| Treatment |
Description of treatment in all the four different soils |
| Control |
Soil alone (3 kg soil, 0.45 g urea, 0.45 g Muriate of potash) |
| Soil + GRP |
3 kg soil mixed with GRP, 0.45 g urea, 0.45 g Muriate of potash |
| Soil + PARP |
3 kg soil mixed with PARP, 0.45 g urea, 0.45 g Muriate of potash |
| Soil + SSP |
3 kg soil, 0.9 g SSP, 0.45 g urea, 0.45 g Muriate of potash |