Agronomic responses of soybean genotypes to starter nitrogen fertilizer rate
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The main nitrogen (N) sources in soybean production originate from soil ﬁxing bacteria Bradyrhizobium spp. and from mineralization of soil organic N. These sources of N are often not suﬃcient to cover the N needs of the soybean. The present two-year ﬁeld study aimed to evaluate the eﬀects of soybean genotypes (Valjevka and Galina) and rates of starter fertilizer N (0, 30, 60, and 90 kg ha−1) on quantitative and qualitative parameters and on rain use eﬃciency (RUE) under contrasting weather conditions in the Pannonian region of Serbia. A ﬁeld study conducted during two diﬀerent growing seasons: ﬁrst year with unfavorable weather conditions and second year with favorable weather conditions. As expected, the quantitative parameters, oil content, and RUE were higher in the year with favorable growing season, the second one. According to measured parameters, the genotype Valjevka performed higher yield potential as compared to the genotype Galina. The highest values of quantitative paramete...rs and RUE were recorded at 60 kg N ha−1, protein content at 90 kg N ha−1 and oil content 0 kg N ha−1 (control). This study suggests that proper genotype selection and application of 60 kg N ha−1 as a starter dose with rhizobial inoculation could contribute to the high yield, while protein could be altered by N amount, independently on genotype.
Keywords:soybean / nitrogen / starter fertilizer / yield / morphological parameters / yield components
Source:Agronomy, 2020, 10, 4, 1-10
Funding / projects:
- Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200022 (Institute for Animal Husbandry, Belgrade-Zemun) (RS-200022)