Soil microbial biomass C:N:P stoichiometry and microbial use of organic phosphorus

Heuck, Christine; Weig, Alfons; Spohn, Marie

doi:10.1016/j.soilbio.2015.02.029

Cited by 374 publications

(200 citation statements)

References 68 publications

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“…In addition, organic P fractions tend to increase in systems with high levels of P, above that required by plants (Aguiar et al 2013;Couto et al 2015;Ye et al 2015). They may be immobilized on the microbial biomass if there are supply sources of C (Lukito et al 1998;Heuck et al 2015).…”

Section: Resultsmentioning

confidence: 99%

Phosphorus fractions in soil with a long history of organic waste and mineral fertilizer addition

et al. 2017

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Applications for long periods of organic animal waste as a source of nutrients to crops can contaminate the soil and the surface and subsurface waters. This study aimed to evaluate how the utilization of organic waste, after successive applications, affects P fractions in the soil and consequently environmental contamination. deep bedding and NPK fertilizer for eight years (urea + triple superphosphate + potassium chloride) provided accumulations of P fractions in the soil that were above the necessary for a proper nutrition to plants considering the available P fractions (AER + organic NaHCO 3 + inorganic NaHCO 3 ) in the soil. In addition, they showed that the use of swine deep bedding, followed by pig slurry, means higher levels of available P fractions in the soil. In this sense, the establishment of a dosage of organic waste to meet the nitrogen need of crops is not an environmentally appropriate parameter. It may cause P accumulation in the soil, increased absorption ability of plants and soil support, contributing to environmental contamination.

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Section: Resultsmentioning

confidence: 99%

Phosphorus fractions in soil with a long history of organic waste and mineral fertilizer addition

et al. 2017

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“…This is consistent with greater labile and total soil C, and acid phosphomonoesterase activity under P fertilization relative to no P-fertilization at our site. Soil C increases from increased biomass production may stimulate phosphatase activities because mineralization of P o can be driven by microbial demand for C (Heuck et al 2015;Spohn and Kuzyakov 2013b), and C has been found to be more limiting than P in P-fertilized weathered soils in western Kenya (Bünemann et al 2004a, b). P fertilization may have also increased acid phosphomonoesterase activity via enhanced root biomass, because plant roots can be a major source of this phosphatase (Nannipieri et al 2011;Renella et al 2006).…”

Section: Benefits Of P Fertilization For Microbial and Enzymatic P Cymentioning

confidence: 99%

Biological P cycling is influenced by the form of P fertilizer in an Oxisol

et al. 2017

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Phosphate rock (PR) is an alternative fertilizer to increase the P content of P-deficient weathered soils. We evaluated the effects of fertilizer form on indicators of biological cycling of P using an on-farm trial on a Rhodic Kandiudox in western Kenya. Treatment plots were sampled after 13 cropping seasons of P applications as Minjingu phosphate rock (PR) or as triple super phosphate (TSP) (50 kg P ha −1 season −1 ), as well as a P-unfertilized control (0 kg P ha −1 season −1 ). Soils (0-15 and 15-30 cm) were analyzed for microbial biomass P (P mic ), activities of acid phosphomonoesterase, alkaline phosphomonoesterase, and phosphodiesterase, and sequentially extractable P fractions. P additions as Minjingu PR yielded 299% greater P mic than TSP at 0-15-cm depth despite similar labile P concentrations in the two P fertilization treatments and stimulated activities of acid phosphomonoesterase (+39%). When added in the soluble form of TSP, a greater percentage of total soil P was present in mineral-bound forms (+33% Fe-and Al-associated P). Higher soil pH under Minjingu PR (pH 5.35) versus TSP (pH 5.02) and the P-unfertilized treatment (pH 4.69) at 0-15-cm depth reflected a liming effect of Minjingu PR. The form of P fertilizer can influence biological P cycling in weathered soils, potentially improving P availability under Minjingu PR relative to TSP via enhanced microbial biomass P and enzymatic drivers of P cycling.

