Table 3.
Effects of water and nitrogen regulation on yield and economic efficiency in LB||AS.
| Year | Treatment | Alfalfa | Lycium barbarum | Economic Benefits /×104 USD·ha−1 |
||||
|---|---|---|---|---|---|---|---|---|
| First Crop/kg·ha−1 | Second Crop/kg·ha−1 | Third Crop/kg·ha−1 | Total Yield/kg·ha−1 | Hundred-Grain Weight/g | Yield/kg·ha−1 | |||
| 2022 | W0N0 | 5761 ± 124.3 d | 2809 ± 103.36 g | 1868 ± 74.49 cde | 10,438 ± 204.52 fg | 16.26 ± 0.75 f | 1902 ± 39.33 f | 1.18 |
| W0N1 | 6455 ± 128.13 c | 3297 ± 87.26 cde | 2189 ± 96.74 b | 11,941 ± 152.18 cd | 18.05 ± 1.02 cdef | 2255 ± 41.17 d | 1.38 | |
| W0N2 | 7467 ± 170.82 a | 3755 ± 83.68 a | 2407 ± 122.28 a | 13,628 ± 223.49 a | 20.03 ± 1.61 abcd | 2623 ± 82.04 a | 1.60 | |
| W0N3 | 6938 ± 180.29 b | 3584 ± 53.1 b | 2258 ± 120 ab | 12,779 ± 144.78 b | 19.13 ± 1.3 abcde | 2451 ± 85.38 bc | 1.50 | |
| W1N0 | 5607 ± 154.53 d | 2870 ± 56.02 g | 1770 ± 122.28 def | 10,247 ± 240.58 g | 16.92 ± 0.28 ef | 1900 ± 76.79 f | 1.17 | |
| W1N1 | 6511 ± 128 c | 3206 ± 78.34 de | 1992 ± 66.83 c | 11,710 ± 185.94 d | 18.55 ± 0.56 bcdef | 2248 ± 36.25 d | 1.37 | |
| W1N2 | 6964 ± 161.75 b | 3621 ± 97.2 b | 2287 ± 75.36 ab | 12,872 ± 249.86 b | 20.83 ± 1.7 ab | 2521 ± 62.07 ab | 1.54 | |
| W1N3 | 6661 ± 212.08 c | 3326 ± 90.08 cd | 2154 ± 92.42 b | 12,141 ± 153.4 c | 20.3 ± 1.3 abc | 2340 ± 64.85 cd | 1.43 | |
| W2N0 | 5147 ± 91.01 e | 2560 ± 35.52 h | 1642 ± 144.5 f | 9349 ± 167.92 h | 17.57 ± 1.12 def | 1873 ± 66.76 f | 1.14 | |
| W2N1 | 5859 ± 85.38 d | 2781 ± 68.08 g | 1764 ± 100.63 def | 10,403 ± 79.02 g | 19.78 ± 1.87 abcd | 1987 ± 40.8 f | 1.22 | |
| W2N2 | 6649 ± 190.95 c | 3365 ± 80.61 c | 1918 ± 132.42 cd | 11,932 ± 178.45 cd | 19.74 ± 1.49 abcd | 2118 ± 98.76 e | 1.32 | |
| W2N3 | 6410 ± 150.39 c | 3180 ± 72.64 e | 1725 ± 87.09 ef | 11,316 ± 260.4 e | 18.59 ± 1.15 bcdef | 1995 ± 74.6 f | 1.24 | |
| W3N0 | 4532 ± 124.44 f | 2414 ± 57.87 i | 1427 ± 74.64 g | 8373 ± 21.85 i | 19.5 ± 1.79 abcd | 1425 ± 63.94 i | 0.89 | |
| W3N1 | 5180 ± 174.91 e | 2842 ± 71.57 g | 1632 ± 31.2 f | 9654 ± 274.76 h | 21.24 ± 1.62 a | 1567 ± 64.12 h | 0.99 | |
| W3N2 | 5802 ± 125.01 d | 3232 ± 104.89 cde | 1721 ± 77.51 ef | 10,756 ± 130.09 f | 21.05 ± 1.09 ab | 1690 ± 94.01 g | 1.08 | |
| W3N3 | 5711 ± 204.16 d | 3004 ± 73.38 f | 1467 ± 66.49 g | 10,182 ± 229.81 g | 20.01 ± 0.56 abcd | 1566 ± 68.18 h | 1.00 | |
