Applied and Environmental Soil Science

Research Article

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

Table 5

(a) Date of irrigation, total amount of water applied (TWA), initial and final volumetric water content, rooting depth (RD), available water content (AWC), amount of leaching (LA), depth of leaching (LAD), cumulative leaching below root zone depth (CLRBRZD), and depth of water front (DWF) during onion growing season 1 (2006-07) in a drip-irrigated onion field in NM. (b) Date of irrigation, total amount of water applied (TWA), initial and final volumetric water content, rooting depth (RD), available water content (AWC), amount of leaching (LA), depth of leaching (LAD), cumulative leaching below root zone depth (CLRBRZD), and depth of water front (DWF) during onion growing season 2 (2008) in a drip-irrigated onion field in NM.

(a)


Date of irrigation	TWA cm	cm³ cm⁻³	cm³ cm⁻³	RD cm	AWC cm	LA cm	LAD cm	CLRBRZD cm	DWF cm

9/29/2006	3.43	0.16	0.31	10.0	Bring root zone to field capacity				10
9/30/2006	4.20	0.29	0.32	10.0	0.35	3.85	12.4	12.4	22
10/3/2006	4.69	0.25	0.32	10.0	0.70	3.99	12.9	25.3	35
10/5/2006	3.80	0.28	0.31	10.0	0.35	3.45	11.1	36.4	46
10/6/2006	2.09	0.29	0.32	10.0	0.34	1.76	5.7	42.1	52
10/22/2006	4.61	0.23	0.32	10.0	0.87	3.74	12.1	54.2	64
10/30/2006	2.09	0.25	0.31	10.0	0.61	1.48	4.8	58.9	69
10/31/2006	0.83	0.29	0.30	10.0	0.17	0.66	2.1	61.0	71
11/9/2006	1.95	0.23	0.31	10.0	0.78	1.17	3.8	64.8	75
11/18/2006	1.95	0.24	0.32	10.0	0.78	1.17	3.8	68.6	79
11/25/2006	2.04	0.25	0.32	10.0	0.70	1.34	4.3	72.9	83
12/3/2006	1.02	0.26	0.30	10.0	0.36	0.66	2.1	75.0	85
12/8/2006	1.01	0.26	0.30	10.0	0.36	0.65	3.6	78.6	89
12/16/2006	1.77	0.27	0.30	10.0	0.26	1.51	8.4	87.0	97
12/24/2006	0.80	0.27	0.30	10.0	0.35	0.45	2.5	89.5	100
1/13/2007	1.13	0.26	0.32	10.0	0.61	0.52	2.9	92.4	103
2/4/2007	1.01	0.26	0.31	10.0	0.52	0.49	2.7	95.1	105
2/10/2007	1.65	0.25	0.32	10.0	0.70	0.95	5.3	100.4	111
2/20/2007	0.80	0.26	0.30	10.0	0.35	0.45	2.5	102.9	113
3/2/2007	1.64	0.25	0.32	12.7	1.01	0.63	3.5	106.4	117
3/10/2007	1.43	0.25	0.29	17.8	0.62	0.81	4.5	110.9	121
3/14/2007	1.29	0.26	0.30	22.9	0.80	0.49	2.7	113.7	124
3/19/2007	1.32	0.27	0.31	27.9	1.15	0.17	1.0	114.7	125
3/23/2007	1.53	0.27	0.30	30.5	0.80	0.73	4.1	118.7	129
3/27/2007	1.87	0.27	0.30	35.6	1.24	0.63	3.5	122.2	132
3/30/2007	1.35	0.28	0.31	38.1	1.50	0.00	0.0	122.2	132
4/4/2007	2.28	0.27	0.31	45.7	2.24	0.04	0.2	122.4	133
4/8/2007	0.99	0.27	0.29	45.7	1.12	0.00	0.0	122.4	133
4/11/2007	2.02	0.27	0.31	45.7	1.99	0.03	0.2	122.6	133
4/16/2007	2.54	0.27	0.31	45.7	2.25	0.29	1.6	124.2	134
4/23/2007	1.89	0.26	0.30	45.7	1.86	0.03	0.2	124.4	134
4/24/2007	1.35	0.30	0.32	45.7	1.14	0.21	1.2	125.6	136
4/26/2007	1.94	0.29	0.32	45.7	1.81	0.13	0.7	126.3	136
5/5/2007	3.22	0.25	0.31	45.7	3.09	0.13	0.7	127.1	137
5/11/2007	1.31	0.27	0.30	45.7	1.19	0.12	0.7	127.7	138
5/14/2007	1.49	0.26	0.29	45.7	1.19	0.30	1.7	129.4	139
5/21/2007	2.70	0.25	0.30	45.7	2.39	0.31	1.7	131.1	141
5/24/2007	0.30	0.27	0.30	45.7	1.25	0.00	0.0	131.1	141
5/25/2007	2.05	0.28	0.31	45.7	1.59	0.46	2.5	133.7	144
5/31/2007	2.02	0.25	0.30	45.7	1.99	0.03	0.2	133.8	144
6/1/2007	2.20	0.28	0.31	45.7	1.59	0.61	3.4	137.2	147
6/7/2007	1.16	0.25	0.30	45.7	2.11	0.00	0.0	137.2	147

