Leaching potential and soybean responses to pre-sowing application of different sources of boron
DOI:
https://doi.org/10.5965/223811712442025767Keywords:
grain yield., perdas de boro, nutrição de boro, glicina máxima, micronutrientesAbstract
In southern Brazil, the high annual rainfall and soil pH conditions increase the potential for boron (B) leaching. This study aimed to examine B dynamics in soil and the responses of soybean (Glycine max (L.) Merr.) crops to surface application of B sources with different solubilities on two clay soils in southern Brazil. The following B sources were used: boric acid (17% B), ulexite (10% B), and disodium octaborate (21% B). Two experiments were conducted, one in soil columns and the other in the field. B leaching along soil columns under simulated edaphoclimatic conditions was not influenced by B source at the tested rate (1.1 kg ha−1 B). The three sources were effective in raising B content in the 0.00–0.20 m layer. On average, 60% of the added B remained in the soil following percolation with distilled water. In the field experiment, plots treated with ulexite or disodium octaborate at a rate of 1 kg ha−1 B had higher soybean yield than the untreated control. The results indicate that other factors besides solubility can influence the effectiveness of pre-sowing application of sources of B to improve soybean nutrition and yield.
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