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 […]

Young guava plants were grown in a nutrient solution in the presence of 0, 5, 10, 15, 20 and 25 mg L-1 aluminum, with pH being kept at 4.0. After 110 days, the plants were harvested and their content of macronutrients, Cu, Fe, Mn, Zn and Al were determined. Visual toxicity symptoms, developed under 20 and 25 mg L-1 aluminum, were as follows: reduction in height, absence of branching, decrease in diameter of stem dark roots and smaller leaves presenting […]