ABSTRACT
The aim of the present study was to qualify the biogas produced from poultry litter, cattle manure and swine manure, without the use of inoculants in prototype batch digesters. Each substrate had 5 replications (1 to 5) were randomly assigned to over 60 days were measured by detection equipment called portable gas Gas Alert ®. The biodigest measurements from B2 and S3 showed potentially toxic data on H2S (sulphuric acid) gas, with averages of 7.39 and 12.96 ppm. CO (carbon oxide) was high in poultry litter residue but very low at bovine and swine manure. CH4 (methane) was high in bovine and swine manure (Figure 1). No significant differences were found on replications at 0.5% significance on Tukey Test. Such results show the need to control and use gases as energy source or to another purpose, otherwise the biodigesting process can be harmful to human health. The Gas Alert equipment proved to be almost indispensable for routine use in studies which demands gas measurements and it was very useful in this biodigesting experiment, to forewarn toxic gas production in the system. The experiment also gagged methane gas production, as a legal determination for greenhouse gases monitoring during swine and poultry litter digesting, in order to use its gas as energy source and with it, minimizes the cost of its activity, as well as the sustainable benefits for environment.
O artigo não apresenta resumo em português.
ABSTRACT
The dairy cattle farming have a great importance on the economy and social aspects of São Paulo State. The parasites can reduce milk productivity, specially the cattle tick, Rhipicephalus (Boophilus) microplus. This work consisted on a survey on 40 dairy farms located in the Northeast region of São Paulo State. The principal objective of the quiz was to know how producers do the cattle tick control and about others parasites. 45% responded that the cattle tick is a problem in their properties and 65% were satisfied with the tick control, but only 17.5% know the biological cicle of this tick. The percentage of 29.5 was associated the hematologic diseases (anaplasmosis and babesiosis) with damages caused by the cattle tick, as well as 21.5% associated with the presence of screwworm (Cochliomiya hominivorax). The other responces about damages associated with the cattle tick were: weight loss (19.5%), milk loss (15.5%), mortality (12%) and transmission of others diseases (2%). The summer was the great response (88%) about the period of major tick incidence. The percentage of 87.5 of the surveyed applied acaricide with high frequency (7 to 30 days), but 50% apply selectively to the most infested cattle. The dairy workers (55%) and the owners (45%) apply the acaricide, always when they see tick infestation (92.5%) and the application is on all the animals body (87.5%) instead of par
O artigo não possui resumo em português.
ABSTRACT
Urea is the N source most widely used in pastures in Brazil. A significant amount of N is lost to the atmosphere by ammonia and nitrous oxide emissions and leached surface or ground water as nitrate contributing to environmental degradation such as the global warming or eutrophication. The loss of nitrogen by ammonia volatilization is a major factor for low efficiency of urea applied in soil surface. An alternative to reducing these losses is the use of urease inhibitors. The aim of this study was to investigate the effects of treating urea with urease inhibitor (NBPT N-(n-butyl) thiophosphoric acid triamide) on the dry biomass yield in pasture of Urochloa (syn. Brachiaria) brizantha Marandu to minimize NH3 volatilization. The study was performed at the Instituto de Zootecnia (IZ) at Nova Odessa, SP, Brazil, in a typic acrudox soil composed of sand (49.5%), clay (20.9%) and loam (29.6%). A randomized experimental design with three treatments and four replications was used. The treatments were: i) No N; ii) Urea; iii) Urea treated with urease inhibitor NBPT. The rate of N was 50 kg/ha applied to the surface of the soil. Measurements of NH3 volatilized were done by semiopen PVC chambers. Controls chambers were added to allow NH3 volatilized from unfertilised soil or contained in the air that swept over the soil surface. We evaluated the yield and plant height, SPAD value and N
O artigo não apresenta resumo em português.
ABSTRACT
The dairy cattle farming have a great importance on the economy and social aspects of the São Paulo Northeast region. The use of correct technologies, monitoring of the bovine cattle, financial and productive planning and the best application of disable resources can lead to a dairy activity more rentable to the farmers. The objective of this quiz was to evaluate majorly the situation of pastures in to farmer profile, property characteristics, herd characteristics, area of grasslands and forage species, employed fertilization and adopted management system inside or not CATI Milk project. CATI Milk is a project of technical assistance and rural extension, which aims to develop the milk production chain (including improvement in herd management and grazing). This work consisted on appliance of a 97 questions quiz given to 40 dairy farmers from the São Paulo Northeast region, Brazil, where 20 farmers were part of the CATI Milk project and other 20 farmers were not. Pastures with up to 32.5 ha comprise 75% of the studied properties (77.5%), Urochloa (sin. Brachiaria) was the predominant forage (46%), followed by Megathyrsus (sin. Panicum) 41.5% of pasture. The older age of pastures (> 6 years) were predominant (54%), while those grazing 3-6 years represented 15% and younger than 3 years, 31%. It was found that (Urochloa decumbens and Urochloa Marandu, Xaraés, MG-4, MG-5 and Piat
O artigo não apresenta resumo em português.
