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PERFORMANCE OF TIFTON 85 GRASS UNDER FERTIRRIGATION WITH SLAUGHTERHOUSE WASTEWATER

ABSTRACT:

The aim of this study was to evaluate the performance of Tifton 85 grass cultivated in soil columns and fertilized with different wastewater doses of swine slaughterhouse. The experiment was conducted in the Environmental Engineering Center and Sanitary of UFLA/MG in PVC columns filled with Dark Red Latosol (Oxisol) and randomly distributed. The treatments applied with nitrogen based load (300 kg ha de N years−1) consisted of four doses of SW and AQT0 control at random. Three cuts were performed, at 60, 90 and 120 days after planting. The highest yields were 10.06, 16.82 and 20.39 t ha−1 in AQT0, AAT4 and AAT3 treatments, respectively. With the increase of nutrients by N rates and root development of Tifton 85 grass, we observed higher extractions of N, P and K in the second and third cut, with maximum extraction of 384 and 10.3 kg ha−1 of N and P in the higher dose treatments (AAT4), while the maximum extraction of the potassium was 117.7 kg ha−1 in the AAT3 treatment. There was productivity restriction in the third cut due to the reduction of availability of essential nutrients and losses by leaching.

KEYWORDS:
productivity; forage; nutrients; disposal; agroindustrial wastewaters

INTRODUCTION

Due to the scarcity of water resources and the growing demand for good quality water, several studies have been conducted over the years in order to search for viable alternatives to irrigation using lower quality water. Thus, Silva et al. (2011)Silva DF, Matos AT, Pereira OG, Cecon PR, Barista RO, Moreira DA (2011) Alteração química de solo cultivado com capim Tifton 85 (Cynodon spp.) e fertirrigado com percolado de resíduo sólido urbano. Acta Scientiarum Technology 33(3):243–251. DOI: http://dx.doi.org/10.4025/actascitechnol.v33i3.6124
http://dx.doi.org/10.4025/actascitechnol...
argue that the reuse of wastewater for irrigation purposes contributes to the controlling of environmental pollution, saving water and fertilizers, recycling nutrients and increasing agricultural production.

High nutritional content and organic matter, coming from production process, characterize the wastewater from slaughterhouse; therefore, prior treatment is necessary before its final destination (Mees et al., 2009Mees JBR, Gomes SD, Vilas Boas MA, Fazolo A, Sampaio SC (2009) Removal of organic matter and nutrients from slaughterhouse wastewater by using Eichhornia crassipes and evaluation of the generated biomass composting. Engenharia Agrícola 29(3):466–473. DOI: http://dx.doi.org/10.1590/S0100-69162009000300013
http://dx.doi.org/10.1590/S0100-69162009...
; Tocchi et al., 2013Tocchi C, Federici E, Scargetta S, D'annibale A, Patruccioli M (2013) Dairy wastewater polluting load and treatment performances of an industrial three-cascade-reactor plant. Process Biochemistry 48:941–944. DOI: http://dx.doi.org/10.1016/j.procbio.2013.04.009
http://dx.doi.org/10.1016/j.procbio.2013...
). According to Cabral et al. (2011)Cabral JR, Freitas PSL, Rezende R, Muniz AS, Bertonha A (2011) Impacto da água residuária de suinocultura no solo e na produção de capim-elefante. Revista Brasileira de Engenharia Agrícola e Ambiental 15(8):823–831. DOI: http://dx.doi.org/10.1590/S1415-43662011000800009
http://dx.doi.org/10.1590/S1415-43662011...
, the disposal of wastewater in the soil, as an alternative of final destination, in addition to water source, promotes the nutritional increment for the development of cultivars, reducing production costs.

