Identifying environmental phosphorus risk classes at the scale of Prince Edward Island, Canada

Benjannet, Rim; Khiari, Lotfi; Nyiraneza, Judith; Thompson, B.; He, Juanxia; Geng, Xiaoyuan; Stiles, Kyra; Jiang, Yefang; Fillmore, Sherry

doi:10.1139/cjss-2017-0076

Cited by 18 publications

(34 citation statements)

References 99 publications

(53 reference statements)

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“…Our results show that the Mehlich-3 method, which is widely used in acidic to near-neutral soils in North America including Canada, can be used on the soils of coastal BC. Use of the Mehlich-3 method offers the opportunity to assess other cations such as Al and Fe and therefore make it possible to adapt a PSI for BC soils (Khiari et al, 2000;Sims et al, 2002;Benjannet et al, 2018). We showed that P M3 , DPS and PSI were all closely related to silage corn DMY and P uptake across 11 soils with a wide range of soil test P levels.…”

Section: Agronomic and Environmental Implications For Soils With Highmentioning

confidence: 79%

“…In Wallonia, Belgium, a study using 57 agricultural topsoil samples subject to diverse P management showed that DPS values between 20 and 30% corresponded to the agronomic optimum of soil P content (Renneson et al, 2015). In North America, the PSI has provided much-needed information to support environmental assessment at watershed, local, and provincial scales (Khiari et al, 2000;Sims et al, 2002;Benjannet et al, 2018).…”

Section: Relationship Between Silage Corn Yield and P Saturation Indimentioning

confidence: 99%

“…The P saturation index (PSI) as adaptation of the degree of P saturation (DPS) using routine agronomic soil test was developed in several agricultural regions of Canada and the United States. A PSI was adapted for the acidic soils of eastern Canada (Khiari et al, 2000;Pellerin et al, 2006;Benjannet et al, 2018) and the mid-Atlantic regions of the US (Sims et al, 2002) using P and Aluminum (Al) extracted by the Mehlich-3 method because P retention is correlated with Al in these soils. Benjannet et al (2018) identified two critical values of PSI for Atlantic Canada above which P fertilization should be limited to crop requirements: 19.2% for very to extremely acidic soils (pH < 5.5) and 14.2% for slightly to moderately acidic soils (pH > 5.5).…”

Section: Introductionmentioning

confidence: 99%

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Combined Starter Phosphorus and Manure Applications on Silage Corn Yield and Phosphorus Uptake in Southern BC

Messiga

Lam

et al. 2020

Front. Earth Sci.

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Phosphorus (P) management using mineral and manure P in excess of plant needs contributes to legacy soil P in coastal British Columbia, Canada. The objectives of this study were (a) to assess the effects of starter P at early growth stages and their carryover through corn maturity, and (b) to determine how corn yields relate to soil P saturation indicators. Eleven 1-year experiments were conducted on sites with contrasting legacy soil P in 2018 (three sites) and 2019 (eight sites). Six combinations of starter and manure P rates (T1: 0P starter + 0P manure ; T2: 0P starter + 35P manure ; T3: 5P starter + 30P manure ; T4: 10P starter + 25P manure ; T5: 15P starter + 20P manure ; T6: 20P starter + 15P manure) were assigned to a RCBD with four replicates. In 2018, corn dry matter weight (DMY) at the 6-leaf stage was affected by starter P in all sites, and the response curve was described by a linear-plus-plateau model with critical starter P of 5.0 and 7.5 kg ha −1. In 2019, corn DMY at early growth stages was not affected by starter P. Corn DMY at harvest varied between 15.2 Mg ha −1 in sites with low initial soil P and 27.2 Mg ha −1 in sites with excess P. Four sites exhibited a trend of high DMY with treatment comprising low starter P and high side-dressed manure P additions. The degree of P saturation (DPS, 14.0 to 38.0%) and P saturation index (PSI, 3.0 to 14.0%) were related to corn DMY by quadratic functions (R 2 = 0.76-0.94). From these results, we can conclude that the effect of starter P on young corn plants varies with year, but does not carryover through harvest. Moreover, current starter P (30-40 kg ha −1) recommended for corn can be reduced by up to 75% (5.0-7.5 kg ha −1) without affecting yield, thus reducing annual P inputs and farmers' production costs. Finally, PSI as a proxy of DPS is a possible agro-environmental indicator that, coupled with reduced starter P fertilizer, can further contribute to reducing the risk of P transfer from agricultural soils in coastal British Columbia.

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Section: Agronomic and Environmental Implications For Soils With Highmentioning

confidence: 79%

Section: Relationship Between Silage Corn Yield and P Saturation Indimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Combined Starter Phosphorus and Manure Applications on Silage Corn Yield and Phosphorus Uptake in Southern BC

Messiga

Lam

et al. 2020

Front. Earth Sci.