ABSTRACT
The dairy cattle farming have a great importance on the economy and social aspects of the São Paulo Northeast region. The use of correct technologies, monitoring of the bovine cattle, financial and productive planning and the best application of disable resources can lead to a dairy activity more rentable to the farmers. The objective of this quiz was to evaluate majorly the situation of pastures in to farmer profile, property characteristics, herd characteristics, area of grasslands and forage species, employed fertilization and adopted management system inside or not CATI Milk project. CATI Milk is a project of technical assistance and rural extension, which aims to develop the milk production chain (including improvement in herd management and grazing). This work consisted on appliance of a 97 questions quiz given to 40 dairy farmers from the São Paulo Northeast region, Brazil, where 20 farmers were part of the CATI Milk project and other 20 farmers were not. Pastures with up to 32.5 ha comprise 75% of the studied properties (77.5%), Urochloa (sin. Brachiaria) was the predominant forage (46%), followed by Megathyrsus (sin. Panicum) 41.5% of pasture. The older age of pastures (> 6 years) were predominant (54%), while those grazing 3-6 years represented 15% and younger than 3 years, 31%. It was found that (Urochloa decumbens and Urochloa Marandu, Xaraés, MG-4, MG-5 and Piat
O artigo não apresenta resumo em português.
ABSTRACT
Urea is the N source most widely used in pastures in Brazil. A significant amount of N is lost to the atmosphere by ammonia and nitrous oxide emissions and leached surface or ground water as nitrate contributing to environmental degradation such as the global warming or eutrophication. The loss of nitrogen by ammonia volatilization is a major factor for low efficiency of urea applied in soil surface. An alternative to reducing these losses is the use of urease inhibitors. The aim of this study was to investigate the effects of treating urea with urease inhibitor (NBPT N-(n-butyl) thiophosphoric acid triamide) on the dry biomass yield in pasture of Urochloa (syn. Brachiaria) brizantha Marandu to minimize NH3 volatilization. The study was performed at the Instituto de Zootecnia (IZ) at Nova Odessa, SP, Brazil, in a typic acrudox soil composed of sand (49.5%), clay (20.9%) and loam (29.6%). A randomized experimental design with three treatments and four replications was used. The treatments were: i) No N; ii) Urea; iii) Urea treated with urease inhibitor NBPT. The rate of N was 50 kg/ha applied to the surface of the soil. Measurements of NH3 volatilized were done by semiopen PVC chambers. Controls chambers were added to allow NH3 volatilized from unfertilised soil or contained in the air that swept over the soil surface. We evaluated the yield and plant height, SPAD value and N
O artigo não apresenta resumo em português.
ABSTRACT
The dairy cattle farming have a great importance on the economy and social aspects of São Paulo State. The parasites can reduce milk productivity, specially the cattle tick, Rhipicephalus (Boophilus) microplus. This work consisted on a survey on 40 dairy farms located in the Northeast region of São Paulo State. The principal objective of the quiz was to know how producers do the cattle tick control and about others parasites. 45% responded that the cattle tick is a problem in their properties and 65% were satisfied with the tick control, but only 17.5% know the biological cicle of this tick. The percentage of 29.5 was associated the hematologic diseases (anaplasmosis and babesiosis) with damages caused by the cattle tick, as well as 21.5% associated with the presence of screwworm (Cochliomiya hominivorax). The other responces about damages associated with the cattle tick were: weight loss (19.5%), milk loss (15.5%), mortality (12%) and transmission of others diseases (2%). The summer was the great response (88%) about the period of major tick incidence. The percentage of 87.5 of the surveyed applied acaricide with high frequency (7 to 30 days), but 50% apply selectively to the most infested cattle. The dairy workers (55%) and the owners (45%) apply the acaricide, always when they see tick infestation (92.5%) and the application is on all the animals body (87.5%) instead of par
O artigo não possui resumo em português.