The fertirrigation with wastewater offers socioeconomic and environmental benefits, mainly the reduction of effluent release in the bodies of water and the recovery of nutrients (Rodríguez-Liébana et al., 2014Rodríguez-Liébana JA, Elgouzia S, Mingorancea MD, Castilloa A, Peña A (2014) Irrigation of a Mediterranean soil under field conditions with urbanwastewater: effect on pesticide behaviour. Agriculture, Ecosystems & Environment 185:176–185. DOI: http://dx.doi.org/10.1016/j.agee.2013.12.026
http://dx.doi.org/10.1016/j.agee.2013.12...
), allowing to reduce the use of chemical fertilizers (Gil & Ulloa, 1997Gil I, Ulloa JJ (1997) Positive aspects of the use of water: the reuse of urban wastewater and its effect on areas of tourism. Mediterraneennes, 31:218–229. Available: http://agris.fao.org/aos/records/QC1997001469. Accessed: Aug 8, 2016.
http://agris.fao.org/aos/records/QC19970...
). However, depending on the origin and quality of the effluent, there are risks of soil and crops contamination by pathogens (Palese et al., 2009Palese AM, Pasquale V, Celano G, Figliuolo G, Masi S, Xiloyannis C (2009) Irrigation of olive groves in Southern Italy with treated municipal wastewa-ter: effects on microbiological quality of soil and fruits. Agriculture, Ecosystems & Environment 129:43–51. DOI: http://dx.doi.org/10.1016/j.agee.2008.07.003
http://dx.doi.org/10.1016/j.agee.2008.07...
), as well as promoting salt accumulation, pH alteration and a decrease in soil infiltration rate (Bedbabis et al., 2014Bedbabis S, Rouina BB, Boukhris M, Ferrara G (2014) Effect of irrigation with treated wastewater on soil chemical properties and infiltration rate. Journal of Environmental Management 133:45–50. DOI: http://dx.doi.org/10.1016/j.jenvman.2013.11.007
http://dx.doi.org/10.1016/j.jenvman.2013...
). On the other hand, in comparison to surface waters and/or groundwater, the use of wastewater in irrigation increases biomass production and improves crop productivity (Jang et al., 2012Jang TI, Kim HK, Seong CH, Lee EJ, Park SW (2012) Assessing nutrient losses of reclaimed wastewater irrigation in paddy fields for sustainable agriculture. Agricultural Water Management 104:235–243. DOI: http://dx.doi.org/10.1016/j.agwat.2011.12.022
http://dx.doi.org/10.1016/j.agwat.2011.1...
; Mojid et al., 2012Mojid MA, Biswas SK, Wyseure GCL (2012) Interaction effects of irrigation by municipal wastewater and inorganic fertilisers on wheat cultivation in Bangladesh. Field Crops Research 134:45–50. DOI: http://dx.doi.org/10.1016/j.fcr.2012.06.010
http://dx.doi.org/10.1016/j.fcr.2012.06....
). Therefore, finding a balance between the uses of these waters in conjunction with mineral fertilization is of great necessity, reducing fertilizer costs, in addition to providing a noble destination for these waters, increasing production, reducing fertilizer costs and increasing profitability of the producer.

Among the tropical pastures, Tifton 85 grass belonging to the Cynodon genus has been widely used in animal feed due to its higher production, nutritional content and good resistance to seasonality in relation to other genera, with a lower basal temperature of 12 ºC (Corrêa & Santos, 2006Corrêa LA, Santos PM (2006) Irrigação de pastagens formadas por gramíneas forrageiras tropicais. São Carlos, Embrapa Pecuária Sudeste, 6p. (Comunicado Técnico, 48).).

Some studies point to significant productivities of fertirrigated grasses with wastewater, such as Prior et al. (2015)Prior M, Sampaio SC, Nóbrega HP, Dieter J, Costa MSSdeM (2015) Estudo da associação de água residuária de suinocultura e adubação mineral na cultura do milho e no solo. Engenharia Agrícola 35(4):744–755. DOI: http://dx.doi.org/10.1590/1809-4430-Eng.Agric.v35n4p744-755/2015
http://dx.doi.org/10.1590/1809-4430-Eng....
studying the association of swine wastewater and mineral fertilization in maize crop; and Fia et al. (2010)Fia R, Matos AT, Fia FRL, Matos MP, Lamber TF, Nascimento FS (2010) Desempenho de forrageiras em sistemas alagados de tratamento de águas residuárias do processamento do café. Revista Brasileira de Engenharia Agrícola e Ambiental 14(8):842–847. DOI: http://dx.doi.org/10.1590/S1415-43662010000800008
http://dx.doi.org/10.1590/S1415-43662010...
evaluating forage performance in flooded water treatment systems for coffee processing.

The aim of this study was to evaluate the performance of Tifton 85 grass cultivated in soil columns and fertirrigated with different doses of wastewater from swine slaughterhouse.