| 2023 | W0N0 | 4125 ± 243.37 ef | 3729 ± 159.86 fgh | 2802 ± 140.34 ef | 10,656 ± 533.76 fgh | 20.17 ± 1.07 e | 2324 ± 152.87 cd | 1.51 |
| W0N1 | 5103 ± 292.56 bc | 4348 ± 255.01 abc | 3608 ± 160.75 ab | 13,059 ± 700 abc | 27.45 ± 0.95 a | 3067 ± 135.94 ab | 1.67 | |
| W0N2 | 5234 ± 393.79 ab | 4415 ± 210.06 ab | 3668 ± 214.91 ab | 13,317 ± 814.79 ab | 27.65 ± 0.80 a | 3238 ± 97.36 a | 2.07 | |
| W0N3 | 4797 ± 221.35 bcd | 4064 ± 152.19 cde | 3204 ± 169.37 cd | 12,065 ± 541.77 cd | 23.52 ± 0.76 c | 2539 ± 214.59 c | 1.97 | |
| W1N0 | 3608 ± 241.41 gh | 3367 ± 249.63 i | 2595 ± 192.73 fg | 9570 ± 671.38 | 17.81 ± 0.56 g | 2171 ± 189.68 de | 1.41 | |
| W1N1 | 5005 ± 345.42 bc | 4343 ± 121.76 abc | 3436 ± 121.34 bc | 12,784 ± 588.28 bc | 25.70 ± 0.61 b | 3019 ± 108.31 b | 1.62 | |
| W1N2 | 5573 ± 166.76 a | 4595 ± 137.07 a | 3902 ± 103.6 a | 14,071 ± 405.08 a | 26.57 ± 0.78 ab | 3046 ± 105.39 b | 1.99 | |
| W1N3 | 4749 ± 261.4 cd | 4007 ± 130.13 def | 3211 ± 316.65 cd | 11,968 ± 698.59 cde | 22.11 ± 0.97 d | 2440 ± 96.57 c | 1.94 | |
| W2N0 | 3357 ± 185.34 hi | 3063 ± 136.67 j | 2510 ± 165.34 fg | 8931 ± 483.09 ij | 15.41 ± 0.56 hi | 1836 ± 123.64 f | 1.21 | |
| W2N1 | 4246 ± 164.45 ef | 3806 ± 131.02 efgh | 2864 ± 185.98 def | 12,510 ± 617.45 bcd | 19.90 ± 0.55 e | 2386 ± 94.51 cd | 1.32 | |
| W2N2 | 4960 ± 314.23 bc | 4236 ± 135.24 bcd | 3314 ± 171.43 bc | 10,916 ± 494.77 efg | 22.26 ± 0.57 d | 2489 ± 88.66 c | 1.61 | |
| W2N3 | 3996 ± 108.56 fg | 3605 ± 135.32 ghi | 2759 ± 188.58 ef | 10,361 ± 429.37 fgh | 15.87 ± 0.56 h | 1963 ± 182.8 ef | 1.60 | |
| W3N0 | 3171 ± 260.66 i | 2915 ± 262.24 j | 2310 ± 241.92 g | 8395 ± 760.80 j | 14.44 ± 0.41 i | 1575 ± 184.9 g | 1.06 | |
| W3N1 | 4490 ± 143.95 de | 3878 ± 132.48 efg | 3902 ± 103.14 cde | 12,456 ± 574.51 bcd | 18.6 ± 0.95 fg | 2274 ± 117.7 cd | 1.40 | |
| W3N2 | 4931 ± 156.92 bc | 4209 ± 240.63 bcd | 3317 ± 180.45 bc | 11,418 ± 691.59 def | 19.26 ± 0.39 ef | 2282 ± 97.24 cd | 1.52 | |
| W3N3 | 3888 ± 165.73 fg | 3504 ± 181.22 hi | 2688 ± 246.32 efg | 10,080 ± 592.26 gh | 16.58 ± 0.65 h | 2133 ± 193.08 de | 1.54 | |
Note: Different lowercase letters indicate that there are significant differences between different nitrogen application rates under the same irrigation amount (p < 0.05). Economic efficiency = total income (Lycium barbarum, alfalfa) − costs (labor, utilities, fertilizer, pesticides, etc.).