Urochloa ruziziensis cover crop increases the cycling of soil inositol phosphates

Almeida, Danilo Silva; Turner, Benjamín L.; Wearing, Catherine; Haygarth, P. M.; Rosolem, Ciro Antônio

doi:10.1007/s00374-018-1316-3

Cited by 10 publications

(12 citation statements)

References 62 publications

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“…Hypobromite oxidation resulted in a decrease in the concentration of inorganic and organic P in NaOH-EDTA extracts across all soils. The decrease of organic P is consistent with previous studies (Turner and Richardson, 2004;Turner et al, 2012;Almeida et al, 2018). However, Almeida et al (2018) reported an overall increase in the concentration of inorganic P following hypobromite oxidation, which the authors proposed to be caused by the degradation of organic P forms not resistant to hypobromite oxidation.…”

Section: Pools Of Phosphorus In Untreated and Hypobromite Oxidised Sosupporting

confidence: 91%

“…The decrease of organic P is consistent with previous studies (Turner and Richardson, 2004;Turner et al, 2012;Almeida et al, 2018). However, Almeida et al (2018) reported an overall increase in the concentration of inorganic P following hypobromite oxidation, which the authors proposed to be caused by the degradation of organic P forms not resistant to hypobromite oxidation. A decrease in the concentration of organic P in NaOH-EDTA extracts following hypobromite oxidation was expected based on the oxidation of organic molecules containing P. The products of hypobromite oxidation are most probably carbon dioxide, simple organic acids from the oxidative cleavage of the phosphoesters and orthophosphate (Irving and Cosgrove, 1981;Sharma, 2013).…”

Section: Pools Of Phosphorus In Untreated and Hypobromite Oxidised Sosupporting

confidence: 91%

“…The detection of myo-, scyllo-, chiro and neo-IP 6 in untreated and hypobromite oxidised soil extracts is consistent with previous studies using chromatography (Irving and Cosgrove, 1982;Almeida et al, 2018) and NMR (Turner and Richardson, 2004;Doolette et al, 2011a;Vincent et al, 2013;Jarosch et al, 2015;McLaren et al, 2015b). Turner et al (2012) suggested that hypobromite oxidised extracts only contained neo-IP 6 in the 4-equatorial-2-axial conformation due to the absence of signals from the 2-equatorial-4-axial conformation.…”

Section: Phosphorus Assignments Of Sharp Peaks In Hypobromite Oxidisesupporting

confidence: 89%

“…However, this can also occur for IP, and historically, studies often reported the combined concentration of IP 6 and IP 5 due to a lack of differentiation in their elution times (McKercher and Anderson, 1968b). More recently, Almeida et al (2018) investigated how cover crops might mobilise soil IP using hypobromite oxidation on sodium hydroxide-disodium ethylenediaminetetraacetic acid (NaOH-EDTA) extracts followed by chromatographic separation. The authors found that pools of myo-IP 6 and "unidentified IP" accounted for 30 % of the total extractable pool of P and hypothesised that the unidentified-IP pool consists solely of lower-order myo-IP.…”

Section: Introductionmentioning

confidence: 99%

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Identification of lower-order inositol phosphates (IP5 and IP4) in soil extracts as determined by hypobromite oxidation and solution 31P NMR spectroscopy

et al. 2020

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Abstract. Inositol phosphates (IPs) are a major pool of identifiable organic phosphorus (P) in soil. However, insight into their distribution and cycling in soil remains limited, particularly of lower-order IP (IP5 and IP4). This is because the quantification of lower-order IP typically requires a series of chemical extractions, including hypobromite oxidation to isolate IP, followed by chromatographic separation. Here, for the first time, we identify the chemical nature of organic P in four soil extracts following hypobromite oxidation using solution 31P NMR spectroscopy and transverse relaxation (T2) experiments. Soil samples analysed include A horizons from a Ferralsol (Colombia), a Cambisol and a Gleysol from Switzerland, and a Cambisol from Germany. Solution 31P nuclear magnetic resonance (NMR) spectra of the phosphomonoester region in soil extracts following hypobromite oxidation revealed an increase in the number of sharp signals (up to 70) and an on average 2-fold decrease in the concentration of the broad signal compared to the untreated soil extracts. We identified the presence of four stereoisomers of IP6, four stereoisomers of IP5, and scyllo-IP4. We also identified for the first time two isomers of myo-IP5 in soil extracts: myo-(1,2,4,5,6)-IP5 and myo-(1,3,4,5,6)-IP5. Concentrations of total IP ranged from 1.4 to 159.3 mg P per kg soil across all soils, of which between 9 % and 50 % were comprised of lower-order IP. Furthermore, we found that the T2 times, which are considered to be inversely related to the tumbling of a molecule in solution and hence its molecular size, were significantly shorter for the underlying broad signal compared to for the sharp signals (IP6) in soil extracts following hypobromite oxidation. In summary, we demonstrate the presence of a plethora of organic P compounds in soil extracts, largely attributed to IPs of various orders, and provide new insight into the chemical stability of complex forms of organic P associated with soil organic matter.