MATERIAL AND METHODS

The experiment was carried out at the Federal University of Lavras, Lavras, Minas Gerais, latitude 21°13′45″S, longitude 44°58′31″W, average altitude of 918 m and Cwa climate, (mesothermal or tropical altitude), with dry winter and rainy summer, according to the Köppen classification (Sá Junior et al., 2012Sá Junior A, Carvalho LG, Silva FF, Alves MC (2012) Application of the Köppen Classification for climatic zoning in the state of Minas Gerais, Brasil. Theoretical and Applied Climatology 108:1–7. DOI: http://dx.doi.org/10.1007/s00704-011-0507-8
http://dx.doi.org/10.1007/s00704-011-050...
).

The soil used in the experiment was classified as Dark Red Latosol (EMBRAPA, 2013EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária (2013) Sistema brasileiro de classificação de solos. 3 ed. Rio de Janeiro, Centro Nacional de Pesquisa de Solos. 353p.). The chemical and physical characteristics of the soil are presented in Table 1, before the application of the treatments.

TABLE 1
Physical and chemical characterization of the soil used in filling columns.

The experimental system consisted of 15 soil columns constructed of PVC with a diameter of 0.30 m (area of 0.07 m2) and 1.20 m of height. The columns were filled from the base with 0.05 m of nº zero gravel, 0.05 m of thick washed sand and 1.05 m of Dark Red Latosol. The soil columns were cultivated with Tifton 85 grass (Cynodon spp.) as shown in Figure 1. Soil liming was carried out to fill the 0.30 m surface of all 15 columns with the use of calcium carbonate PA (CaCO3).

FIGURE 1
Schematic configuration of the soil column profile used in the experiment.

The different treatments included the application of the Swine Slaughterhouse Wastewater (SW) from an agro-industry of Lavras-MG, in four different loads, and another with conventional chemical fertilization (AQT0) characterized as standard treatment. The applications of the treatments occurred monthly, between August and December 2015, following the recommendation of 300 kg ha−1 year−1 of nitrogen proposed by the Soil Fertility Commission of the State of Minas Gerais (Ribeiro et al., 1999Ribeiro AC, Guimarães PTG, Alvarez VH, (eds) (1999) Recomendações para o uso de corretivos e fertilizantes em Minas Gerais: 5. Aproximação. Viçosa, Comissão de Fertilidade do Solo do Estado de Minas Gerais. 359 p.) for pasture. Adopting the AQT0 standard as the recommended dosage of N, N dosages were tested via wastewater at the following dosages: 100, 200, 300 and 400% of the recommendation.

The SW characterizations were performed monthly in the Laboratory of Analysis of Wastewater of the Nucleus of Environmental and Sanitary Engineering of the Engineering Department of UFLA, following the methodology proposed by APHA; AWWA and WEF (2012)APHA - American Public Health Association, AWWA - American Water Works Association, WEF - Water Environment Federation. (2012) Standard methods for the examination of water and wastewater. 22 ed. Washington, 1496p.. The results are shown in Table 2.

TABLE 2
Characterization of slaughterhouse wastewater (SW) applied during the experimental period.

During the growth cycles of Tifton 85 grass, some of the required water was supplied by SW application and another part came from irrigation management with water from the UFLA supply system. The climatic data, necessary for the estimation of the reference evapotranspiration (ETo) by the Penman-Monteith equation (Allen et al., 2006Allen RG, Pereira LS, Raes D, Smith M (2006) Evapotranspiration del cultivo: guias para la determinación de los requerimientos de agua de los cultivos. FAO, 298p. (Paper, 56).; Carvalho et al., 2011Carvalho LG, Rios GFA, Miranda WL, Neto PC (2011) Evapotranspiração de referência: uma abordagem atual de diferentes métodos de estimativa. Pesquisa Agropecuária Tropical 41(3):456–465. Available: http://www.scielo.br/pdf/pat/v41n3/a20v41n3.pdf. Accessed: Aug 1, 2016.
http://www.scielo.br/pdf/pat/v41n3/a20v4...
), were obtained at the Conventional Weather Station installed on the UFLA campus under monitoring of the National Institute of Meteorology. A kc of 0.8 proposed by Drumond et al. (2006)Drumond LCD, Zanini JR, Aguiar APA, Rodrigues GP, Fernandes ALT (2006) Produção de matéria seca em pastagem de Tifton 85 irrigada, com diferentes doses de dejeto líquido de suíno. Engenharia Agrícola 26(2):426–433. DOI: http://dx.doi.org/10.1590/S0100-69162006000200010
http://dx.doi.org/10.1590/S0100-69162006...
was adopted. The variations of temperature and relative humidity occurred during the experiment are shown in Figure 2. The water level applied to the soil columns was determined based on the water deficit obtained by the difference between ETc, precipitation and wastewater level applied (Figure 3).

