Plant and soil responses to nitrogen and phosphorus fertilization of bromegrass‐dominated haylands in Saskatchewan, Canada

Lkhagvasuren, Bayartulga; Schoenau, Jeff J.; Anderson, Daniel W.; Malhi, S. S.

doi:10.1111/j.1365-2494.2011.00790.x

Cited by 10 publications

(6 citation statements)

References 27 publications

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“…Similarly, STP concentrations have been reported in other grassland studies with varying P application rates in France (Jouany et al 2004 ), Switzerland (Gallet et al 2003 ), Canada (Malhi et al 2003 , 2009 ), and Finland (Lkhagvasuren et al 2011 ), indicating that soil type, soil P content, and management practices encountered in our long-term experiments were representative of grassland management systems in the respective countries.…”

Section: Resultssupporting

confidence: 84%

Soil test phosphorus and cumulative phosphorus budgets in fertilized grassland

Messiga

Ziadi

Jouany

et al. 2015

AMBIO

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We analyzed the linearity of relationships between soil test P (STP) and cumulative phosphorus (P) budget using data from six long-term fertilized grassland sites in four countries: France (Ercé and Gramond), Switzerland (Les Verrières), Canada (Lévis), and Finland (Maaninka and Siikajoki). STP was determined according to existing national guidelines. A linear-plateau model was used to determine the presence of deflection points in the relationships. Deflection points with (x, y) coordinates were observed everywhere but Maaninka. Above the deflection point, a significant linear relationship was obtained (0.33 < r2 < 0.72) at four sites, while below the deflection point, the relationship was not significant, with a negligible rate of STP decrease. The relationship was not linear over the range of STP encountered at most sites, suggesting a need for caution when using the P budget approach to predict STP changes in grasslands, particularly in situations of very low P fertilization. Our study provides insights and description of a tool to improve global P strategies aimed at maintaining STP at levels adequate for grassland production while reducing the risk of P pollution of water.

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Section: Resultssupporting

confidence: 84%

Soil test phosphorus and cumulative phosphorus budgets in fertilized grassland

Messiga

Ziadi

Jouany

et al. 2015

AMBIO

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“…The same was also reported by Rubaek and Sibbesen (2000) for Danish long-term fertilization experiments. It can be speculated that the lack of response to P fertilization may be due to mineralization of organic P or a significant role of arbuscular mycorrhizal fungi in enhancing P turnover and availability, as discussed by, e.g., Lkhagvasuren et al (2011).…”

Section: Resultsmentioning

confidence: 99%

Phosphorus fertilization and herbage production in Finland

Валкама¹,

Virkajärvi²,

Uusitalo³

et al. 2014

SMST

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The herbage yield responses to phosphorus (P) fertilization show large variation and, unlike to cereals, initial soil test P (STP) does not always predict such variation. By using meta-analysis, we reviewed quantitatively 38 Finnish field experiments related to the effects of P fertilization on herbage dry matter (DM) yields in the 1960s – 2000s. The current meta-analysis has several advantages over other type of research aiming to summarize the effect of P fertilization on herbage production. It involves large number of studies, diversity of soils and cultivation zones, and it enables to highlight the sources of variation in responses across the studies. Along with clay and coarse-textured mineral soils, we observed 20 studies on organic soils, whereas previous European and Canadian studies on the same topic involved mostly mineral soils. Moreover, we developed yield response models for different soil textures and initial STP levels. The summarized effect of P fertilization (mean 50 kg P ha-1) on DM yields was 13% over the control (N and K fertilization) with large variation across the studies from –10% to 70%. The major sources of variation were soil texture, soil acidity (for organic soils), initial STP and the yield level in control. For example, the yield response was three times larger on organic soils than on clay or coarse-textured mineral soils. Moreover, the yield response was double on slightly acidic organic soils (29%, n = 8) compared to that on moderately acidic ones (15%, n = 11). Thus, for acidic organic soils, even with low STP, P fertilization may be practically useless until the soils are first limed. Meta-regression proved that generally the responses reduced with increasing initial STP across the studies and reached zero at high STP (PAc, 21 mg l-1). However, in some studies with high control yields, no responses were observed even at low STP, since the responses decreased linearly with increasing control yields. Finally, the responses did not statistically differ between the cultivation zones, cut frequency, decades, or between the studies having different duration of experiments. Variation in herbage yields that is often observed in P fertilizer experiments is only partly related to increasing P rates, but also other factors should be taken into account. Further studies should address to the role of, e.g., soil structure in yield development, as it is evident that additional relevant explanatory variables would be needed to adequately explain the variation in herbage yields.

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“…Also, N uptake is reported to increase with increasing rates of N applied, including rates of N above which herbage production is maximised (Lkhagvasuren, 2007). Nitrogen uptake is also reported to occur in periods of low grass growth (Blombäck and Eckersten, 1997), also resulting in increased CP content but not herbage production.…”

Section: Discussionmentioning

confidence: 99%

The effect of the nitrification inhibitor dicyandiamide (DCD) on herbage production when applied at different times and rates in the autumn and winter

O’Connor

Hennessy

Brophy

et al. 2012

Agriculture, Ecosystems & Environment

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The high rate of urine excreted during animal grazing in late autumn provides a source of nitrogen (N) to the growing sward and also provides the potential for losses of N over the winter months. This study was established to evaluate the potential of applying a nitrification inhibitor, dicyandiamide (DCD), to urine patches to increase N use efficiency in grassland. Four simulated grazing plot experiments were undertaken across two experimental sites, one a free-draining acid brown earth (Experiments 1 and 3) and the other a moderate to heavy brown earth soil (Experiments 2 and 4). Experiments 1 and 2 received no fertiliser N application, and Experiments 3 and 4 received a split application of 350 kg N fertiliser ha −1 year −1. The effect of applying the nitrification inhibitor dicyandiamide (DCD) at 5 or 10 kg DCD ha −1 in autumn and winter to plots receiving synthetic urine or zero urine on spring and annual herbage production was examined in all experiments. The application of DCD did not increase spring herbage production in any of the experiments. Over the two years, the application of 5 or 10 kg DCD ha −1 increased annual herbage production in Experiment 1 when applied to October and November deposited urine patches. Urine application increased herbage production in spring and annually in Experiments 1 and 2, and increased herbage crude protein content and herbage N uptake in all experiments. The application of urine increased soil ammonium and TON content in the 0-100 mm horizon at both sites. The application of 10 kg DCD ha −1 reduced surplus N in Experiment 1 when applied to October and November deposited urine. Overall the effects of DCD on herbage production, surplus N and other parameters in this study were not consistent.

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Plant and soil responses to nitrogen and phosphorus fertilization of bromegrass‐dominated haylands in Saskatchewan, Canada

Cited by 10 publications

References 27 publications

Soil test phosphorus and cumulative phosphorus budgets in fertilized grassland

Soil test phosphorus and cumulative phosphorus budgets in fertilized grassland

Phosphorus fertilization and herbage production in Finland

The effect of the nitrification inhibitor dicyandiamide (DCD) on herbage production when applied at different times and rates in the autumn and winter

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