Effect of Soil Buffer Capacity on Soil Test Phosphorus Interpretation and Fertilizer Requirement

Quintero, César; Boschetti, N. G.; Benavídez, R. A.

doi:10.1081/css-120020455

Cited by 15 publications

(9 citation statements)

References 11 publications

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“…Soils with similar STP Bray‐1 levels but different soil texture, could differ in their P diffusion rate and P supply (Quintero, Boschetti, & Benavidez, 2003; Silberbush & Barber, 1983). In addition, soils with a higher relative decrease rate of STP Bray‐1 showed low annual P removal.…”

Section: Discussionmentioning

confidence: 99%

Predicting soil test phosphorus decrease in non‐P‐fertilized conditions

Appelhans

Carciochi

Correndo

et al. 2020

European J Soil Science

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Monitoring the availability of phosphorus (P) in soil under continuous cropping facilitates finding deficiency in crops and contributes to improving crop growth and nutrient management models. Soil P availability for crops is usually estimated by soil test P (STP), such as Bray‐1. This is widely used in the Americas. The relationship between the decrease of STP Bray‐1 and cumulative removal of P was evaluated in non‐P‐fertilized areas in long‐term studies. This removal was the sum of annual P removal over the study period as P exported in grains/crop outside the soil. The objectives were to: (a) quantify changes in STP as a function of cumulative P removal, (b) assess the relationship between relative decrease rate of STP and soil variables as well as annual removal of P by crops, and (c) develop a model to predict decrease of STP Bray‐1. Exponential decay functions were used to describe annual cumulative removal of P and STP from soil over time for 12 long‐term studies where no addition of P fertilizer was carried out. Changes in the relative rate of decrease of STP, relative to the initial STP Bray‐1 value at the onset of the experiment, were predicted by the ratio of soil organic matter to clay and silt and the average annual P removal by exponential decay (R2adj = 0.64; RMSE = 3.2 mg kg−1). We propose this predictive model as suitable to provide estimates of the relative decrease rate of STP by Bray‐1 and thereby improve management of P for optimizing crop yield. Highlights STP Bray‐1 decrease and cumulative P removal were related by exponential decay functions. Relative decrease rate of STP Bray‐1 was related to SOM/(clay+silt) ratio and annual P removal. A predictive model of the relative decrease rate of STP Bray‐1 was fitted and validate. Our model is a useful tool to help predict soil P availability and nutrient management.

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Section: Discussionmentioning

confidence: 99%

Predicting soil test phosphorus decrease in non‐P‐fertilized conditions

Appelhans

Carciochi

Correndo

et al. 2020

European J Soil Science

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“…These results are similar to those identified by Silver et al (2000) [75] who found that when soil clay content increased, labile P decreased while total P increased, due to P being easily complexed with exchangeable Al and Fe. Our soil P analyses (weak Bray) were designed to assess the labile P pools [145] , [146] , which would have the greatest effect on foliar P concentrations. Therefore, in this study, our results indicate that soil P represents variation in soil clay content resulting from differences in our chronosequence not related to successional processes, which was then mirrored in the foliar P content.…”

Section: Discussionmentioning

confidence: 99%

Integrating Stand and Soil Properties to Understand Foliar Nutrient Dynamics during Forest Succession Following Slash-and-Burn Agriculture in the Bolivian Amazon

Broadbent¹,

Zambrano²,

Asner³

et al. 2014

PLoS ONE

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Secondary forests cover large areas of the tropics and play an important role in the global carbon cycle. During secondary forest succession, simultaneous changes occur among stand structural attributes, soil properties, and species composition. Most studies classify tree species into categories based on their regeneration requirements. We use a high-resolution secondary forest chronosequence to assign trees to a continuous gradient in species successional status assigned according to their distribution across the chronosequence. Species successional status, not stand age or differences in stand structure or soil properties, was found to be the best predictor of leaf trait variation. Foliar δ13C had a significant positive relationship with species successional status, indicating changes in foliar physiology related to growth and competitive strategy, but was not correlated with stand age, whereas soil δ13C dynamics were largely constrained by plant species composition. Foliar δ15N had a significant negative correlation with both stand age and species successional status, – most likely resulting from a large initial biomass-burning enrichment in soil 15N and 13C and not closure of the nitrogen cycle. Foliar %C was neither correlated with stand age nor species successional status but was found to display significant phylogenetic signal. Results from this study are relevant to understanding the dynamics of tree species growth and competition during forest succession and highlight possibilities of, and potentially confounding signals affecting, the utility of leaf traits to understand community and species dynamics during secondary forest succession.

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“…The Vertisol has greater clay content and P adsorption capacity (Quintero et al, 2003), so more P is needed to increase Pt-Bic compared with the Mollisol. In addition, the Vertisol site had a less productive and intensive crop sequence (Novelli et al, 2017).…”

Section: Crops P Nutritionmentioning

confidence: 99%

Assessing soil P fractions changes with long‐term phosphorus fertilization related to crop yield of soybean and maize

Appelhans

Barbagelata

Melchiori³

et al. 2020

Soil Use and Management

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Long-term P fertilization increases soil phosphorus (P) labile fractions, which can be associated with crop P uptake and grain yield and are useful to improve fertilizer recommendations. Research aims were to evaluate in long-term experiments with different P fertilization in a Mollisol and a Vertisol: i) the changes of soil P fractions, and ii) the relationship between soil P fractions with long-term P fertilization, accumulated apparent P budget, grain P, total P uptake, soybean (Glycine max L.Merr.) and maize (Zea mays L.) grain yield. Soil P fractions were measured after 1 and 9 yr since the beginning of long-term experiments. Experiments included an initial fertilization rate of 200 kg P ha -1 , and annual P fertilization rate of 36 kg P ha -1 . Bray1-P, total, organic, and inorganic P in fine (<53µm) and coarse (>53µm) (CF) soil fractions, and in NaHCO 3 extract were measured.Initial P fertilization increased inorganic and total P fractions. Whereas, Bray1-P, total P in NaHCO 3 extract and in the CF were the fractions with most increased with continuous long-term P fertilization in both sites. In the Mollisol, maize grain yield was unrelated to long-term P fertilization. In the Vertisol, total P in NaHCO 3 extract, and total and organic P in the CF were more closely related to soybean grain yield than Bray1-P. We proposed soil P indices of labile inorganic and organic P that showed close relationships with soybean grain yield and may be useful to improve the diagnosis of P soil fertility.

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Effect of Soil Buffer Capacity on Soil Test Phosphorus Interpretation and Fertilizer Requirement

Cited by 15 publications

References 11 publications

Predicting soil test phosphorus decrease in non‐P‐fertilized conditions

Predicting soil test phosphorus decrease in non‐P‐fertilized conditions

Integrating Stand and Soil Properties to Understand Foliar Nutrient Dynamics during Forest Succession Following Slash-and-Burn Agriculture in the Bolivian Amazon

Assessing soil P fractions changes with long‐term phosphorus fertilization related to crop yield of soybean and maize

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