FIGURE 2
Temperature and humidity variation that occurred during the experiment.
FIGURE 3
Distribution of rainfall and irrigation level that occurred during the experiment.

Three cuts of the Tifton 85 grass were made at 60, 90 and 120 days after transplanting to the soil columns. The cuts were carried out after each beginning of flowering at 5 cm of height.

After the collections, the Tifton 85 grass was sent to a greenhouse with forced air circulation at 65 °C for 72 h, followed by grinding in a Wiley type mill to quantify the dry matter yield and analyses of nutrient content of nitrogen, phosphorus, potassium, calcium, magnesium and sodium, according to Silva (2009)Silva FC (ed) (2009) Manual de análises químicas de solos, plantas e fertilizantes. Brasília, Embrapa Comunicação para Transferência de Tecnologia. 627p. methodology.

The experiment was set up in a completely randomized design (CRD) with three replicates. Soil data were submitted to analysis of variance using the F-Test at 0.05. In the statistical analysis, the computer program Sisvar 5.1 was used (Ferreira, 2011Ferreira DF (2011) Sisvar: a computer statistical analysis system. Ciência e Agrotecnologia 35(6):1039–1042. DOI: http://dx.doi.org/10.1590/S1413-70542011000600001
http://dx.doi.org/10.1590/S1413-70542011...
).

RESULTS AND DISCUSSION

Tifton 85 Grass Productivity

The dry matter yields of Tifton 85 grass are shown in Table 3. The control treatment AQT0, at the dosage of 30 kg ha−1 of N, 110 kg ha−1 of PT and 40 kg ha−1 of K, provided a dry matter yield of 10.06 t ha −1, being 277% higher than the yield of 3.62 t ha−1 obtained in the AAT1 treatment. This result may be related to the greater easiness of NPK assimilation by Tifton 85 grass in its initial stage. In the second cut, there was no statistical difference between the data, although maximum yields of 20.39 (AAT3) were observed, however after 116 days of monitoring, the highest SW dosage increased the yield of 19.26 06 t ha−1 (AAT4).

TABLE 3
Average productivity estimate, by cutting the Tifton 85 grass subjected to treatment with SW and AQT0.

According to Fontaneli et al. (2012)Fontaneli RS, Santos HP, Fontaneli RS (eds) (2012) Forrageiras para integração lavoura–pecuária – floresta na região sul-brasileira. Brasília, Embrapa., the dry matter yield of Tifton 85 grass can range from 8 to 20 t ha−1 year−1, depending on the level of fertility that is submitted. Matos et al. (2010)Matos AT, Abrahão SS, Lo Monacol PAV, Sarmento AP, Matos MP (2010) Capacidade extratora de plantas em sistemas alagados utilizados no tratamento de águas residuárias de laticínios. Revista Brasileira de Engenharia Agrícola e Ambiental 14:1311–1317. DOI: http://dx.doi.org/10.1590/S1415-43662010001200009
http://dx.doi.org/10.1590/S1415-43662010...
evaluated plant extractive capacity in constructed flooded systems and found an increase in dry matter productivity of Tifton 85 grass of 14.9 t ha−1 after receiving rates of 570 kg ha−1 d−1 of BOD from dairy wastewater.

The SW dosages applied, based on the nitrogen recommendation (Ribeiro et al., 1999Ribeiro AC, Guimarães PTG, Alvarez VH, (eds) (1999) Recomendações para o uso de corretivos e fertilizantes em Minas Gerais: 5. Aproximação. Viçosa, Comissão de Fertilidade do Solo do Estado de Minas Gerais. 359 p.), provided high concentrations of soluble salts in the soil solution, such as sodium, and the lower availability of essential nutrients such as phosphorus interfered in the productivities of the three cuts.

