Table 2: Toxicity changes caused by applying 1.5 g of CaCO3/1 kg of soil (potted test) (ppm).
|
Deep (cm) |
pH |
Fe2+ |
Fe3+ |
Al3+ |
SO4²- |
|||||
|
Have fertilized 3 tons CaCO3 |
Before |
After |
Before |
After |
Before |
After |
Before |
After |
Before |
After |
|
0-20 |
3.8 |
4.3 |
311 |
543 |
853 |
467 |
1.093 |
405 |
2.736 |
1.531 |
|
20-40 |
3.6 |
3.8 |
199 |
260 |
790 |
812 |
1.136 |
997 |
2.827 |
2.601 |
|
Do not fertilize CaCO3 |
|
|
|
|
|
|
|
|
|
|
|
0-20 |
3.9 |
3.9 |
311 |
752 |
849 |
484 |
1.095 |
879 |
2.736 |
2.700 |
|
20-40 |
3.6 |
3.6 |
195 |
514 |
790 |
562 |
1.130 |
1.000 |
2.856 |
2.800 |