Efektywność agrotechniczna preparatów krzemowych jest determinowana przez biodostępność i stabilność formy chemicznej pierwiast­ka, a nie jego całkowitą zawartość w produkcie. Celem pracy była ocena zależności między formą strukturalną krzemu, a jego asymilacją przez rośliny, a także analiza porównawcza produktów dostępnych na polskim rynku rolniczym. W artykule scharakteryzowano właści­wości fizykochemiczne krzemianów, monomerycznego kwasu ortokrzemowego (H4SiO4) oraz nanokrzemionki (SiO2), różnicując je pod kątem mobilności w środowisku glebowym oraz mechanizmów transportu i odkładania w tkankach roślinnych. Przeprowadzona analiza rynku ujawniła brak jednolitych standardów w deklarowaniu składu chemicznego. Istotnym problemem ograniczającym bezpośrednią porównywalność produktów jest równoległe stosowanie jednostek przeliczeniowych pierwiastka (Si i SiO2) oraz niejednolity sposób in­formowania o rzeczywistej formie aktywnej krzemu. Uzyskane wyniki wskazują na potrzebę wypracowania spójnych standardów rapor­towania składu i metod oceny jakościowej, co pozwoli na bardziej przewidywalne i racjonalne wykorzystanie preparatów krzemowychw praktyce rolniczej.

The agricultural effectiveness of silicon formulations is determined by the bioavailability and stability of the element’s chemical form rather than its total content in the product. The aim of this study was to evaluate the relationship between the structural form of silicon and its assimilation by plants, alongside a comparative analysis of products available on the Polish agricultural market. The article cha­racterizes the physicochemical properties of silicates, monomeric orthosilicic acid (H4SiO4), and nanosilica (SiO2), differentiating them in terms of mobility in the soil environment as well as transport and deposition mechanisms in plant tissues. The market analysis revealed a high degree of a lack of uniform standards for declaring chemical composition. A significant issue limiting the direct comparability of products is the parallel use of conversion units for the element (Si and SiO2) and inconsistent reporting on the actual active form of sili­con. The results indicate a need to develop consistent standards for composition reporting and qualitative assessment methods, which will allow for more predictable and rational use of silicon products in agricultural practice.

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