(b)


Date of irrigation	TWA cm	cm³ cm⁻³	cm³ cm⁻³	RD cm	AWC cm	LA cm	LAD cm	CLRBRZD cm	DWF cm

3/1/2008	3.43	0.16	0.31	10.0	Bring root zone to field capacity				10
3/3/2008	2.15	0.27	0.32	10.0	0.55	1.60	5.2	5.2	15
3/6/2008	3.06	0.26	0.33	10.0	0.70	2.36	7.6	12.8	23
3/12/2008	1.90	0.26	0.31	10.0	0.55	1.35	4.4	17.2	27
3/17/2008	1.79	0.28	0.32	10.0	0.44	1.36	4.4	21.6	32
3/20/2008	1.54	0.25	0.31	10.0	0.57	0.97	3.1	24.7	35
3/25/2008	2.19	0.24	0.30	10.0	0.61	1.58	5.1	29.8	40
3/31/2008	1.02	0.27	0.31	10.0	0.47	0.55	1.8	31.6	42
4/3/2008	1.72	0.24	0.31	10.0	0.68	1.04	3.3	34.9	45
4/7/2008	2.05	0.25	0.33	10.0	0.78	1.27	4.1	39.0	49
4/9/2008	1.62	0.26	0.32	10.0	0.60	1.02	3.3	42.3	52
4/14/2008	1.13	0.24	0.30	10.0	0.56	0.57	1.8	44.1	54
4/17/2008	0.91	0.27	0.29	10.0	0.23	0.68	2.2	46.3	56
4/22/2008	1.57	0.26	0.31	10.0	0.46	1.11	3.6	49.9	60
4/25/2008	1.15	0.26	0.30	10.0	0.45	0.70	2.3	52.2	62
4/28/2008	1.33	0.27	0.31	10.0	0.41	0.92	3.0	55.1	65
5/1/2008	1.21	0.27	0.32	10.0	0.52	0.69	2.2	57.3	67
5/7/2008	1.25	0.25	0.31	10.0	0.60	0.65	2.1	59.5	69
5/12/2008	1.20	0.25	0.31	10.0	0.55	0.65	2.1	61.6	72
5/15/2008	1.21	0.27	0.32	12.7	0.76	0.45	1.5	63.0	73
5/20/2008	1.23	0.25	0.30	17.8	0.80	0.43	1.4	64.4	74
5/22/2008	1.37	0.26	0.31	22.9	1.02	0.34	1.1	65.5	76
5/26/2008	1.41	0.26	0.31	27.9	1.43	0.00	0.0	65.5	76
5/30/2008	1.13	0.27	0.30	30.5	0.80	0.33	1.1	66.6	77
6/3/2008	1.32	0.26	0.30	35.6	1.59	0.00	0.0	66.6	77
6/6/2008	2.21	0.27	0.32	38.1	2.27	0.00	0.0	66.6	77
6/10/2008	2.34	0.26	0.33	45.7	3.61	0.00	0.0	66.6	77
6/14/2008	2.43	0.28	0.31	45.7	1.57	0.86	2.8	69.4	79
6/18/2008	2.06	0.26	0.32	45.7	2.90	0.00	0.0	69.4	79
6/23/2008	3.14	0.27	0.31	45.7	2.25	0.89	4.9	74.3	84
6/27/2008	1.71	0.26	0.31	45.7	2.32	0.00	0.0	74.3	84
6/30/2008	1.22	0.29	0.32	45.7	1.60	0.00	0.0	74.3	84
7/3/2008	2.45	0.28	0.32	45.7	2.26	0.19	1.0	75.4	85
7/8/2008	2.92	0.25	0.31	45.7	3.09	0.00	0.0	75.4	85
7/14/2008	1.71	0.25	0.30	45.7	2.11	0.00	0.0	75.4	85
7/18/2008	1.63	0.26	0.29	45.7	1.19	0.44	2.4	77.8	88
7/22/2008	2.52	0.26	0.30	45.7	1.93	0.59	3.3	81.1	91
7/25/2008	1.72	0.27	0.29	45.7	1.12	0.60	3.4	84.4	94
7/29/2008	2.55	0.27	0.31	45.7	2.05	0.50	2.8	87.2	97
8/1/2008	2.41	0.27	0.30	45.7	1.07	1.34	7.4	94.6	105