ABSTRACT
The aim of the present study was to qualify the biogas produced from poultry litter, cattle manure and swine manure, without the use of inoculants in prototype batch digesters. Each substrate had 5 replications (1 to 5) were randomly assigned to over 60 days were measured by detection equipment called portable gas Gas Alert ®. The biodigest measurements from B2 and S3 showed potentially toxic data on H2S (sulphuric acid) gas, with averages of 7.39 and 12.96 ppm. CO (carbon oxide) was high in poultry litter residue but very low at bovine and swine manure. CH4 (methane) was high in bovine and swine manure (Figure 1). No significant differences were found on replications at 0.5% significance on Tukey Test. Such results show the need to control and use gases as energy source or to another purpose, otherwise the biodigesting process can be harmful to human health. The Gas Alert equipment proved to be almost indispensable for routine use in studies which demands gas measurements and it was very useful in this biodigesting experiment, to forewarn toxic gas production in the system. The experiment also gagged methane gas production, as a legal determination for greenhouse gases monitoring during swine and poultry litter digesting, in order to use its gas as energy source and with it, minimizes the cost of its activity, as well as the sustainable benefits for environment.
O artigo não apresenta resumo em português.
ABSTRACT
One of the major limitations for pastures high production is the low fertility of tropical soils. In general, the nutrient reposition through chemical fertilizers increases the cost of production and can unbalance the plant besides the environment pollution. Recycling solid residues from agribusiness is a sustainable alternative for farmers. Among the residues, the poultry litter (PL) aerobically fermented is a very good bio fertilizer for pastures. The Piatã Grass (Brachiaria brizantha) is a new option for the pasture market and can be used for bovine, equine or ovine. The fast diagnosis of the nutritional stage of this plant, based upon portable methods as the Dualex, measuring leaf light reflectance is a practical alternative. By this way, it is possible to offer to the herd high nutritional food, correcting eventual shortage, mainly nitrogen. Nitrogen nutrition is directely related to chlorophyll content in the leaf blade. This study aimed to verify the effects of doses of PL over total chlorophyll, in comparison to two methods of evaluation: Dualex Scientific 4.0 and Spectrophotometer Analysis according to Lichtenthaler & Wellburn (1983). The experiment was conducted in greenhouse conditions, at IZ, Nova Odessa, with a Haplortox soil, between May and July, 2013. Treatments consisted of five compost doses (PL): 0, 20, 40, 60 and 120 Mg ha-1, with the following chemica
O artigo não apresenta resumo em português.
ABSTRACT
One of the major limitations for pastures high production is the low fertility of tropical soils. In general, the nutrient reposition through chemical fertilizers increases the cost of production and can unbalance the plant besides the environment pollution. Recycling solid residues from agribusiness is a sustainable alternative for farmers. Among the residues, the poultry litter (PL) aerobically fermented is a very good bio fertilizer for pastures. The Piatã Grass (Brachiaria brizantha) is a new option for the pasture market and can be used for bovine, equine or ovine. The fast diagnosis of the nutritional stage of this plant, based upon portable methods as the Dualex, measuring leaf light reflectance is a practical alternative. By this way, it is possible to offer to the herd high nutritional food, correcting eventual shortage, mainly nitrogen. Nitrogen nutrition is directely related to chlorophyll content in the leaf blade. This study aimed to verify the effects of doses of PL over total chlorophyll, in comparison to two methods of evaluation: Dualex Scientific 4.0 and Spectrophotometer Analysis according to Lichtenthaler & Wellburn (1983). The experiment was conducted in greenhouse conditions, at IZ, Nova Odessa, with a Haplortox soil, between May and July, 2013. Treatments consisted of five compost doses (PL): 0, 20, 40, 60 and 120 Mg ha-1, with the following chemica
O artigo não apresenta resumo em português.
ABSTRACT
Low availability of nitrogen (N) is a factor that limits forage production. Pastures are mostly formed of grasses, which need large N amounts to sustain high yields. Additionally, the availability of this nutrient affects the persistence and quality of the forage produced. However, when applying fertilizers containing nitrogen up to 50% can be lost, making their use costly for farmers. N is a highly volatile gas, and urea, widely used in agriculture, contains 46% N. When urea comes in contact with moisture in the soil, hydrolysis occurs due to the precipitation of the enzyme urease, accelerating the transformation of urea into ammonia, which can be lost by volatilization. One of the techniques to increase the efficiency of using urea is application of nitrogen fertilizers along with urease inhibitors, to retard the breakdown of urea so that it becomes incorporated in the soil slowly. One of the inhibitors used is N-(n-butyl) phosphate triamide (NBPT). This study aimed to assess the effect of nitrogen sources and doses on some productive characteristics of Áries grass (Panicum maximum, Jacq) to find ways to improve the effectiveness of nitrogen application. The tests were performed at Centro Nutrição Animal e Pastagens Instituto de Zootecnia in Nova Odessa, São Paulo, from March to August 2012. The experimental design was randomized blocks, with five replications in 2 x 3 fact
O artigo não apresenta resumo em português.
