Abstract
A good soil fertility management for soybean production must consider the amount of nutrients that are exported by seeds. In recent decades, soybean yield has increased due to better crop management and genetic improvements, which may affect the amount of nutrients removed. Therefore, this study aimed (i) to analyze the relationship between the concentration of macronutrients in soybean seeds in Brazil with soybean yield and genotypes, and (ii) to update nutrient concentration values in soybean seeds for fertilizer recommendation [...]
Highlights
Brazil is the largest soybean producing country worldwide, accounting for 37 % (120 million megagrams) of the global soybean production in 2019/2020 cropping season (USDA, 2020)
Concentration of macronutrients in soybean seed is affected by both soybean yield and genetic material
Modern genotypes of the Intacta Roundup Ready-2 group remove 15, 21, 18, 17, and 23 % more K, P, Ca, Mg, and S and 4 % less N compared to non-Roundup Ready genotypes
Summary
Brazil is the largest soybean producing country worldwide, accounting for 37 % (120 million megagrams) of the global soybean production in 2019/2020 cropping season (USDA, 2020). In the last 15 years, soybean seed yield in Brazil has increased by 20 % (Conab, 2017), reaching an average of 3.3 Mg ha-1 in the last cropping season (2019/2020). Soybean requires extracting approximately 170 kg of macronutrients to produce one megagram of seeds, but the removal by the grains is approximately half of that (Lantmann and Castro, 2004; Bender et al, 2015). These nutrients are taken up essentially from the soil (except nitrogen that can be derived from the air), requiring a replenishment to prevent soil nutrient depletion and ensure high soybean yields in the following harvests. Reliable reference values for nutrient concentration in soybean seeds are essential to increase the accuracy of fertilization recommendation systems
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