Soil fertility, nutrition and yield of maize and barley with gypsum application on soil surface in no-till

Fertilidade do solo, nutrição e produtividade de milho e cevada com aplicação de gesso agrícola na superfície do solo em plantio direto

SECTION 3 - SOIL USE AND MANAGEMENT

NOTE

Soil fertility, nutrition and yield of maize and barley with gypsum application on soil surface in no-till⁽¹⁾

Fertilidade do solo, nutrição e produtividade de milho e cevada com aplicação de gesso agrícola na superfície do solo em plantio direto

Leandro Michalovicz^I; Marcelo Marques Lopes Müller^II; José Salvador Simoneti Foloni^III; Jackson Kawakami^II; Ronaldo do Nascimento^IV; Luiz Fernando Machado Kramer^I

^IDoctoral Student, Graduate Studies in Soil and Plant Nutrition, Universidade Estadual de Maringá. Av. Colombo, 5790. CEP 87020-900 Maringa (PR), Brazil. E-mail: [e-mail], [e-mail]

^IIFull Professor, Department of Agronomy, UNICENTRO. Rua Simeão Camargo Varela de Sá, 03. CEP 85040-080 Guarapuava (PR), Brazil. E-mail: [e-mail], [e-mail]

^IIIResearcher, Empresa Brasileira de Pesquisa Agropecuária - Embrapa Soja. Rua Carlos João Strass, Bairro Warta. CEP 86001-970 Londrina (PR), Brazil. E-mail: [e-mail]

^IVMaster's Student, Graduate Studies in Agronomy, UNICENTRO. E-mail: [e-mail]

SUMMARY

Annual crop yield and nutrition have shown differentiated responses to modifications in soil chemical properties brought about by gypsum application. The aim of this study was to evaluate the effect of gypsum application rates on the chemical properties of a Latossolo Bruno (Clayey Oxisol), as well as on the nutrition and yield of a maize-barley succession under no-till. The experiment was set up in November 2009 in Guarapuava, Parana, Brazil, applying gypsum rates of 0.0, 1.5, 3.0, 4.5, and 6.0 Mg ha^-1 to the soil surface upon sowing maize, with crop succession of barley. Gypsum application decreased the levels of Al³⁺ and Mg²⁺ in the 0.0-0.1 m layer and increased soil pH in the layers from 0.2-0.6 m depth. Gypsum application has increased the levels of Ca²⁺ in all soil layers up to 0.6 m, and the levels of S-SO₄^2- up to 0.8 m. In both crops, the leaf concentrations of Ca and S were increased while Mg concentrations have decreased as a function of gypsum rates. There was also an effect of gypsum rates on grain yield, with a quadratic response of maize and a linear increase for barley. Yield increases were up to 11 and 12 % in relation to control for the maximum technical efficiency (MTE) rates of 3.8 and 6.0 Mg ha^-1 of gypsum, respectively. Gypsum application improved soil fertility in the profile, especially in the subsurface, as well as plant nutrition, increasing the yields of maize and barley.

Index terms: phosphogypsum, calcium saturation, sulfur, Zea mays, Hordeum vulgare.

RESUMO

A produtividade e a nutrição de culturas anuais têm apresentado respostas diferenciadas às alterações nos atributos químicos do solo promovidas pela aplicação de gesso agrícola. O objetivo deste trabalho foi avaliar o efeito de doses de gesso agrícola nos atributos químicos de um Latossolo Bruno e na nutrição e produtividade da sucessão milho-cevada sob plantio direto. O experimento foi iniciado em novembro de 2009 em Guarapuava, PR, aplicando-se doses de 0,0; 1,5; 3,0; 4,5; e 6,0 Mg ha^-1 de gesso na superfície do solo, no momento da semeadura do milho, que foi sucedido pela cevada. A aplicação do gesso reduziu os teores de Al³⁺e Mg²⁺ na camada de 0,0-0,1 m e elevou o pH do solo nas camadas entre 0,2-0,6 m de profundidade. As doses de gesso aumentaram os teores de Ca²⁺ em todas as camadas até a profundidade de 0,6 m; e os de S-SO₄^2-, até 0,8 m. Nas duas culturas, os teores foliares de Ca e S aumentaram e os de Mg diminuíram em razão das doses de gesso. Houve efeito das doses gesso também sobre a produtividade, com resposta quadrática do milho e aumento linear no caso da cevada, sendo os acréscimos de produtividade de até 11 e 12 % superiores à testemunha, respectivamente nas doses de máxima eficiência técnica (MET) de 3,8 e 6,0 Mg ha^-1 de gesso. A aplicação de gesso melhorou a fertilidade do solo no perfil, sobretudo em subsuperfície, e a nutrição das plantas, elevando a produtividade do milho e da cevada.

