Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (4): 32-42.DOI: 10.11686/cyxb2021077
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Hong-ren SUN1(), Xian-guo WANG1, Yao-jun BU2, Nan QIAO2, Bo REN3
Received:
2021-03-01
Revised:
2021-04-06
Online:
2022-04-20
Published:
2022-01-25
Contact:
Hong-ren SUN
Hong-ren SUN, Xian-guo WANG, Yao-jun BU, Nan QIAO, Bo REN. Preliminary study of a sufficiency index of soil N and recommended N fertilizer application rates for alfalfa in the Loess Plateau of China[J]. Acta Prataculturae Sinica, 2022, 31(4): 32-42.
Fig.1 The regression relation between relative yields without N treatment and the concentration of soil alkaline hydrolysis nitrogen for alfalfa in the Loess Plateau
Fig.2 The regression relation between relative yields without N treatment and the concentration of soil total nitrogen for alfalfa in the Loess Plateau
Fig.3 The regression relation between relative yields without N treatment and the concentration of soil organic matter for alfalfa in the Loess Plateau
养分 Nutrients | 生长年限 Growing years | 模型 Models | 回归方程 Regression equations | 样本数Sample number (n) | 相关系数 Correlation coefficient (r) | 缺氮处理相对产量 Relative yields without N treatment (%) | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
50 | 60 | 70 | 80 | 90 | 95 | 100 | ||||||
碱解氮 Alkaline hydrolysis nitrogen (mg·kg-1) | A+B | L | y=0.5012x+63.66 | 42 | 0.5935** | 32.6 | 52.6 | 62.5 | 72.5 | |||
N | y=26.247ln x-11.415 | 42 | 0.6297** | 32.6 | 47.7 | 57.7 | 69.8 | |||||
A | L | y=0.4486x+66.921 | 30 | 0.3801* | 29.2 | 51.5 | 62.6 | |||||
N | y=19.413ln x+14.026 | 30 | 0.4093* | 29.9 | 50.1 | 64.8 | ||||||
B | L | y=0.5793x+56.43 | 12 | 0.7115** | 40.7 | 58.0 | 66.6 | 75.2 | ||||
N | y=31.855ln x-34.84 | 12 | 0.7938** | 26.9 | 36.8 | 50.4 | 58.9 | 68.9 | ||||
全氮 Total nitrogen (g·kg-1) | A+B | L | y=14.229x+73.366 | 73 | 0.2552* | 0.47 | 1.17 | 1.52 | ||||
N | y=8.433ln x+86.794 | 73 | 0.2180ns | 0.45 | 1.46 | |||||||
A | L | y=7.6476x+77.954 | 55 | 0.1175ns | ||||||||
N | y=3.1583ln x+84.415 | 55 | 0.0819ns | |||||||||
B | L | y=24.232x+64.174 | 18 | 0.5008* | 0.65 | 1.07 | 1.27 | 1.48 | ||||
N | y=25.841ln x+90.97 | 18 | 0.5773* | 0.65 | 0.96 | 1.17 | 1.42 | |||||
有机质 Organic matter (g·kg-1) | A+B | L | y=1.2736x+73.534 | 79 | 0.3089** | 5.1 | 12.9 | 16.9 | ||||
N | y=13.53ln x+55.867 | 79 | 0.3581** | 6.0 | 12.5 | |||||||
A | L | y=0.5911x+81.239 | 58 | 0.1378ns | 14.7 | |||||||
N | y=7.0091ln x+71.395 | 58 | 0.1836ns | 14.2 | ||||||||
B | L | y=2.1529x+61.524 | 21 | 0.5470* | 8.6 | 13.2 | 15.6 | |||||
N | y=21.999ln x+34.462 | 21 | 0.5948** | 5.0 | 7.9 | 12.5 | 15.7 |
Table 1 The regression equations between relative yields without N treatment and soil N concentration and several critical values of soil N concentration for alfalfa in the Loess Plateau
养分 Nutrients | 生长年限 Growing years | 模型 Models | 回归方程 Regression equations | 样本数Sample number (n) | 相关系数 Correlation coefficient (r) | 缺氮处理相对产量 Relative yields without N treatment (%) | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
