20
	10–30	53.5 ± 0.35	25.6 ± 0.53	20.9 ± 0.18	Sandy clay loam	1.4 ± 0.04	2.02 ± 0.22
	30–40	52.3 ± 0.18	27.5 ± 0.18	20.2 ± 0.00	Sandy clay loam	1.4 ± 0.05	2.13 ± 0.34
	40–60	54.8 ± 0.71	25.2 ± 0.71	20.0 ± 0.00	Sandy clay loam	1.5 ± 0.13	3.23 ± 1.10
	60–85	90.3 ± 1.94	5.5 ± 1.59	4.2 ± 0.35	Sand	—	—
	85–110	95.8 ± 0.00	1.0 ± 0.00	3.2 ± 0.00	Sand	—	—
Drip irrigated	0–10	50.8±0.35	27.0±0.35	22.2 ± 0.00	Sandy clay loam	1.2 ± 0.03	1.52 ± 0.42
	10–30	49.8 ± 0.00	27.0 ± 0.00	23.2 ± 0.00	Sandy clay loam	1.4 ± 0.06	1.43 ± 0.20
	30–40	46.8 ± 1.77	34.0 ± 2.83	19.2 ± 1.06	Sandy clay loam	1.4 ± 0.13	1.34 ± 0.23
	40–60	55.3 ± 1.24	24.3 ± 0.35	20.4 ± 1.59	Sandy clay loam	1.4 ± 0.05	4.09 ± 0.9
	60–85	31.8 ± 4.24	55.0 ± 3.54	13.2 ± 0.71	Silt loam	—	—
	85–110	88.2 ± 1.13	7.8 ± 0.55	4.0 ± 0.22	Sand	—	—

BD: bulk density, 𝐾_𝑠: saturated hydraulic conductivity, and —: value not determined.