Termos de indexação: fosfogesso, saturação de cálcio, enxofre, Zea mays, Hordeum vulgare.

INTRODUCTION

Cultivated area under no-till (NT) has significantly increased in Brazil in recent decades (Mello & Raij, 2006), totalizing more than 32 million hectares (Febrapdp, 2011). The wide adoption of NT is due to the advantages of this conservationist management system in tropical and subtropical regions, mainly because it is less costly and less time consuming, controls hydric soil erosion, reduces production costs, and increases soil organic matter and fertility (Romeiro, 1998).

In areas with consolidated NT, due to the absence of soil tillage operations, soil acidity is corrected with surface applications of soil amendments, normally using lime rates equivalent to 50 % of the lime requirement of the soil, considering the 0-20 cm layer. Furthermore, due to the fact that lime has lower solubility and vertical mobility in the soil profile than gypsum, especially in clayey soils (Amaral et al., 2004), subsurface layers show Al³⁺ toxicity and, or, Ca²⁺ deficiency increasingly with time, limiting root development and, therefore, decreasing water and nutrient uptake by plants, resulting in recurrent yield reduction when little or poor rainfall distribution occurs (Caires et al., 2001).

Gypsum is not a soil acidity amendment. It is a source of Ca²⁺ and sulfate (SO₄^2-), and due to its high solubility when compared to lime, it exhibits expressive mobility in the soil profile, improving the root environment in deeper layers by the supply of Ca²⁺ and decrease in Al³⁺ activity (Ramos et al., 2006) when Al³⁺ associates with SO₄^2- (Caires et al., 2003). The enhancement of soil fertility in the subsurface layers allows greater root development, favoring the uptake and recycling of nutrients, such as N, mainly in the nitrate (NO₃^-) form, which are carried to deeper soil layers.

Traditionally studied in regions with a dry winter in central Brazil, especially in Cerrado (Brazilian tropical savanna) soils, gypsum application has also been evaluated in NT in southern Brazil. The effects on soil chemical properties have proven to be consistent, with the intensity of variations depending on local edaphic, climatic, and management conditions. Increases in Ca²⁺, SO₄^2-, and Mg²⁺ levels at deeper soil layers are common results for gypsum field experiments (Caires et al., 2003; Rampim et al., 2011).

However, the effects of gypsum on crop yield have proven to be more variable. Grasses like maize (Zea mays), wheat (Triticum aestivum), and barley (Hordeum vulgare) have shown significant yield increases with gypsum application (Rashid et al., 2008; Caires et al., 2001, 2011b), while legumes like soybean (Glycine max) have shown no yield effect (Caires et al., 2011a). For plant nutrition, both grasses and legumes have shown significant responses to gypsum application, with increases in leaf levels of Ca and S, and a decrease in Mg levels (Caires et al., 2003).

The aim of this study was to evaluate the effects of gypsum application rates on the chemical properties of an Oxisol and on the nutrition and yield of maize and barley under NT. The hypothesis is that gypsum application may improve plant nutrition and yield in the NT system due to its effect of decreasing aluminum levels and increasing Ca and S availability throughout the soil profile.

MATERIALS AND METHODS

The study began in November 2009 in the Experimental Field of the Universidade Estadual do Centro-Oeste in Guarapuava, Parana, Brazil, where the climate is Humid Subtropical Mesothermal - Cfb (Wagner et al., 2009). Figure 1 shows the rainfall and temperature data throughout the period of study obtained from a meteorological station (25º 23' S, 51º 30' W and 1,026 m asl) from the Agronomic Institute of Paraná (IAPAR), 200 m away from the study area, which had been managed under NT for at least 10 years. From 2005-2009, there was the following crop succession: maize for silage in summer; oat + Italian ryegrass as soil cover in winter. Soil morphological and chemical characterization plus clay content determination were carried out in October 2009 (Table 1), and the soil was classified as a Latossolo Bruno (Clayey Oxisol) (Embrapa, 2006).