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“…In North America, including Canada, the oxalate soil extraction method used to assess DPS is not a routine analysis (Dayton et al 2014). Instead, the P saturation index (PSI) derived from Mehlich-3 P (P M3 ) and aluminum (Al M3 ) and (or) iron (Fe M3 ) is used as a proxy of DPS to assess the risk for P leaching from agricultural soils (Sims et al 2002;Pellerin et al 2006;Wang et al 2012;Benjannet et al 2018). Advantages of the Mehlich-3 extraction method include the capability to make fertilizer recommendations for P as well as other macroand micronutrients such as calcium, magnesium, and zinc to achieve optimum yields (Penn et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…To our knowledge, there is limited information on how PSI is related to DPS or water-extractable P (Pw), two main indicators of the risk of P to the environment, across agricultural soils and cropping systems in south coastal BC. The PSI is influenced by soil pH (Benjannet et al 2018) and soil texture (Pellerin et al 2006). Penn et al (2018) showed that the P extracted by the Mehlich-3 method decreases with increasing soil pH because of changing P forms, partial neutralization of extractant pH, and consumption of extractant fluoride.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus saturation index and water-extractable phosphorus in high-legacy phosphorus soils in southern British Columbia, Canada

Messiga

Lam

2021

Can. J. Soil. Sci.

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Understanding of the risk of phosphorus (P) loss to the environment is crucial to monitor soil P and implement policies for P management. We assessed P sorption characteristics and adapted a P saturation index (PSI) for silage corn and blueberry fields in south coastal British Columbia (BC), Canada. We used 284 composite soil samples with contrasting P levels collected from eight silage corn and 23 blueberry fields across south coastal BC. The P sorption maximum (Smax) varied between 982 and 2532 mg P·kg−1 and was influenced by aluminum concentration and organic matter content. The degree of P saturation was related to water-extractable P (Pw) by a quadratic regression with R2 = 0.85. A critical Pw = 3.7 mg·kg−1 was established across the two cropping systems. The silage corn fields with pH > 5.5 had critical PSI value of 10.4%, and blueberry fields with pH < 4.7 had critical PSI value of 18.0%. These results showed that the risk of P loss from soil in the silage corn was high, but it was low for blueberry because the critical PSI for silage corn fields was lower than for blueberry fields, and therefore, saturation would be more easily reached, even though more P is applied to blueberry fields. The combination of a critical PSI and Pw as agri-environmental indicators will help farmers and professionals to identify fields with risk of P loss, to implement a nutrient management plan, and to monitor how this risk changes with time.

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Potato response to struvite compared with conventional phosphorus fertilizer in Eastern Canada

et al. 2020

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In acidic soils with high phosphorus (P) fixing capacity, P application at levels higher than crop requirements is common in crops with high P demands such as potato (Solanum tuberosum L.), which could lead to eutrophication. Recycled sources of P fertilizer, such as struvite, can be efficient in meeting crop P demands while minimizing P losses. The objective of this study-conducted in four provinces over 3 yr (2016-2018, with 12 sites in total) in Eastern Canada-was to assess potato response to P fertilizer as triple superphosphate (TSP) or a mixture of TSP with struvite. Eight P treatments were applied with five increasing P rates as TSP (0, 26, 52, 79, and 105 kg P ha −1 ) and three treatments as a mixture of TSP and struvite (25, 50, and 75% (w/w) struvite) at a rate of 79 kg P ha −1 . Phosphorus availability indices measured multiple times over the growing season were composed of Mehlich-3 extracted P (P M3 ), soil P adsorbed on anion exchange membranes (P AEMs ), and petiole P-PO 4 (P petiole ) concentrations. There was a potato yield response to P inputs at all sites, with the control treatment showing lower potato yield at all sites. Potato yield, P petiole , P M3 , and P AEMs were comparable between 100% TSP and TSP+struvite at the same rate, except at one site where struvite at a higher proportion depressed yield and was associated with lower P uptake. Overall, the use of struvite could be a sustainable mean to address long-term globally P scarcity.

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Identifying environmental phosphorus risk classes at the scale of Prince Edward Island, Canada

Cited by 18 publications

References 99 publications

Combined Starter Phosphorus and Manure Applications on Silage Corn Yield and Phosphorus Uptake in Southern BC

Combined Starter Phosphorus and Manure Applications on Silage Corn Yield and Phosphorus Uptake in Southern BC

Phosphorus saturation index and water-extractable phosphorus in high-legacy phosphorus soils in southern British Columbia, Canada

Potato response to struvite compared with conventional phosphorus fertilizer in Eastern Canada

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