50 | 60 | 70 | 80 | 90 | 95 | 100 | ||||||
碱解氮 Alkaline hydrolysis nitrogen (mg·kg-1) | A+B | L | y=0.5012x+63.66 | 42 | 0.5935** | 32.6 | 52.6 | 62.5 | 72.5 | |||
N | y=26.247ln x-11.415 | 42 | 0.6297** | 32.6 | 47.7 | 57.7 | 69.8 | |||||
A | L | y=0.4486x+66.921 | 30 | 0.3801* | 29.2 | 51.5 | 62.6 | |||||
N | y=19.413ln x+14.026 | 30 | 0.4093* | 29.9 | 50.1 | 64.8 | ||||||
B | L | y=0.5793x+56.43 | 12 | 0.7115** | 40.7 | 58.0 | 66.6 | 75.2 | ||||
N | y=31.855ln x-34.84 | 12 | 0.7938** | 26.9 | 36.8 | 50.4 | 58.9 | 68.9 | ||||
全氮 Total nitrogen (g·kg-1) | A+B | L | y=14.229x+73.366 | 73 | 0.2552* | 0.47 | 1.17 | 1.52 | ||||
N | y=8.433ln x+86.794 | 73 | 0.2180ns | 0.45 | 1.46 | |||||||
A | L | y=7.6476x+77.954 | 55 | 0.1175ns | ||||||||
N | y=3.1583ln x+84.415 | 55 | 0.0819ns | |||||||||
B | L | y=24.232x+64.174 | 18 | 0.5008* | 0.65 | 1.07 | 1.27 | 1.48 | ||||
N | y=25.841ln x+90.97 | 18 | 0.5773* | 0.65 | 0.96 | 1.17 | 1.42 | |||||
有机质 Organic matter (g·kg-1) | A+B | L | y=1.2736x+73.534 | 79 | 0.3089** | 5.1 | 12.9 | 16.9 | ||||
N | y=13.53ln x+55.867 | 79 | 0.3581** | 6.0 | 12.5 | |||||||
A | L | y=0.5911x+81.239 | 58 | 0.1378ns | 14.7 | |||||||
N | y=7.0091ln x+71.395 | 58 | 0.1836ns | 14.2 | ||||||||
B | L | y=2.1529x+61.524 | 21 | 0.5470* | 8.6 | 13.2 | 15.6 | |||||
N | y=21.999ln x+34.462 | 21 | 0.5948** | 5.0 | 7.9 | 12.5 | 15.7 |
养分 Nutrients | 生长年限 Growing years | 模型 Models | 丰缺级别Level | |||||
---|---|---|---|---|---|---|---|---|
6 | 5 | 4 | 3 | 2 | 1 | |||
碱解氮 Alkaline hydrolysis nitrogen (mg·kg-1) | A+B | L | < | 33~53 | 53~73 | ≥73 | ||
N | < | 33~53 | 48~70 | ≥70 | ||||
A | L | < | 30~52 | 52~ | ≥ | |||
N | < | 30~51 | 51~ | ≥ | ||||
B | L | < | 41~58 | 58~76 | ≥76 | |||
N | < | 27~37 | 37~51 | 51~69 | ≥69 | |||
全氮 Total nitrogen (g·kg-1) | A+B | L | <0.5 | 0.5~1.2 | 1.2~ | ≥ | ||
B | L | < | 0.7~1.1 | 1.1~1.5 | ≥1.5 | |||
N | < | 0.7~1.0 | 1.0~1.5 | ≥1.5 | ||||
有机质 Organic matter (g·kg-1) | A+B | L | <6 | 6~13 | 13~ | ≥ | ||
N | < | 6~13 | 13~ | ≥ | ||||
B | L | < | 9~14 | 14~ | ≥ | |||
N | < | 5~8 | 8~13 | 13~ | ≥ | |||
缺氮处理相对产量Relative yield without N treatment (%) | <60 | 60~70 | 70~80 | 80~90 | 90~100 | ≥100 |
Table 2 The rich-lack index of soil N for alfalfa in the Loess Plateau
养分 Nutrients | 生长年限 Growing years | 模型 Models | 丰缺级别Level | |||||
---|---|---|---|---|---|---|---|---|
6 | 5 | 4 | 3 | 2 | 1 | |||
碱解氮 Alkaline hydrolysis nitrogen (mg·kg-1) | A+B | L | < | 33~53 | 53~73 | ≥73 | ||
N | < | 33~53 | 48~70 | ≥70 | ||||
A | L | < | 30~52 | 52~ | ≥ | |||
N | < | 30~51 | 51~ | ≥ | ||||
B | L | < | 41~58 | 58~76 | ≥76 | |||
N | < | 27~37 | 37~51 | 51~69 | ≥69 | |||
全氮 Total nitrogen (g·kg-1) | A+B | L | <0.5 | 0.5~1.2 | 1.2~ | ≥ | ||
B | L | < | 0.7~1.1 | 1.1~1.5 | ≥1.5 | |||
N | < | 0.7~1.0 | 1.0~1.5 | ≥1.5 | ||||
有机质 Organic matter (g·kg-1) | A+B | L | <6 | 6~13 | 13~ | ≥ | ||
N | < | 6~13 | 13~ | ≥ | ||||
B | L | < | 9~14 | 14~ | ≥ | |||
N | < | 5~8 | 8~13 | 13~ | ≥ | |||