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Section: Pools Of Phosphorus In Untreated and Hypobromite Oxidised Sosupporting

confidence: 91%

Section: Pools Of Phosphorus In Untreated and Hypobromite Oxidised Sosupporting

confidence: 91%

Section: Phosphorus Assignments Of Sharp Peaks In Hypobromite Oxidisesupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Identification of lower-order inositol phosphates (IP5 and IP4) in soil extracts as determined by hypobromite oxidation and solution 31P NMR spectroscopy

et al. 2020

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“…When fertilized with P, the increase of U. ruziziensis exudation was related to the reduction of soil P recalcitrance, an effective indication of P cycling and mobilization in the soil-plant system (Almeida et al, 2018a). In rotation with soybean, U. ruziziensis increased the labile and moderately labile fractions of P, reducing the residual fraction of the nutrient in the soil (Almeida and Rosolem, 2016).…”

Section: P Cyclingmentioning

confidence: 96%

Urochloa in Tropical Agroecosystems

Baptistella¹,

Andrade

Favarin³

et al. 2020

Front. Sustain. Food Syst.

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Increasing biodiversity is an important issue in more secure and sustainable agriculture. Diversified systems are more resilient to climate change, environmental stresses and enhance soil health, nutrient cycling and nutrient use efficiency. In tropical agroecosystems, cover crops and intercrops are an alternative toward a more diverse and sustainable production. Urochloa spp. (syn. Brachiaria spp.) are perennial grasses, known for their high biomass production. They are commonly used as cover and companion crops in conservation agriculture in the tropics and the residues left in the field after cutting protect the soil and provide nutrient to the next crop cycle or intercropped culture. Urochloa species roots are vigorous, abundant and deep, as opposed to the more shallow and scarce roots of common crops. These traits contribute to carbon sequestration, soil organic matter stabilization and nutrient cycling. Urochloa roots also improve soil physical characteristics and influence soil nutrient dynamics, reducing nutrient losses and enhancing cycling, what is key to achieve greater nutrient use efficiency in agriculture. For instance, Urochloa root exudates can reduce nitrogen losses by denitrification and leaching through a process called biological nitrification inhibition; root exudates can mobilize recalcitrant phosphorus from soils and make it available for plant uptake; the deep roots of these grasses have the potential to recover nutrients that are virtually lost away from the root zone of other crops. This review compiles scientific progress regarding the introduction of Urochloa in agroecosystems, mainly on the aspects related to the contribution to more secure and sustainable agriculture.

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Methodologies for the application of calcium compounds in agropastoral systems: Effects on crop yields

Borges¹,

Hipólito²,

Tokuda³

et al. 2021

Agronomy Journal

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Soil acidity (pH <4.4) restricts exploration by the root system and impairs crop yield. To contribute to the development of alternative methodologies for correcting acidity in the surface and subsurface layers of soil, the present study evaluated the effects of seven combinations of application technique (surface, incorporation under soil tillage, or subsurface) and calcium (Ca) compounds (limestone [LS], phosphogypsum [PG], and hydrated lime [HL]) on soybean [Glycine max (L.) Merr.] and maize (Zea mays L.) grain yields and on the absorption of macronutrients and dry matter yield of palisade grass (Urochloa brizantha syn. Brachiaria brizantha ‘Marandu’) in a Typic Hapludalf in an agropastoral system in Brazil. The experimental design was randomized complete blocks with four replications. The results support the following conclusions: (a) applying HL plus PG is a viable alternative to applying LS plus PG for soybean and maize crops, (b) incorporating LS by plowing and harrowing is not a viable alternative to applying LS on the surface, (c) applying HL plus PG on the subsurface is superior to applying HL plus PG on the surface for soybean and palisade grass cultivation, (d) incorporating LS plus PG followed by annually applying LS on the surface improves palisade grass crop yield, (e) annually applying LS plus PG 2 yr before and annually applying LS plus PG increase palisade grass crop yield, and (f) annually applying LS or HL plus PG increases the absorption of Mg and S by palisade grass.

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Urochloa ruziziensis cover crop increases the cycling of soil inositol phosphates

Cited by 10 publications

References 62 publications

Identification of lower-order inositol phosphates (IP<sub>5</sub> and IP<sub>4</sub>) in soil extracts as determined by hypobromite oxidation and solution <sup>31</sup>P NMR spectroscopy

Identification of lower-order inositol phosphates (IP<sub>5</sub> and IP<sub>4</sub>) in soil extracts as determined by hypobromite oxidation and solution <sup>31</sup>P NMR spectroscopy

Urochloa in Tropical Agroecosystems

Methodologies for the application of calcium compounds in agropastoral systems: Effects on crop yields

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Urochloa ruziziensis cover crop increases the cycling of soil inositol phosphates

Cited by 10 publications

References 62 publications

Identification of lower-order inositol phosphates (IP&lt;sub&gt;5&lt;/sub&gt; and IP&lt;sub&gt;4&lt;/sub&gt;) in soil extracts as determined by hypobromite oxidation and solution &lt;sup&gt;31&lt;/sup&gt;P NMR spectroscopy

Identification of lower-order inositol phosphates (IP&lt;sub&gt;5&lt;/sub&gt; and IP&lt;sub&gt;4&lt;/sub&gt;) in soil extracts as determined by hypobromite oxidation and solution &lt;sup&gt;31&lt;/sup&gt;P NMR spectroscopy

Urochloa in Tropical Agroecosystems

Methodologies for the application of calcium compounds in agropastoral systems: Effects on crop yields

Contact Info

Product

Resources

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Identification of lower-order inositol phosphates (IP<sub>5</sub> and IP<sub>4</sub>) in soil extracts as determined by hypobromite oxidation and solution <sup>31</sup>P NMR spectroscopy

Identification of lower-order inositol phosphates (IP<sub>5</sub> and IP<sub>4</sub>) in soil extracts as determined by hypobromite oxidation and solution <sup>31</sup>P NMR spectroscopy