Extraction of nutrients by Tifton 85 grass

Tables 4, 5 and 6 show the average values of nitrogen, total phosphorus, potassium, sodium, calcium and magnesium extraction, based on the productivity and concentration of the dry matter of Tifton 85 grass in the three cuts.

TABLE 4
Average removal of nitrogen (TKN), total phosphorus (PT), potassium (K), sodium (Na) and calcium plus magnesium (Ca + Mg) by Tifton 85 in treatments with SW and AQT0 the first cut.
TABLE 5
Average removal of nitrogen (TKN), total phosphorus (PT), potassium (K), sodium (Na) and calcium plus magnesium (Ca + Mg) by Tifton 85 in treatments with SW and AQT0 the second cut.
TABLE 6
Average removal of nitrogen (TKN), total phosphorus (PT), potassium (K), sodium (Na) and calcium plus magnesium (Ca + Mg) by Tifton 85 in treatments with SW and AQT0 the third cut.

The extraction of macronutrients and sodium by Tifton 85 grass was influenced by the interaction between the different dosages of SW and the cuts. After the first cut, 60 days after planting, a statistical difference was observed between SW dosages and conventional chemical fertilization (AQT0), as seen in Table 4. The maximum extractions were obtained with the conventional chemical fertilization treatment (AQT0), being 169.16 kg ha−1 of TKN, 3.45 kg ha−1 of PT, 17.65 kg ha−1 of K, 27, 79 kg ha−1 of Ca + Mg and 2.68 kg ha−1 of Na.

In a study with constructed wetland systems (CWs), Fia et al. (2011)Fia FRL, Matos AT, Fia R, Lambert TF, Matos MP (2011) Remoção de nutrientes por Typha latifolia e Cynodon spp. cultivadas em sistemas alagados construídos. Ambi-Agua 6(1):77–89. DOI: http://dx.doi.org/10.4136/ambi-agua.175
http://dx.doi.org/10.4136/ambi-agua.175...
concluded that Tifton 85 grass removed about 450 kg ha−1 of TKN and 100 kg ha−1 of P in two cuts after 120 days of cultivation. Fia et al. (2014)Fia R, Boas RBV, Campos AT, Fia FRL, Souza EG (2014) Removal of nitrogen, phosphorus, copper and zinc from swine breeding wastewater by bermudagrass and cattail in constructed wetland systems. Engenharia Agrícola 34(1):112–113. DOI: http://dx.doi.org/10.1590/S0100-69162014000100013
http://dx.doi.org/10.1590/S0100-69162014...
found that Tifton 85 grass was able to extract between 9.8 and 17.6 kg ha−1 d−1 of TKN and between 0.6 and 1.7 kg ha−1 d−1 of PT, which represented 4.6 and 5.4% of the TKN and PT, respectively, contributed to the system.

The effect of the treatment with higher dose of SW (AAT4) provided in the second cut better performance of Tifton 85 grass in nutrient extraction, showing significant differences in relation to the effects of AQT0 treatment and maximum removals of 383.64 kg ha−1 of TKN and 10.35 kg ha−1 of total phosphorus (Table 5).

Serafim & Galbiatti (2012)Serafim RS, Galbiatti JA (2012) Efecto de la aplicación de la agua residual porcina en el pasto Brachiaria brizantha cv Marandu. Colombiana de Ciência Animal 4(1):185–203. Available: http://vufind.uniovi.es/Record/ir-ART0000486559/Details. Accessed: Aug 9, 2016.
http://vufind.uniovi.es/Record/ir-ART000...
when evaluated the production and chemical composition of Brachiaria brizantha cv Marandu fertilized with wastewater from pig farming, observed that the doses of 300 and 600 m3 ha−1 showed higher values of dry matter mass production. According to Abou-Elela et al. (2010)Abou-Elela SI, Kamel MM, Fawzy ME (2010) Biological treatment of saline wastewater using a salt-tolerant microorganism. Desalination 250(1):1–5., the capacity of sodium extraction by Tifton 85 grass can be considered high, since this chemical element is difficult to remove in wastewater treatment systems.