A randomized complete block design was used, with four replications, and plots of 16 × 6.4 m. The treatments consisted of four rates of gypsum (17 % Ca; 14 % S; 0.2 % P, and 13 % moisture): 1.5, 3.0, 4.5, and 6.0 Mg ha^-1 (dry weight), plus a control treatment (without gypsum). The rates were applied on the soil surface soon after maize (Premium Flex^®) was sown on November 10, 2009, with row spacing of 0.8 m and an adjusted stand of 65,000 plants ha^-1. Fertilization in the planting furrow was 300 kg ha^-1 of the 08-28-16 NPK formulation, plus side-dressing fertilizations with urea in two applications at the V4 and V6 stage (Ritchie et al., 1993), for a total of 140 kg ha^-1 N. Barley (BRS Cauê^®) was sown on July 6, 2010 with row spacing of 0.17 m and an adjusted stand of 250 plants m^-2. The fertilization on the planting furrow was 250 kg ha^-1 of the 08-30-20 NPK formulation, plus a side-dressing fertilization with 60 kg ha^-1 N at tillering.

Leaf tissue sampling was performed when 50 % or more of the plants were at the R1 stage for maize (Ritchie et al., 1993) and 10.5 in the Feekes-Large system for barley (Large, 1954) in the central areas of each plot, sampling the ear leaf for maize (30 per plot), opposite and below the ear, and the flag leaf for barley (60 per plot). The levels of P, K, Ca, Mg, and S in the leaves were determined after nitric-perchloric digestion, and the levels of N after sulfuric digestion (Malavolta, 1997).

When the crops achieved physiological maturation, they were harvested manually to estimate yield, also from the central areas of the plots: 12.8 m² per plot for maize and three sub-samples of 1.0 m² of each per plot for barley, taking the average of the three observations as the mean of the plot. Grain weight was adjusted to the moisture of 130 g kg^-1.

The soil was sampled six months after gypsum application (May 2010), between maize harvest and barley sowing, with 12 sub-samples per plot forming composite samples of each soil layer: 0.0-0.1, 0.1-0.2, 0.2-0.4, 0.4-0.6, and 0.6-0.8 m depth. Soil chemical analysis was carried out according to Pavan et al. (1992) to determine organic carbon (OC), pH in CaCl₂, Al³⁺, H+Al, Ca²⁺, Mg²⁺, K⁺ and P (Mehlich-1). For S-SO₄, the extracted was performed with 0.01 mol L^-1 calcium phosphate (Cantarella & Prochnow, 2001) and determined by the turbidimetric method (Vitti & Suzuki, 1978).

The results were subjected to analysis of variance and, in the case of significance (p<0.05), regression analysis was also performed, fitting models as a function of gypsum rates and adopting the model with the highest level of significance. Correlation analysis was also performed for some data in order to complement the results discussion.

RESULTS AND DISCUSSION

The gypsum application rates had no significant effect on soil pH at depths of 0.0-0.1, 0.1-0.2, and 0.6-0.8 m (Figure 2a), with the same happening for H+Al in all the soil layers studied (Figure 2b). As gypsum is a neutral salt and has no corrective properties on soil acidity, changes in soil pH and H+Al are not expected due to its application (Raij, 2008). These results are in agreement with those from Caires et al. (2002; 2004), who observed no effect of gypsum on soil pH up to a depth of 0.4 m and on H+Al up to a depth of 0.8 m in a medium-textured Latossolo Vermelho (Oxisol) of Ponta Grossa, PR.

However, soil pH was increased by gypsum application in layers from 0.2-0.6 m (Figure 2a). The S-SO₄^2- added by gypsum is strongly repelled from near surface layers in soils that are relatively high in organic matter (OM) due to predominant negative charges and displacement from positive charges by phosphate. In subsurface layers and in high concentrations, S-SO₄^2- reacts with Fe and Al oxides (hydroxides), releasing OH^- ions in the soil solution and leading to a small increase on pH (Raij, 2008). These results are corroborated by Caires et al. (1999), who also reported an increase on soil pH at 18 and 40 months after gypsum application in layers from 0.2-0.8 m in an Oxisol. Despite the statistical significance of this effect and the possible improvement in root environment caused by gypsum, the pH changes recorded are not sufficient to lead to substantial modifications in soil chemical reaction to the point of considering it a neutralization reaction, as caused by lime application (Raij, 2008).