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“…The ratios of C, N, and P in soil microbial biomass can provide information about the ability of microorganisms to adapt to available resources (Fanin et al, 2013), to immobilize nutrients in organic forms, and to release nutrients through organic matter mineralization (He et al, 1997;Heuck et al, 2015). Mooshammer et al (2014) summarized the processes controlling the C : N : P ratio of soil microorganisms feeding on different substrates.…”

Section: Introductionmentioning

confidence: 99%

Soil properties and not inputs control carbon : nitrogen : phosphorus ratios in cropped soils in the long term

Frossard

Buchmann

Bünemann

et al. 2016

SOIL

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Abstract. Stoichiometric approaches have been applied to understand the relationship between soil organic matter dynamics and biological nutrient transformations. However, very few studies have explicitly considered the effects of agricultural management practices on the soil C : N : P ratio. The aim of this study was to assess how different input types and rates would affect the C : N : P molar ratios of bulk soil, organic matter and microbial biomass in cropped soils in the long term. Thus, we analysed the C, N, and P inputs and budgets as well as soil properties in three long-term experiments established on different soil types: the Saria soil fertility trial (Burkina Faso), the Wagga Wagga rotation/stubble management/soil preparation trial (Australia), and the DOK (bio-Dynamic, bio-Organic, and “Konventionell”) cropping system trial (Switzerland). In each of these trials, there was a large range of C, N, and P inputs which had a strong impact on element concentrations in soils. However, although C : N : P ratios of the inputs were highly variable, they had only weak effects on soil C : N : P ratios. At Saria, a positive correlation was found between the N : P ratio of inputs and microbial biomass, while no relation was observed between the nutrient ratios of inputs and soil organic matter. At Wagga Wagga, the C : P ratio of inputs was significantly correlated to total soil C : P, N : P, and C : N ratios, but had no impact on the elemental composition of microbial biomass. In the DOK trial, a positive correlation was found between the C budget and the C to organic P ratio in soils, while the nutrient ratios of inputs were not related to those in the microbial biomass. We argue that these responses are due to differences in soil properties among sites. At Saria, the soil is dominated by quartz and some kaolinite, has a coarse texture, a fragile structure, and a low nutrient content. Thus, microorganisms feed on inputs (plant residues, manure). In contrast, the soil at Wagga Wagga contains illite and haematite, is richer in clay and nutrients, and has a stable structure. Thus, organic matter is protected from mineralization and can therefore accumulate, allowing microorganisms to feed on soil nutrients and to keep a constant C : N : P ratio. The DOK soil represents an intermediate situation, with high nutrient concentrations, but a rather fragile soil structure, where organic matter does not accumulate. We conclude that the study of C, N, and P ratios is important to understand the functioning of cropped soils in the long term, but that it must be coupled with a precise assessment of element inputs and budgets in the system and a good understanding of the ability of soils to stabilize C, N, and P compounds.

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Soil microbial biomass C:N:P stoichiometry and microbial use of organic phosphorus

Cited by 374 publications

References 68 publications

Phosphorus fractions in soil with a long history of organic waste and mineral fertilizer addition

Phosphorus fractions in soil with a long history of organic waste and mineral fertilizer addition

Biological P cycling is influenced by the form of P fertilizer in an Oxisol

Soil properties and not inputs control carbon : nitrogen : phosphorus ratios in cropped soils in the long term

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Soil microbial biomass C:N:P stoichiometry and microbial use of organic phosphorus

Cited by 374 publications

References 68 publications

Phosphorus fractions in soil with a long history of organic waste and mineral fertilizer addition

Phosphorus fractions in soil with a long history of organic waste and mineral fertilizer addition

Biological P cycling is influenced by the form of P fertilizer in an Oxisol

Soil properties and not inputs control carbon : nitrogen : phosphorus ratios in cropped soils in the long term

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Soil properties and not inputs control carbon : nitrogen : phosphorus ratios in cropped soils in the long term