At 120 days after sowing, the reduction of nutritional extraction of Tifton 85 grass (Table 6) was observed in the third cut, with the maximum extractions being 234 kg ha−1 of TKN (AAT4), 7.9 kg ha−1 of PT (AAT3), 4.5 kg ha−1 of Na (AAT4) and 16.7 kg ha−1 of Ca + Mg (AAT4). These results represent a reduction in nutrient assimilation of 39% of TKN, 63% of PT and 58% of Ca + Mg when compared to the higher extractions in the second cut, although still higher in more than 200% in relation to the columns received AQT0.

The total extractions of the nitrogen (N), phosphorus (P) and potassium (K) macronutrients showed a quadratic behavior as a function of the nitrogen rates recommended for pasture (Ribeiro et al., 1999Ribeiro AC, Guimarães PTG, Alvarez VH, (eds) (1999) Recomendações para o uso de corretivos e fertilizantes em Minas Gerais: 5. Aproximação. Viçosa, Comissão de Fertilidade do Solo do Estado de Minas Gerais. 359 p.) applied by slaughterhouse wastewater (SW). Due to the adaptability of the Tifton 85 grass, the conditions of the soil columns, the extractions at 60 days after planting were 65.4 kg ha−1 of N, 0.6 kg ha−1 of P and 11.1 kg ha−1 of K (Figures 4A, 4B and 4C).

FIGURE 4
The total content of nitrogen (A), phosphorus (B) and potassium (C) in Tifton 85 grass taken from the three cycles of production in relation to the applied nitrogen doses by slaughterhouse wastewater (SW).

With the increase of nutrients by N rates and root development of Tifton 85 grass, higher extractions of N, P and K were observed in the second and third cuts, with maximum values of 384 and 10.3 kg ha−1 of N and P (AAT4), while the maximum potassium extraction was 117.7 kg ha−1 in the AAT3 treatment. According to Matos et al. (2009)Matos AT, Freitas WS, Lo Monaco PAV (2009) Capacidade extratora de diferentes espécies vegetais cultivadas em sistemas alagados utilizados no tratamento de águas residuárias da suinocultura. Ambiente & Água 4(2):31–45. DOI: http://dx.doi.org/10.4136/ambi-agua.84
http://dx.doi.org/10.4136/ambi-agua.84...
, the results of phosphorus and potassium extracted in this study are considered low, since the wastewater supply in the treatments was carried out based on the nitrogen nutritional need. Therefore, essential nutrients, such as phosphorus, may have been applied in doses lower than the necessary for the crop. Table 7 shows the equations of adjustment of the N, P and K extractions for each cut as a function of the doses.

TABLE 7
Adjustment equations of total extraction of nitrogen (N), phosphorus (P) and potassium (K) according to the doses of nitrogen applied via slaughterhouse wastewater (SW) for the three cuts made.

CONCLUSIONS

The use of slaughterhouse wastewater in the Tifton 85 grass can be considered as an alternative source of fertilizers for production and nutritional supply for animals.

The dosages of slaughterhouse wastewater provided higher increases in the productivity of the second and third cuts of Tifton 85 grass, with an average over 8 t ha−1.

The extractive capacity of Tifton 85 grass was intensified with the application of higher nutrient dosages, reaching 383.6, 10.35, 59.07, 1.62 and 39.75 kg ha−1 of N, P, K, Na and Ca + Mg, respectively.

There was a restriction of productivity in the third cut due to the reduction of the availability of essential nutrients and losses of nutrients by leaching.

ACKNOWLEDGEMENTS

We would lie to thank CAPES and FAMEPIG for the support and the availability of research grants and resources for the development of the project and the research.