Levels of Al³⁺ showed a linear decrease in the 0.0-0.1 m layer as a function of gypsum rates (Figure 2c). The observation of negative correlation between levels of Al³⁺ and S-SO₄^2- (r = -0.48, p<0.05) in this layer provided evidence that the S-SO₄^2- increases led to the formation of ionic pairs between Al³⁺ and S-SO₄^2-, such as AlSO₄⁺, which decreases the activity of Al³⁺ in the soil solution and is more readily leached from surface layers due to lower valence in comparison to Al³⁺ (Zambrosi et al., 2007). The Al³⁺ levels in the 0.0-0.1 m layer (Figure 2c) were also negatively correlated with maize yield (r = -0.50, p<0.05) and barley yield (r = -0.46, p< 0.05), indicating that the decrease in the Al³⁺ level caused by gypsum application was beneficial to the yield of both crops.

Gypsum application rates brought about linear increases in S-SO₄^2- levels in all the soil layers evaluated, which was due to the gypsum composition, with 14 % (mass) of S. In addition, the relatively low retention and high leaching of S-SO₄^2- from near surface layers was evidenced by the higher levels of S-SO₄^2- in deeper layers, mainly at higher gypsum rates (Figure 2d). Accumulated rainfall in the first six months after gypsum application, i.e., up to soil sampling, was 1,180 mm and proved to be enough to bring about significant movement of S-SO₄^2- to the deepest layer evaluated. Various authors have already reported that vertical movement of S-SO₄^2- depends on the soil texture and hydrological regime, being slower in clayey soils and/or drier regions (Caires et al., 2004; Raij, 2008).

There was no effect of gypsum on P levels (Figure 2e), countering the results of Caires et al. (2011b), which showed a linear increase in P in the 0.00-0.05 and 0.05-0.10 m layers due to gypsum application in another Oxisol from Guarapuava. This divergence might be due to differences in soil sampling, depending on the proportion of sub-samples between rows and in rows since soil sampling in the row has a strong effect on P fertilization in the furrow during sowing. Another possibility is a difference in the residual levels of P in the gypsum, which are variable according to the isomorphic substitutions in the phosphatic rock used to produce the phosphoric acid (Raij, 2008), because gypsum is a byproduct of this reaction.

The Ca²⁺ levels exhibited a linear increase in layers between 0.0-0.6 m after gypsum application (Figure 3a), which is explained by the presence of 17 % of Ca²⁺ in the gypsum composition. Increases in the Ca²⁺ level through the soil profile is considered a differential and positive effect of gypsum in comparison to lime, improving subsurface soil fertility regardless of tillage. Ernani et al. (2001) reported greater and faster vertical movement of Ca²⁺ in the soil profile by gypsum application in comparison to calcitic lime application. According to Caires et al. (2011b), the movement of Ca²⁺ in the soil profile depends on the gypsum rates applied, soil texture, and volume of accumulated rainfall. In the present study, the relatively fast vertical movement of Ca²⁺, considering the clayey texture, can be attributed to the rainfall (1,180 mm) and the fact that 20-30 % of the applied gypsum may have remainded in the form of CaSO₄⁰ (Pavan et al., 1984), which due to zero valence has greater vertical mobility. Rampim et al. (2011) verified expressive increases in Ca²⁺ levels in the 0.0-0.4 m layer nine months after gypsum application in a clayey Oxisol from Guaira, PR.

The levels of Mg²⁺ decreased in the 0.0-0.1 m layer due to gypsum application (Figure 3b). Adding increasing amounts of Ca²⁺ to the soil by gypsum may release part of the Mg²⁺ that was adsorbed on soil colloids, displacing them to the soil solution to be taken up by plants and, or, react with SO₄^2-. If the ionic pair MgSO₄⁰ is formed, it may easily be moved to deeper soil layers due to its valence. Studying ionic speciation in a dystrophic Oxisol after gypsum application, Zambrosi et al. (2007) observed that SO₄^2- was the inorganic anion that most interacted with Mg²⁺, supporting the inferences of vertical movement of both ions through the soil profile.

