Degree of phosphorus saturation threshold for minimizing P losses by runoff in cropland soils of Southern Brazil

Bortolon, Leandro; Ernani, Paulo Roberto; Bortolon, E. S. O.; Gianello, Clésio; Almeida, Rodrigo Gabriel Oliveira de; Welter, Samuel; Rogeri, Douglas Antônio

doi:10.1590/s0100-204x2016000900008

Cited by 18 publications

(10 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The WSP ranged from 0 to 0.31 mg L −1 and had strong and significant correlations with PSR ( r = .66, P < .001) and SPSC (r = −.67, P < .001), similar to observations in other studies (Bortolon et al., 2016; Chakraborty, Nair, Harris, & Rhue, 2012; Nair et al., 2004; Wang, Zhang, O'Halloran, Tan, & Hu, 2016). Relationship thresholds were observed when the PSC‐based indices were plotted against WSP values.…”

Section: Resultssupporting

confidence: 89%

See 1 more Smart Citation

Development of phosphorus sorption capacity‐based environmental indices for tile‐drained systems

et al. 2020

View full text Add to dashboard Cite

The persistent environmental relevance of phosphorus (P) and P sorption capacity (PSC) on P loss to surface waters has led to proposals for its inclusion in soil fertility and environmental management programs. As fertility and environmental management decisions are made on a routine basis, the use of laborious P sorption isotherms to quantify PSC is not feasible. Alternatively, pedotransfer functions (pedoTFs) estimate PSC from routinely assessed soil chemical properties. Our objective was to examine the possibility of developing a suitable pedoTF for estimating PSC and to evaluate subsequent PSC‐based indices (P saturation ratio [PSR] and soil P storage capacity [SPSC]) using data from an in‐field laboratory where tile drain effluent is monitored daily. Phosphorus sorption capacity was well predicted by a pedoTF derived from soil aluminum and organic matter (R² = .60). Segmented‐line relationships between PSR and soluble P were observed in both desorption assays (R² = .69) and drainflows (R² = .66) with apparent PSR thresholds in close agreement at 0.21 and 0.24, respectively. Negative SPSC values exhibited linear relationships with increasing soluble P concentrations in both desorption assays and drainflows (R² = .52 and R2 = .53 respectively), whereas positive SPSC values were associated with low SP concentrations. Therefore, PSC‐based indices determined using pedoTFs could estimate the potential for subsurface soluble P losses. Also, we determined that both index thresholds coincided with the critical soil‐test P level for agronomic P sufficiency (22 mg kg−1 Mehlich‐3 P) suggesting that the agronomic threshold could serve as an environmental P threshold.

show abstract

Section: Resultssupporting

confidence: 89%

“…; distilled water may be used as the extracting solution. Bortolon et al, 2016;Davis et al, 2005;Sharpley, McDowell, Weld, & Kleinman, 2001 Phosphorus sorption capacity (PSC) Soil P fixation potential or total quantity of sorbed P in a P saturated soil.…”

Section: Introductionmentioning

confidence: 99%

Development of phosphorus sorption capacity‐based environmental indices for tile‐drained systems

et al. 2020

View full text Add to dashboard Cite

show abstract

“…However, independently of fertilizer, available P content increased as a function of P dose in all assessed layers ( Table 2). Although the soil P levels obtained in all treatments were very high according to the ranges proposed by Silva et al (2016), P availability in oxidic soils is strictly controlled by the mineral phase, when this nutrient is strongly adsorbed, and by the large number of adsorbent sites present in the entire profile of this soil type (Shuai & Zinati, 2009;Bortolon et al, 2016;Fink et al, 2016), which allows controlling P fixation and release from fertilizers even when soil P content is high.…”

Section: Fertilizermentioning

confidence: 61%

Phosphate fertilization with organomineral fertilizer on corn crops on a Rhodic Khandiudox with a high phosphorus contente

Grohskopf

Corrêa

Fernandes

et al. 2019

Pesq. agropec. bras.

View full text Add to dashboard Cite

The objective of this work was to evaluate the nutritional content and grain yield of three corn (Zea mays) crops in response to phosphate fertilization with an organomineral fertilizer based on poultry litter or a mineral fertilizer, when cultivated on a Rhodic Khandiudox with a high initial phosphorus content. The experiment was carried out in the field in a randomized complete block design in a 2×4+1 factorial arrangement (organomineral or mineral fertilizer × 20, 40, 60, or 80 kg ha-1 P + control treatment with no phosphate fertilization), with four replicates each. Available P and total organic carbon (TOC) contents in the soil at the end of the crop cycle, plant tissue P contents, and grain yield were determined. The agronomic efficiency index (AEI) was estimated based on corn grain yield. After three harvests, soil available P and TOC contents did not increase significantly due to fertilizer use, but were directly related to P doses. In a Rhodic Khandiudox with a high initial P content, the use of an organomineral fertilizer based on poultry litter promotes higher corn crop yield, with an AEI 20% higher than that of the mineral fertilizer.

show abstract

“…In the case of the Ultisols and the Entisols, DPS reached 31% in Typic Udorthent (Table 2). In another study to assess the risk of P losses using DPS, Bortolon et al (2016) evaluated eight of the most representative cropland soil types in southern Brazil and found DPS values ranging from 4.6 to 79.9%, with an average of 28%.…”

Section: Resultsmentioning

confidence: 99%

Degree of phosphate saturation in highly weathered tropical soils

Campos

Antonângelo

Zee

et al. 2018

Agricultural Water Management

View full text Add to dashboard Cite

The degree of phosphate saturation (DPS) is an indicator for P-saturation, which is of assistance to the prediction of P losses and potential eutrophication of surface water. The scaling factor (α) estimates the adsorption capacity of the soil and is used to calculate the DPS. In soils from temperate regions, the value of α = 0.5 is widely used. However, using just a single value for α may fail to estimate the adsorption capacity correctly for all soils. In this study, the aims were (i) to calculate the scaling factor α and the DPS of highly weathered tropical soils with different chemical, physical and mineralogical properties in order to predict P losses; and (ii) to identify which soil properties are related to P adsorption. The scaling factor α and the DPS were calculated at 1, 3, 7, 21, 42 and 84 days (d), the highest one in recognition of the long-term kinetics of sorption. The values of α increased as the contact period increased. Lower DPS values were obtained in soils with high P adsorption capacity whereas the highest DPS values were obtained in soils with a lower adsorption capacity. Out of ten Oxisols studied, six of them had an α higher than 1. Contents of clay, organic carbon (C) and poorly crystalline (Al ox) and crystalline ("free") Al oxides were the properties that best correlated with P adsorption. For the Oxisols, the clay content, poorly crystalline together with crystalline Fe and Al oxides represented the main components related to P adsorption. The highest DPS (31%) was found in Typic Udorthent. The content of poorly crystalline oxides was not suitable for the scaling factor α for most Oxisols, and only the Typic Udorthent exceeded the critical threshold of 23%, and is thus more susceptible to loss of P.

show abstract

Degree of phosphorus saturation threshold for minimizing P losses by runoff in cropland soils of Southern Brazil

Cited by 18 publications

References 33 publications

Development of phosphorus sorption capacity‐based environmental indices for tile‐drained systems

Development of phosphorus sorption capacity‐based environmental indices for tile‐drained systems

Phosphate fertilization with organomineral fertilizer on corn crops on a Rhodic Khandiudox with a high phosphorus contente

Degree of phosphate saturation in highly weathered tropical soils

Contact Info

Product

Resources

About