Published in Scientific Papers. Series A. Agronomy, Vol. LXVII, Issue 1
Written by Nataliia PALAMAR, Oleksandr KAZIUTA
The special role of iron compounds in the formation of the fertility of alluvial Fluvisols is an actual direction of research. The purpose of the work is to establish the laws of transformation, migration and accumulation of iron in floodplain soils, taking into account the peculiarities of the conditions of their formation and the influence of these processes on their fertility. These processes have an important genetic-diagnostic and agro-ecological role. The regularities of the content and profile distribution of non-silicate forms of iron in floodplain soils of the Left Bank Forest-Steppe of Ukraine with different degrees of hydromorphism are indicated in the article. Iron significantly affects the content of nutrients in plants, in particular, the content of phosphorus and potassium. Fixing them in a form inaccessible to plants can cause a deficiency in mineral nutrition of plants. The transformation of organic matter occurs with an increase in the content of the fulvic acid group under conditions of waterlogging. There is a sharp increase in the solubility of iron hydroxide at the same time. Collectively, all this leads to the migration of iron compounds along the soil profile and the formation under certain conditions of concretionary forms of iron that can impair soil fertility. The introduction of different doses of iron did not significantly affect the acid-alkaline balance of the soil solution. The pH remained within the neutral range.
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