In the layers from 0.1-0.4 m, there was a linear increase in Mg²⁺ levels (Figure 3b), confirming that the addition of gypsum can lead to the redistribution of this nutrient in the soil profile. The increases in subsurface layers occur by dissociation of MgSO₄⁰ since the anion SO₄^2- is more strongly adsorbed in more acidic and less electronegative soil, typical characteristics of subsurface layers (Raij, 2008). The improvement in soil fertility at deeper layers brought about by movement of basic cations, in this case Mg²⁺, in the soil profile is a positive effect of gypsum since any decline in this nutrient levels at surface layers, were enough to achieve the point to cause Mg deficiency on crops.

There was no effect of gypsum on soil K⁺ levels (Figure 3c), indicating that the rates applied did not lead to leaching of this cation. In contrast with Mg²⁺, vertical movement of K⁺ in the profile through gypsum applications have been smaller (Caires et al., 2002) and more common when the soil K⁺ levels are considered high. This result agrees with results from Caires et al. (2004), who observed no effect of gypsum rates on soil K⁺ levels.

The soil Ca²⁺/Mg²⁺ ratio increased in a linear manner in the soil, except for the 0.1-0.2 and 0.6-0.8 m layers (Figure 3d). This is explained by the competition between these cations for adsorption sites (Foloni et al., 2008) and reflect their isolated behavior, which showed an increase in Ca²⁺ levels along the soil profile, except for the 0.6-0.8 m layer, and movement of Mg²⁺ from the 0.0-0.1 to 0.1-0.2 and 0.2-0.4 m layer, enough to counter the Ca²⁺ increase in the 0.1-0.2 m layer.

Ribas (2010) evaluated 1,217 soil chemical analyses in the same municipality as this study and reported that 48.7 % of the samples had intermediate Ca²⁺/Mg²⁺ values (1.5< Ca²⁺/Mg²⁺ <3.5), and another 48.8 % had low values (Ca²⁺/Mg²⁺ 1.5) according to Kelling & Peters (2004). These results were attributed to the widespread and long-term use of dolomitic lime in the region. For that reason, the increase in the Ca²⁺/Mg²⁺ ratio brought about by gypsum can be beneficial to crops, as reported by Caires et al. (2011b), who evaluated gypsum rates in Guarapuava, PR, verifying that maize yield was positively correlated with the soil Ca²⁺/Mg²⁺ ratio.

As for the nutritional status of the crops, gypsum application led to a linear increase in leaf content of N in maize; however, there was no effect in barley (Figure 4a). The higher fertility in deeper soil layers with gypsum, through the increase on pH values and levels of Ca²⁺ and Mg²⁺, would permit greater distribution of roots in deeper layers, giving opportunity to the crops to recover greater amounts of water and nutrients, especially those species with deeper root systems and those nutrients that might easily be leached, like N in the nitrate (NO₃^-) form. Caires et al. (2004) and Matula & Pechová (2007) reported enhancements in N leaf content in maize and barley, respectively, by gypsum application, with the effects being attributed to improvement in subsoil fertility and better relative distribution of the root system at greater depth.

The leaf contents of P (Figure 4b) and K (Figure 4c) were not affected by gypsum in either crop, corroborating Raij et al. (1998) for maize, and Caires et al. (2001) for barley. The lack of effect of gypsum on the leaf content of these nutrients reflected their behavior in the soil since they were not affected by gypsum application rates in any of the soil layers evaluated (Figures 2e and 3c).

In contrast, leaf contents of Ca (Figure 4d) and S (Figure 4f) were both enhanced in maize and barley through gypsum application. The increase in the leaf content of these nutrients agree with their increased levels in the soil profile due to gypsum, since gypsum is a source of these nutrients. In this study, both maize and barley yields were positively correlated (p<0.01) with the leaf contents of Ca (r = 0.69 and 0.52) and S (r = 0.64 and 0.57), showing that the supply of these nutrients by gypsum was relevant to increasing yields. The level of S-SO₄^2- in the 0.0-0.1 m layer of the soil under study (Table 1) is considered low according to the literature (CQFSRS/SC, 2004), and the response of crop yield to the supply of this nutrient through gypsum is an important fact in the present and for the future, considering the growing use of more concentrated NPK fertilizers over the past decades, which have a lower percentage of single superphosphate in their composition and, consequently, less gypsum, leading to minor additions of S to the soils and less availability of S to the plants.

