The
University of Arizona
Subsurface
Drip Irrigation
Demonstration and Research Project
Department
of Soil, Water,
and Environmental Science
and Environmental Science
|
The
University of Arizona |
| Subsurface
Drip Irrigation |
|
|
Department
of Soil, Water, and Environmental Science |
 |
 |
 |
 |
 |
Comparison
of AZdrip Project Results for the
First
Ten Seasons of Conventional Production
Table
1. Potential Irrigation Configurations
Table 2. AZdrip Growing Seasons and Yields
Table 3. AZdrip Crop Water Use
Table 4. AZdrip Seasonal Water Use Efficiency
Table 1. Potential Irrigation Configurations
| Plot 1 | High frequency irrigation. Ten permanent 80" (2.0 m) beds containing three drip lines spaced 19" (48cm) apart and 9" (23 cm) deep. |
| Plot 2 | High frequency irrigation. May be configured as twenty 40" (1.0 m) beds with a single drip or ten 80" (2.0 m) beds with two drip lines spaced 40" (1.0 m) apart and 9" (23 cm) deep. The configuration is dependent on the crop. |
| Plot 3 | Low frequency irrigation. Ten permanent 80" (2.0 m) beds containing three drip lines spaced 19" (48cm) apart and 9" (23 cm) deep. |
| Plot 4 | Surface irrigation. May be configured as twenty 40" (1.0 m) beds or ten 80" (2.0 m) beds, or a single basin depending on the standard practice for the crop. |
| Plot 5 | Low frequency irrigation. May be configured as twenty 40" (1.0 m) beds with a single drip or ten 80" (2.0 m) beds with two drip lines spaced 40" (1.0 m) apart and 9" (23 cm) deep. The configuration is dependent on the crop. |
|
Crop |
Season |
HF SDI 80" |
HF SDI 40" |
LF SDI 80" |
LF SDI 40" |
Surface Irrigation |
kg
yield/ha (lbs/ac) |
||||||
Broccoli |
2002-03 |
22700 (20250) |
24340 (21710) |
23440 (20910) |
20770 (18530) |
21310 (19010) |
Broccoli |
2003-04 |
29310 (26150) |
42090 (37550) |
31260 (27890) |
35130 (31340) |
24260 (21650) |
Broccoli |
2004-05 |
15380 (13720) |
11470 (10230) |
13790 (12300) |
12670 (11300) |
9190 (8200) |
kg
yield/ha (lbs/ac) |
||||||
Watermelon |
2003 |
58670 (52340) |
45340 (40450) |
44260 (39480) |
33810 (30160) |
20880 (18630) |
Watermelon |
2005 |
57000 (50850) |
51960 (46350) |
30290 (27020) |
32660 (29140) |
13090 (11680) |
Watermelon |
2006 |
10930 (9750) |
3930 (3500) |
8950 (7980) |
3670 (3270) |
890 (790) |
kg
yield/ha (lbs/ac) |
||||||
Barley |
2005-06 |
3930 (3500) |
4330 (3860) |
5380 (4800) |
5110 (4560) |
6150 (5490) |
Papago
Peas |
2006-07 |
cover
crop tilled under |
||||
kg
yield/ha (lbs/ac) |
||||||
Cotton
(lint) |
2007 |
2820 (2520) |
2800 (2500) |
2130 (1900) |
1710 (1525) |
1760 (1570) |
| Cotton (lint) | 2008 | 3110
(2830) |
2940
(2670) |
2890
(2630) |
2890
(2630) |
2940
(2670) |
Table 3. AZdrip Crop Water Use
| Crop | Season | HF SDI 80" | HF SDI 40" | LF SDI 80" | LF SDI 40" | Surface Irrigation |
| cm/ha (in/ac) | ||||||
| Broccoli | 2002-03 | 137.4 (21.9) | 131.7 (21.0) | 137.4 (21.9) | 135.4 (21.6) | 135.8 (21.7) |
| Broccoli | 2003-04 | 73.4 (11.7) | 65.9 (10.5) | 78.4 (12.5) | 72.1 (11.5) | 89.7 (14.3) |
| Broccoli | 2004-05 | 87.9 (14.0) | 96.6 (15.4) | 86.0 (13.7) | 82.2 (13.1) | 128.0 (20.4) |
| cm/ha (in/ac) | ||||||
| Watermelon | 2003 | 193.2(30.8) | 173.2(27.6) | 179.4(28.6) | 165.6(26.4) | 193.9(30.9) |
| Watermelon | 2005 | 143.7(22.9) | 142.4(22.7) | 143.7(22.9) | 124.2(19.8) | 127.4(20.3) |
| Watermelon | 2006 | - | - | - | - | - |
| cm/ha (in/ac) | ||||||
| Barley | 2005-06 | 111.7(17.8) | 119.8(19.1) | 103.5(16.5) | 118.6(18.9) | 75.3(12) |
| cm/ha (in/ac) | ||||||
| Cotton | 2007 | 315 (50.2) | 377 (60.1) | 297 (47.4) | 272 (43.3) | 323 (51.4) |
| Cotton | 2008 | 272 (43.3) | 265 (42.2) | 259(41.2) | 258 (41.1) | 280 (44.6) |
Table 4. AZdrip Seasonal Water Use Efficiency
| Crop |
Season |
HF
SDI 80" |
HF
SDI 40" |
LF
SDI 80" |
LF
SDI 40" |
Surface
Irrigation |
kg
yield / cm water (lbs yield/inch water) |
||||||
Broccoli |
2002-03 |
165
(925) |
185
(1034) |
171
(955) |
153
(858) |
157
(880) |
Broccoli |
2003-04 |
399
(2235) |
639
(3576) |
399
(2231) |
487
(2725) |
392
(1514) |
Broccoli |
2004-05 |
175
(980) |
119
(664) |
160
(898) |
154
(863) |
72
(402) |
kg
yield / cm water (lbs yield/inch water) |
||||||
Watermelon |
2003 |
304
(1699) |
262
(1466) |
247
(1380) |
204
(1142) |
193.9(603) |
Watermelon |
2005 |
397
(2221) |
365
(2042) |
211
(1180) |
263
(1472) |
103
(575) |
Watermelon |
2006 |
- |
- |
- |
- |
- |
kg
yield / cm water (lbs yield/inch water) |
||||||
Barley |
2005-06 |
35
(197) |
36
(202) |
52
(291) |
43
(241) |
82
(458) |
kg
yield / cm water (lbs yield/inch water) |
||||||
Cotton |
2007 |
9
(50) |
7
(42) |
7
(40) |
6
(35) |
5
(30) |
| Cotton | 2008 | 11.4
(65)
|
11.1
(63)
|
11.2
(63)
|
11.2
(64)
|
10.5
(60)
|
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 Arizona Crop Information Site |
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