缺氮处理相对产量Relative yield without N treatment (%) | <60 | 60~70 | 70~80 | 80~90 | 90~100 | ≥100 |
目标产量 Target yield (t·hm-2) | 氮肥利用率 N fertilizer use efficiency (%) | 丰缺级别Level | |||||
---|---|---|---|---|---|---|---|
6 | 5 | 4 | 3 | 2 | 1 | ||
9.0 | 50 | 270 | 216 | 162 | 108 | 54 | 0 |
40 | 338 | 270 | 203 | 135 | 68 | 0 | |
30 | 451 | 359 | 270 | 181 | 89 | 0 | |
10.5 | 50 | 315 | 252 | 189 | 126 | 63 | 0 |
40 | 394 | 315 | 236 | 158 | 79 | 0 | |
30 | 526 | 419 | 315 | 211 | 104 | 0 | |
12.0 | 50 | 360 | 288 | 216 | 144 | 72 | 0 |
40 | 450 | 360 | 270 | 180 | 90 | 0 | |
30 | 601 | 479 | 360 | 241 | 119 | 0 | |
13.5 | 50 | 405 | 324 | 243 | 162 | 81 | 0 |
40 | 506 | 405 | 304 | 203 | 101 | 0 | |
30 | 676 | 539 | 405 | 271 | 134 | 0 | |
15.0 | 50 | 450 | 360 | 270 | 180 | 90 | 0 |
40 | 563 | 450 | 338 | 225 | 113 | 0 | |
30 | 752 | 599 | 450 | 302 | 149 | 0 | |
16.5 | 50 | 495 | 396 | 297 | 198 | 99 | 0 |
40 | 619 | 495 | 371 | 248 | 124 | 0 | |
30 | 827 | 658 | 495 | 332 | 163 | 0 | |
18.0 | 50 | 540 | 432 | 324 | 216 | 108 | 0 |
40 | 675 | 540 | 405 | 270 | 135 | 0 | |
30 | 902 | 718 | 540 | 362 | 178 | 0 | |
19.5 | 50 | 585 | 468 | 351 | 234 | 117 | 0 |
40 | 731 | 585 | 439 | 293 | 146 | 0 | |
30 | 977 | 778 | 585 | 392 | 193 | 0 | |
21.0 | 50 | 630 | 504 | 378 | 252 | 126 | 0 |
40 | 788 | 630 | 473 | 315 | 158 | 0 | |
30 | 1052 | 838 | 630 | 422 | 208 | 0 | |
22.5 | 50 | 675 | 540 | 405 | 270 | 135 | 0 |
40 | 844 | 675 | 506 | 338 | 169 | 0 | |
30 | 1127 | 898 | 675 | 452 | 223 | 0 |
Table 3 Recommended N application rates for alfalfa in the Loess Plateau (kg·hm-2)
目标产量 Target yield (t·hm-2) | 氮肥利用率 N fertilizer use efficiency (%) | 丰缺级别Level | |||||
---|---|---|---|---|---|---|---|
6 | 5 | 4 | 3 | 2 | 1 | ||
9.0 | 50 | 270 | 216 | 162 | 108 | 54 | 0 |
40 | 338 | 270 | 203 | 135 | 68 | 0 | |
30 | 451 | 359 | 270 | 181 | 89 | 0 | |
10.5 | 50 | 315 | 252 | 189 | 126 | 63 | 0 |
40 | 394 | 315 | 236 | 158 | 79 | 0 | |
30 | 526 | 419 | 315 | 211 | 104 | 0 | |
12.0 | 50 | 360 | 288 | 216 | 144 | 72 | 0 |
40 | 450 | 360 | 270 | 180 | 90 | 0 | |
30 | 601 | 479 | 360 | 241 | 119 | 0 | |
13.5 | 50 | 405 | 324 | 243 | 162 | 81 | 0 |
40 | 506 | 405 | 304 | 203 | 101 | 0 | |
30 | 676 | 539 | 405 | 271 | 134 | 0 | |
15.0 | 50 | 450 | 360 | 270 | 180 | 90 | 0 |
40 | 563 | 450 | 338 | 225 | 113 | 0 | |
30 | 752 | 599 | 450 | 302 | 149 | 0 | |
16.5 | 50 | 495 | 396 | 297 | 198 | 99 | 0 |
40 | 619 | 495 | 371 | 248 | 124 | 0 | |
30 | 827 | 658 | 495 | 332 | 163 | 0 | |
18.0 | 50 | 540 | 432 | 324 | 216 | 108 | 0 |
40 | 675 | 540 | 405 | 270 | 135 | 0 | |
30 | 902 | 718 | 540 | 362 | 178 | 0 | |
19.5 | 50 | 585 | 468 | 351 | 234 | 117 | 0 |
40 | 731 | 585 | 439 | 293 | 146 | 0 | |
30 | 977 | 778 | 585 | 392 | 193 | 0 | |
21.0 | 50 | 630 | 504 | 378 | 252 | 126 | 0 |
40 | 788 | 630 | 473 | 315 | 158 | 0 | |
30 | 1052 | 838 | 630 | 422 | 208 | 0 | |
22.5 | 50 | 675 | 540 | 405 | 270 | 135 | 0 |
40 | 844 | 675 | 506 | 338 | 169 | 0 | |
30 | 1127 | 898 | 675 | 452 | 223 | 0 |
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