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In the era of observed climatic changes that contribute to the emergence of soil moisture deficiency, effective ways to retain and rationally manage water are being sought. One of the ways to make water available during periods without rain is the use of a superabsorbent. The aim of the study was to identify the response of two soybean cultivars ( Glycine max  (L.) Merrill) to different doses of a superabsorbent polymer (SAP). The effect of the SAP on seed yields, selected elements of the yield structure and the chemical composition of seeds were evaluated. The study was carried out during 2016–2018, based on a two-factor field experiment, in a split-plot design, where the dose of SAP (0, 20, 30 kgha −1 ) and legume cultivar (Aldana, Merlin) were the factors. The results of the research showed that SAP application significantly increased the yield of soybean, but did not affect the quantitative traits and chemical composition of seeds. Genetic factors differentiated the seed yields and chemical composition of the soybeans. A significantly higher yield was obtained for the Merlin cultivar compared to Aldana (by 31.0% on average). The Merlin cultivar accumulated more total protein in seeds, but contained significantly less crude ash and potassium compared to Aldana.

The effect of a superabsorbent as a soil amendment on seed yield and chemical composition of two soybean genotypes