ABSTRACT
In 2012, Brazil produced 12.6 million metric tons of chicken meat, generating 10.3 tons of poultry litter. Compost made from such organic waste can be used as a low-cost bio fertilizer, especially as nitrogen and phosphorus source. The compost can increase pastures quality by giving photosynthetic improvement and altering amounts of chlorophyll and flavonoids. There is little information about the relationship between chlorophyll a or b and flavonoids in Brachiaria brizantha Piata. The flavonoid is a kind of polyphenol compound which protects the plant against UV-B radiation and pathogen attack, it acts as attractants for pollinators, as signal molecules for initiating plant-microbe symbiotic associations and antioxidant activity. The objective of the present study was verified the effects of poultry litter compost doses on the chlorophyll and flavonoid contents in Piata grass leaves. The experiment was performed at the Animal Nutrition and Pasture Center Instituto de Zootecnia Nova Odessa, SP, from May to July 2013, on a Haplorthox soil (pHCaCl2= 4.9), cultivated with Piata grass (Brachiaria brizantha, Stapf), without liming. The treatments consisted of five compost doses: 0; 20; 40; 60 and 120 Mg ha-1, with the following chemical composition (%): 2.88 of N, 3.85 of P2O5, 2.50 of K2O, 9.06 of Ca and 1.16 of Mg. The experimental design was on randomized blocks with five re
O artigo não apresenta resumo em português.
ABSTRACT
Composting is a controlled aerobic process to treat and stabilize organic wastes, transforming them into organic fertilizers. It is environmentally friendly (by treating polluting wastes and recycling nutrients and materials), sanitary (by breaking the cycle of diseases and eliminating vectors) and socially beneficial (by generating jobs and improving crop yields). The use of compost from urban waste (the product obtained by composting the organic part of solid household wastes) can improve soil fertility without harming the environment. This study aimed to evaluate the effect of levels of organic fertilizer (waste compost - WC) on soil macronutrient contents. The experiment was performed at the Animal Nutrition and Pasture Center Instituto de Zootecnia Nova Odessa, SP, between January and June 2013, in a Haplorthox soil (pHCaCl2= 4.9), cultivated with piatagrass (Brachiaria brizantha, Stapf), without liming. The treatments involved five rates of WC application: 0, 2.0, 4.0, 6.0, 8.0 and 10.0 Mg ha-1, mixed with soil before sowing the grass. The experimental design was randomized blocks, with five replications, in pottery vessels (3.34 dm3). Soil samples were collected prior to the experiment (original soil) and after cultivation of the grass (60 days after application). The samples were air dried and passed through sieves with 2 mm mesh and analyzed chemically. The macronu
O artigo não apresenta resumo em português.
ABSTRACT
Composting is a controlled aerobic process to treat and stabilize organic wastes, transforming them into organic fertilizers. It is environmentally friendly (by treating polluting wastes and recycling nutrients and materials), sanitary (by breaking the cycle of diseases and eliminating vectors) and socially beneficial (by generating jobs and improving crop yields). The use of compost from urban waste (the product obtained by composting the organic part of solid household wastes) can improve soil fertility without harming the environment. This study aimed to evaluate the effect of levels of organic fertilizer (waste compost - WC) on soil macronutrient contents. The experiment was performed at the Animal Nutrition and Pasture Center Instituto de Zootecnia Nova Odessa, SP, between January and June 2013, in a Haplorthox soil (pHCaCl2= 4.9), cultivated with piatagrass (Brachiaria brizantha, Stapf), without liming. The treatments involved five rates of WC application: 0, 2.0, 4.0, 6.0, 8.0 and 10.0 Mg ha-1, mixed with soil before sowing the grass. The experimental design was randomized blocks, with five replications, in pottery vessels (3.34 dm3). Soil samples were collected prior to the experiment (original soil) and after cultivation of the grass (60 days after application). The samples were air dried and passed through sieves with 2 mm mesh and analyzed chemically. The macronu
O artigo não apresenta resumo em português.