REFERENCES

  • Abou-Elela SI, Kamel MM, Fawzy ME (2010) Biological treatment of saline wastewater using a salt-tolerant microorganism. Desalination 250(1):1–5.
  • Allen RG, Pereira LS, Raes D, Smith M (2006) Evapotranspiration del cultivo: guias para la determinación de los requerimientos de agua de los cultivos. FAO, 298p. (Paper, 56).
  • APHA - American Public Health Association, AWWA - American Water Works Association, WEF - Water Environment Federation. (2012) Standard methods for the examination of water and wastewater. 22 ed. Washington, 1496p.
  • Bedbabis S, Rouina BB, Boukhris M, Ferrara G (2014) Effect of irrigation with treated wastewater on soil chemical properties and infiltration rate. Journal of Environmental Management 133:45–50. DOI: http://dx.doi.org/10.1016/j.jenvman.2013.11.007
    » http://dx.doi.org/10.1016/j.jenvman.2013.11.007
  • Cabral JR, Freitas PSL, Rezende R, Muniz AS, Bertonha A (2011) Impacto da água residuária de suinocultura no solo e na produção de capim-elefante. Revista Brasileira de Engenharia Agrícola e Ambiental 15(8):823–831. DOI: http://dx.doi.org/10.1590/S1415-43662011000800009
    » http://dx.doi.org/10.1590/S1415-43662011000800009
  • Carvalho LG, Rios GFA, Miranda WL, Neto PC (2011) Evapotranspiração de referência: uma abordagem atual de diferentes métodos de estimativa. Pesquisa Agropecuária Tropical 41(3):456–465. Available: http://www.scielo.br/pdf/pat/v41n3/a20v41n3.pdf Accessed: Aug 1, 2016.
    » http://www.scielo.br/pdf/pat/v41n3/a20v41n3.pdf
  • Corrêa LA, Santos PM (2006) Irrigação de pastagens formadas por gramíneas forrageiras tropicais. São Carlos, Embrapa Pecuária Sudeste, 6p. (Comunicado Técnico, 48).
  • Drumond LCD, Zanini JR, Aguiar APA, Rodrigues GP, Fernandes ALT (2006) Produção de matéria seca em pastagem de Tifton 85 irrigada, com diferentes doses de dejeto líquido de suíno. Engenharia Agrícola 26(2):426–433. DOI: http://dx.doi.org/10.1590/S0100-69162006000200010
    » http://dx.doi.org/10.1590/S0100-69162006000200010
  • EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária (2013) Sistema brasileiro de classificação de solos. 3 ed. Rio de Janeiro, Centro Nacional de Pesquisa de Solos. 353p.
  • Ferreira DF (2011) Sisvar: a computer statistical analysis system. Ciência e Agrotecnologia 35(6):1039–1042. DOI: http://dx.doi.org/10.1590/S1413-70542011000600001
    » http://dx.doi.org/10.1590/S1413-70542011000600001
  • Fia FRL, Matos AT, Fia R, Lambert TF, Matos MP (2011) Remoção de nutrientes por Typha latifolia e Cynodon spp. cultivadas em sistemas alagados construídos. Ambi-Agua 6(1):77–89. DOI: http://dx.doi.org/10.4136/ambi-agua.175
    » http://dx.doi.org/10.4136/ambi-agua.175
  • Fia R, Boas RBV, Campos AT, Fia FRL, Souza EG (2014) Removal of nitrogen, phosphorus, copper and zinc from swine breeding wastewater by bermudagrass and cattail in constructed wetland systems. Engenharia Agrícola 34(1):112–113. DOI: http://dx.doi.org/10.1590/S0100-69162014000100013
    » http://dx.doi.org/10.1590/S0100-69162014000100013
  • Fia R, Matos AT, Fia FRL, Matos MP, Lamber TF, Nascimento FS (2010) Desempenho de forrageiras em sistemas alagados de tratamento de águas residuárias do processamento do café. Revista Brasileira de Engenharia Agrícola e Ambiental 14(8):842–847. DOI: http://dx.doi.org/10.1590/S1415-43662010000800008
    » http://dx.doi.org/10.1590/S1415-43662010000800008
  • Fontaneli RS, Santos HP, Fontaneli RS (eds) (2012) Forrageiras para integração lavoura–pecuária – floresta na região sul-brasileira. Brasília, Embrapa.
  • Gil I, Ulloa JJ (1997) Positive aspects of the use of water: the reuse of urban wastewater and its effect on areas of tourism. Mediterraneennes, 31:218–229. Available: http://agris.fao.org/aos/records/QC1997001469 Accessed: Aug 8, 2016.
    » http://agris.fao.org/aos/records/QC1997001469
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Publication Dates

  • Publication in this collection
    Jul-Aug 2017

History

  • Received
    06 Sept 2016
  • Accepted
    01 Mar 2017
Associação Brasileira de Engenharia Agrícola SBEA - Associação Brasileira de Engenharia Agrícola, Departamento de Engenharia e Ciências Exatas FCAV/UNESP, Prof. Paulo Donato Castellane, km 5, 14884.900 | Jaboticabal - SP, Tel./Fax: +55 16 3209 7619 - Jaboticabal - SP - Brazil
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