Site and altitude in m | Response coefficients, Yield = a − bcr r = elemental nutrient rate
bBCbcr; r = elemental nutrient rate | Increase in yield due to incremental increase in elemental nutrient rate (kg/ha) | Recommended nutrient rate | |||||||
Nutrient | a | b | c | 0 - 5 | 5 - 10 | 10 - 15 | 15 - 20 | EOR† | Rec†† | |
t/ha |
| Yield increase, kg/ha | kg/ha | |||||||
Dedza (>1300) | P | 1.457 | 0.607 | 0.883 | 0.281 | 0.151 | 0.081 | 0.043 | 20 | 9 - 18 |
K | 0.837 | 0.019 | 0.908 | 0.007 | 0.004 | 0.003 | 0.002 | 0 | 0 | |
Lilongwe (760 - 1300) | P | 1.359 | 0.608 | 0.868 | 0.308 | 0.152 | 0.075 | 0.037 | 17 | 9 - 18 |
K | 1.402 | 0.508 | 0.781 | 0.360 | 0.105 | 0.030 | 0.009 | 16 | 0 | |
Salima (200 - 760) | P | 1.359 | 0.608 | 0.868 | 0.308 | 0.152 | 0.075 | 0.037 | 17 | 9 - 18 |
K | 1.402 | 0.508 | 0.781 | 0.360 | 0.105 | 0.030 | 0.009 | 16 | 0 |