Table 3 The N-P-K balance for the arable crops disaggregated in cereals plus potato, legume crops and fallow land.
N-P-K flows (Mg) | Cereals and potato | Legume crops | Fallow land | ||||||
|---|---|---|---|---|---|---|---|---|---|
N | P | K | N | P | K | N | P | K | |
Outputs | |||||||||
Harvests (Ho) | 29 343 | 5 134 | 104 | 4 838 | 549 | 49 | 0 | 0 | 0 |
Cropped or grazed straw (So) | 13 811 | 2 770 | 13 559 | 1 826 | 219 | 1 886 | 0 | 0 | 0 |
Cropped or grazed weeds – crops (Wo) | 19 768 | 1 872 | 13 313 | 4 275 | 405 | 2 879 | 0 | 0 | 0 |
Cropped or grazed weeds – fallow (Go) | 0 | 0 | 0 | 0 | 0 | 0 | 33 613 | 3 308 | 23 519 |
Leaching and runoff (Lo) | 11 888 | 0 | 4 701 | 722 | 0 | 1 019 | 3 236 | 0 | 3 654 |
Erosion (Eo) | 0 | 2 832 | 3 193 | 0 | 118 | 692 | 0 | 266 | 3 309 |
N emissions (Vo) | 22 009 | 0 | 0 | 4 768 | 0 | 0 | 12 642 | 0 | 0 |
Sum | 96 819 | 12 609 | 34 870 | 16 429 | 1 291 | 6 524 | 49 491 | 3 574 | 30 483 |
Inputs | |||||||||
Seeds (Si) | 2 838 | 497 | 732 | 663 | 76 | 165 | 0 | 0 | 0 |
Manure (Mi) | 12 837 | 2 499 | 6 303 | 1 426 | 278 | 700 | 0 | 0 | 0 |
Field excretions (Ei) | 8 865 | 1 458 | 4 508 | 1 921 | 316 | 977 | 16 179 | 2 660 | 8 228 |
Other biomass entries (Bi) | 2 185 | 348 | 2 916 | 2 185 | 348 | 2 916 | 0 | 0 | 0 |
Chemical fertilizers (Fi) | 33 747 | 24 367 | 4 164 | 265 | 583 | 128 | 0 | 0 | 0 |
Rainfall (Ri) | 9 449 | 470 | 3 808 | 2 047 | 102 | 825 | 9 793 | 487 | 3 947 |
Irrigation (Ii) | 4 070 | 111 | 6 976 | 257 | 7 | 441 | 0 | 0 | 0 |
Soil weathering (Wi) | 0 | 2 351 | 17 426 | 0 | 509 | 3 775 | 0 | 2 436 | 18 060 |
Symbiotic N fixation - cultivated legumes (Li) | 0 | 0 | 0 | 8 131 | 0 | 0 | 0 | 0 | 0 |
Symbiotic N fixation - wild legumes (LWi) | 6 326 | 0 | 0 | 1 368 | 0 | 0 | 15 646 | 0 | 0 |
Non-symbiotic N fixation (Oi) | 4 701 | 0 | 0 | 1 019 | 0 | 0 | 8 262 | 0 | 0 |
Sum | 85 019 | 32 100 | 47 101 | 19 283 | 2 218 | 9 985 | 49 880 | 5 584 | 30 724 |
Balance | |||||||||
(Mg) | −11 801 | 19 491 | 12 231 | 2 854 | 928 | 3 461 | 388 | 2 010 | 241 |
(kg.ha−1.yr−1) | −5, 0 | 8, 3 | 5, 2 | 5, 6 | 1, 8 | 6, 8 | 0, 2 | 0, 8 | 0, 1 |