Leaf content of Mg decreased in a linear manner in maize through gypsum application (Figure 4e). The Mg reduction concomitant with the Ca increase in the 0.0-0.1 m soil layer due to gypsum (Figure 3b) may have limited Mg availability to the crop, at least in early stages, with a negative impact on uptake (Figure 4e), due to competitive uptake between nutrients (Medeiros et al., 2008). An overall positive correlation (r = 0.52, p<0.05) of Mg leaf content with maize yield was recorded, but the yield response to gypsum was quadratic (Figure 5), so the first decreases in Mg content may not have been detrimental to yield, but beneficial. Support for this is in the sufficiency range of 2.5-4.0 g kg^-1 of Mg in maize (Martinez et al., 1999), and with 0 and 1.5 Mg ha^-1 of gypsum, the leaf content of Mg remained above the sufficiency limit.

For barley, the response of Mg leaf content was quadratic (Figure 4e), with increases in Mg up to 2.9 Mg ha^-1 of gypsum. Matula & Pechová (2007) also observed higher Mg in barley after application of 3.5 Mg ha^-1 of gypsum. The yield of barley, however, increased linearly with gypsum application (Figure 5), indicating no problem with Mg status in the leaves.

The quadratic response of maize yield to gypsum application rates (Figure 5) made it possible to establish maximum technical efficiency (MTE) at 3.8 Mg ha^-1 of gypsum, with an estimated yield of 10.9 Mg ha^-1 - 11 % greater than the control treatment. This result is according to Caires et al. (2011b), who evaluated gypsum application in a high fertility Oxisol, also in Guarapuava, PR, reporting an increase of 11 % in maize yield with an MTE of 7.8 Mg ha^-1 of gypsum. The difference among MTEs in the same crop in two studies made in the same region shows the relevance of determining additional parameters for recommending the use of gypsum, and it is fundamental to establish the effects of this product in different initial conditions of soil fertility, mainly in relation to the levels of nutrients that can be mobilized in the soil profile.

There was a linear increase in barley yield through gypsum application (Figure 5). According to the fitted equation, the gypsum rate of 6 Mg ha^-1 corresponded to an estimated grain yield of 4.9 Mg ha^-1, 12 % greater than the control treatment. During the crop cycle (July to November 2010), rainfall was 33.5 % lower than the historical mean of the period (Figure 1), and in this scenario gypsum might have contributed to an MTE with a higher gypsum rate in barley than in maize. The improvement in soil fertility and the root environment in the subsurface brought about by gypsum results in better root growth in deeper soil layers, favoring water and nutrient uptake by crops. These results are corroborated by Caires et al. (2001), who observed better relative distribution of the root system in deeper soil and an increase of 23 % in barley yield with the application of 9 Mg ha^-1 of gypsum in relation to the control, under severe water stress.

The results obtained in this work, as in another studies (Caires et al., 2011a,b; Rampim et al., 2011), showed the positive response of some crops to gypsum application, even with gypsum rates greater than the rates recommended based on clay percentage of the soil, e.g., clay % × 50 (Sousa et al., 2005) or × 60 (Raij et al., 1996). Therefore, it is essential to determine parameters in addition to clay percentage for estimating the gypsum rates to be applied. It is necessary to intensify and regionalize these studies, which should last long enough to observe results for crop rotation.

CONCLUSIONS

1. Gypsum improved soil fertility in the profile, increasing levels of Ca²⁺ and S-SO₄^2-, distributing Mg²⁺ from surface to subsurface layers, decreasing Al³⁺ on the surface and slightly increasing soil pH in the subsurface layers.

2. Increased Ca and S in maize and barley leaves as a function of gypsum were positively correlated with grain yield, and Mg leaf content was positively correlated with maize yield.

3. Maize and barley responded to gypsum application, with yield increases at higher gypsum rates than the ones determined by methods traditionally based on clay content.

LITERATURE CITED

Received for publication on October 30, 2013 and approved on June 11, 2014.

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(1

) Part of the first author's Master Dissertation, presented in the Universidade Estadual do Centro-Oeste - UNICENTRO.

Publication Dates

• Publication in this collection
  03 Nov 2014
• Date of issue
  Oct 2014

History

• Received
  30 Oct 2013
• Accepted
  11 June 2014