Research Article
Effects of Complex Fertilizers on the Properties of Grey Forest Heavy Loamy Soil
Table 3
Influence of fertilizers on the content of humic acids (%).
| Fertilizer | Content of humic acids (%) |
| RK + Fon (control) | 11.5 | RK + NH4NO3 | 15.6 | RK + (NH2)2CO | 18.2 | RK + KAS-32 | 25.4 | RK + DAFK | 22.4 | RK + “Akvaren 3” | 23.2 |
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