Volume 49, Number spe1, 2025

ABSTRACT Natural phosphate rocks (PR) are characterized by low phosphorus (P) solubility in water. Acidulation is the normal method to raise P solubility of these materials, however, it increases the cost and causes operational issues. The aim of this study was to evaluate the agronomic efficiency of partially acidulated and micro-granulated Arraias phosphate rock, which has a lower P content (6.88 %) than normal apatite concentrates. Two experiments were carried out in a greenhouse at the University of Rio Verde, […]

ABSTRACT Eucalyptus genus exhibits high nutrient use efficiency, but the phosphorus (P) balance in the soil under Eucalyptus stands is often negative, mainly due to higher P exportation in the wood after forest harvesting when compared with fertilization inputs. We evaluated the effect of phosphate fertilizers with varying solubilities and technologies on P balance and use efficiency in Eucalyptus, focusing on organic P (Po) mineralization. A randomized complete block design, with four blocks and six treatments, was used to test […]

ABSTRACT Phosphorus is essential for plant metabolism. Although banana plants do not absorb large quantities, most of this mineral is exported together with the fruits, where the nutrients are related to sensory, nutritional, and technological qualities. Highly weathered soils, such as those found in most of Brazil, can immobilize phosphorus because of the cationic charges in iron and aluminum ions, making the element unavailable to plants and more challenging for phosphate fertilization. Brazil is the fourth-largest banana producer worldwide and […]

ABSTRACT Phosphorus (P) is one of the most used nutrients in agriculture due to its high degree of interaction with the soil. It is susceptible to calcium precipitation in poorly weathered and alkaline soils, such as those in the Brazilian Semi-Arid region. Mehlich-1 is the most used extractor to evaluate P availability in this region. However, there are controversies regarding the efficiency of Mehlich-1 and the anion exchange resin (AER) has been an alternative extractor to evaluate P availability. However, […]

ABSTRACT Phosphorus (P) plays a crucial role in plant metabolism. However, its specific effect on biomass and stalk production in energy cane in tropical soil regions has not yet been fully clarified. This study aimed to evaluate the effect of P application rates on energy cane yield under two water regimes, determine critical soil P levels, and propose interpretive classifications for agronomic and fertilization recommendations. The experiment was conducted in containers in a controlled environment in a randomized block design […]

ABSTRACT Exploring different fertilization strategies in an integrated crop-livestock system (ICLS) can enhance soil phosphorus (P) availability and improve soil quality, ultimately leading to higher yield. This study aimed to evaluate different fertilization strategies in ICLS and their effects on soil P fractions, soil quality and soybean grain yield in a tropical soil. Initiated in 2019, the experiment tested four fertilization strategies: 1) Conventional fertilization with P and K applied at soybean sowing (CF); 2) CF + N fertilization in […]

ABSTRACT Although Brazilian soils contain considerable reserves of total P, accumulated by constant phosphorus (P) application, most of it is preserved in non-labile and moderately labile fractions, which could not be efficiently exploited so far. This study aimed to evaluate microorganisms capable of accessing less available P fractions in two soils with different textures. A greenhouse experiment in a completely randomized design, in a factorial arrangement (2 × 5) with four replications, was carried out in the municipality of Bandeirantes, […]

ABSTRACT Dynamics of phosphorus (P) distribution, availability, and accumulation in reservoirs are influenced by land use and management. This study aimed to evaluate the total P (TP) content in soil aggregates formed under different vegetation cover types and agricultural crops, analyze the inorganic and organic forms of P with different degrees of lability, evaluate the percentage of P adsorbed (P ads), and, investigate the interactions between the soil aggregate P-fractions evaluated and their physical and chemical properties. Three different cultivated […]