Soybean Response to Seed Inoculation with Bradyrhizobium japonicum and/or Nitrogen Fertilization

Wacław Jarecki (), Ioana Maria Borza, Cristina Adriana Rosan, Simona Ioana Vicas and Cristian Gabriel Domuța
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Wacław Jarecki: Department of Crop Production, University of Rzeszów, Zelwerowicza 4, 35-601 Rzeszów, Poland
Ioana Maria Borza: Environmental Protection Faculty, University of Oradea, Gen. Magheru, no. 26, 410048 Oradea, Romania
Cristina Adriana Rosan: Environmental Protection Faculty, University of Oradea, Gen. Magheru, no. 26, 410048 Oradea, Romania
Simona Ioana Vicas: Environmental Protection Faculty, University of Oradea, Gen. Magheru, no. 26, 410048 Oradea, Romania
Cristian Gabriel Domuța: Environmental Protection Faculty, University of Oradea, Gen. Magheru, no. 26, 410048 Oradea, Romania

Agriculture, 2024, vol. 14, issue 7, 1-22

Abstract: Seed inoculation with symbiotic bacteria is a commonly employed practice in soybean cultivation. As a result, nodulation proceeds properly and plants self-supply atmospheric nitrogen, requiring either minimal or no additional nitrogen fertilization. The aim of the study was to investigate the response of soybeans to the application of the recommended or double dose of commercial inoculants (HiStick ® Soy or TURBOSOY ® ) and/or mineral nitrogen fertilization compared to the untreated control. It was demonstrated that a double dose of the tested preparations had the most favorable effect on nodulation. However, the impact of weather conditions modified their effectiveness during the study years, which was especially visible in 2022. Sowing seeds without inoculation (control) resulted in the formation of sparse root nodules and consequently the lowest leaf area index (LAI) and soil plant analysis development (SPAD) measurements. In addition, the values of SPAD and LAI indices varied across the years of the study, indicating that weather conditions modified nitrogen uptake by plants. Overall, seed inoculation and/or nitrogen fertilization positively influenced the chemical composition of seeds compared to the control. The only decrease observed was in the oil content, while the double dose of HiStick ® Soy preparation reduced the polyphenol content. The double dose of the tested inoculants had the most favorable impact on yield components and seed yield. However, applying inoculation at the recommended dose or in combination with nitrogen fertilization yielded similar or slightly worse results, depending on the year. Therefore, soybean seed inoculation should be recommended, although the effectiveness of the procedure will depend on various factors, including the type of inoculant, dosage, nitrogen fertilization, and weather conditions.

Keywords: Glycine max (L.) Merr.; inoculation; symbiotic bacteria; nitrogen; fertilization; plant nutritional status; crop; chemical composition of seeds (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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