Phosphorus fractions in soils with distinct mineralogy and their relationship with phosphate buffer capacity indicators in Brazil

Lemos, Janyelle de Oliveira; Freire, Fernando José; Souza, Valdomiro Severino de; Oliveira, Emídio Cantídio Almeida de; Lucena, Pedro Gabriel Correia de; Silva, Suellen Roberta Vasconcelos da; Freire, Maria Betânia Galvão dos Santos; Lima, Danúbia Ramos Moreira de

doi:10.4025/actasciagron.v44i1.55148

Cited by 2 publications

(1 citation statement)

References 40 publications

(46 reference statements)

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“…The deficiency of P in the forage was clear, as plants cultivated without P application showed low P levels both in the plant cultivated in Oxisol (3.4 g kg −1 ) and in Entisol (7.8 g kg −1 ) in relation to the plant grown under the adequate P level in Oxisol (7.2 g kg −1) and Entisol (19.1 g kg −1 ). P deficiency in the plant was expected, as the soils used in this experiment presented low levels of available P. This is common in weathered soils, especially in Oxisol, which has a high phosphate adsorption capacity 66 , 67 .…”

Section: Discussionmentioning

confidence: 92%

Nanosilica modulates C:N:P stoichiometry attenuating phosphorus toxicity more than deficiency in Megathyrsus maximus cultivated in an Oxisol and Entisol

Melo

Amaral

Prado

et al. 2023

Sci Rep

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Silicon (Si) nanoparticles can attenuate nutritional disorders caused by phosphorus in forages through nutritional homeostasis. This paper aims to evaluate the effects of P deficiency and toxicity in Megathyrsus maximus cultivated in two types of soils and to verify whether Si application via fertigation can mitigate these imbalances. The following two experiments were carried out: cultivation of forage plants in pots with Entisol and Oxisol, in a 3 × 2 factorial design, with three nutritional levels of phosphorus (deficient, adequate, and excessive) and two Si concentrations in the irrigation water (0 and 1.5 mmol L−1). Height, number of tillers, rate of leaf senescence, dry matter production, C:N, C:Si, C:P, and N:P ratios; and C, P, and N use efficiencies were evaluated in two growth cycles. P imbalances hampered carbon assimilation, C:N:P homeostasis, and dry matter production. Nanosilica fertigation promoted silicon uptake, improving C:N:P homeostasis and nutritional efficiency in plants under P deficiency and toxicity. Leaf senescence was reduced with addition of Si in plants grown in Oxisol in the three nutritional states of P. Silicon attenuated the stress caused by P toxicity in Entisol and Oxisol, improving production in plants without nutritional stress in Oxisol. The supply of Si nanoparticles in the cultivation of M. maximus can contribute to a more efficient and sustainable use of phosphorus in pastures.

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Section: Discussionmentioning

confidence: 92%

Nanosilica modulates C:N:P stoichiometry attenuating phosphorus toxicity more than deficiency in Megathyrsus maximus cultivated in an Oxisol and Entisol

Melo

Amaral

Prado

et al. 2023

Sci Rep

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Integrated agroforestry system affects the dynamics of inorganic phosphorus fractions in the savanna of Brazilian Northeast

Silva,

Lacerda,

de Araújo-Neto

et al. 2024

Can. J. Soil. Sci.

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The savanna (Cerrado) of northeastern Brazil has undergone significant transition in land use to expand agricultural activities. In this region, soils are highly weathered, with phosphorus (P) commonly bound to aluminum (Al) and iron (Fe), creating conditions that demand the supply of P fertilizers to build soil fertility. Conservation systems, such as integrated agroforestry, can increase the inorganic P lability. The aim of this study was to evaluate soil P availability in components of an integrated agroforestry system. Four systems were studied from a 3-year experiment: eucalyptus ( E. urophylla × E. tereticornis) rows (ER), sabiá ( Mimosa caesalpiniifolia) rows (SR), inter-planted maize, and inter-planted soybean in addition to an area of native Cerrado (NC) used as a control. Inter-planted soybean and maize components showed an increase in available P in relation to NC, as a response to a liming-induced increase in soil pH and phosphate fertilization. Eucalyptus and sabiá row components showed an increase in available P in soil because of higher P recycling promoted by forest species and lower P adsorption onto Fe and Al due to the high concentrations of organic matter. Phosphorus forms, following a descending order for all components of the agroforestry system, are P–Al > P–Fe > P–Ca. This information can be used to improve management and soil quality of agricultural production in the Cerrado of the Brazilian northeast region.

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Phosphorus fractions in soils with distinct mineralogy and their relationship with phosphate buffer capacity indicators in Brazil

Cited by 2 publications

References 40 publications

Nanosilica modulates C:N:P stoichiometry attenuating phosphorus toxicity more than deficiency in Megathyrsus maximus cultivated in an Oxisol and Entisol

Nanosilica modulates C:N:P stoichiometry attenuating phosphorus toxicity more than deficiency in Megathyrsus maximus cultivated in an Oxisol and Entisol

Integrated agroforestry system affects the dynamics of inorganic phosphorus fractions in the savanna of Brazilian Northeast

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