ABSTRACT
In 2012, Brazil produced 12.6 million metric tons of chicken meat, generating 10.3 tons of poultry litter. Compost made from such organic waste can be used as a low-cost bio fertilizer, especially as nitrogen and phosphorus source. The compost can increase pastures quality by giving photosynthetic improvement and altering amounts of chlorophyll and flavonoids. There is little information about the relationship between chlorophyll a or b and flavonoids in Brachiaria brizantha Piata. The flavonoid is a kind of polyphenol compound which protects the plant against UV-B radiation and pathogen attack, it acts as attractants for pollinators, as signal molecules for initiating plant-microbe symbiotic associations and antioxidant activity. The objective of the present study was verified the effects of poultry litter compost doses on the chlorophyll and flavonoid contents in Piata grass leaves. The experiment was performed at the Animal Nutrition and Pasture Center Instituto de Zootecnia Nova Odessa, SP, from May to July 2013, on a Haplorthox soil (pHCaCl2= 4.9), cultivated with Piata grass (Brachiaria brizantha, Stapf), without liming. The treatments consisted of five compost doses: 0; 20; 40; 60 and 120 Mg ha-1, with the following chemical composition (%): 2.88 of N, 3.85 of P2O5, 2.50 of K2O, 9.06 of Ca and 1.16 of Mg. The experimental design was on randomized blocks with five re
O artigo não apresenta resumo em português.
ABSTRACT
Low availability of nitrogen (N) is a factor that limits forage production. Pastures are mostly formed of grasses, which need large N amounts to sustain high yields. Additionally, the availability of this nutrient affects the persistence and quality of the forage produced. However, when applying fertilizers containing nitrogen up to 50% can be lost, making their use costly for farmers. N is a highly volatile gas, and urea, widely used in agriculture, contains 46% N. When urea comes in contact with moisture in the soil, hydrolysis occurs due to the precipitation of the enzyme urease, accelerating the transformation of urea into ammonia, which can be lost by volatilization. One of the techniques to increase the efficiency of using urea is application of nitrogen fertilizers along with urease inhibitors, to retard the breakdown of urea so that it becomes incorporated in the soil slowly. One of the inhibitors used is N-(n-butyl) phosphate triamide (NBPT). This study aimed to assess the effect of nitrogen sources and doses on some productive characteristics of Áries grass (Panicum maximum, Jacq) to find ways to improve the effectiveness of nitrogen application. The tests were performed at Centro Nutrição Animal e Pastagens Instituto de Zootecnia in Nova Odessa, São Paulo, from March to August 2012. The experimental design was randomized blocks, with five replications in 2 x 3 fact
O artigo não apresenta resumo em português.
ABSTRACT
The N management on pasture requires methods for analyzing and predicting the need for fertilization, aiming at greater efficiency of fertilizer application, adjusting the forage requirements for biomass productivity with quality and sustainability. Nitrogen Nutrition Index (NNI) defined as the ratio between the actual N concentration and the N concentration critical, corresponding to the actual standing biomass. NNI is an indicator well connected with the physiological regulation of N concentration, but it cannot be used directly in farm conditions. Leaf N concentration has been shown to be with greenness (chlorophyll meter readings), as measured by SPAD 502, giving instantaneous values that could be used for estimating directly the N concentration and indirectly the NNI. The main of this work was to test the usefulness N concentration and SPAD to diagnose the N status of four genotypes Urochloa. The experimental design was a randomized block in a factorial 4 x 4, genotypes of Urochloa (U. brizantha cv. Piata, U. brizantha cv. Marandu, and two hybrids H69 and H12) and nitrogen levels (0, 75, 150 and 225 mg dm-3) whose source urea, with five replications, in pots (3.34 dm3) with Psament soil. Evaluations were performed on plants aged 52 days after sowing. Data were analyzed by the mixed procedure of SAS V. 9.2; average qualitative treatments were compared by Tukey test at 5% pr
O artigo não apresenta resumo em português.
ABSTRACT
The use of legumes in animal production systems can be a sustainable alternative as a protein source in rotational grazing system and/or as a protein bank. Pigeon pea (Cajanus cajan (L.) Millsp.) figure as an example of success of this use on animal nutrition. The development of this species can be limited by the high acidity and low soil phosphorus content. There is a lack of scientific information on the effects of liming and phosphorus fertilization on some nutritional variables of two pigeon pea new hybrids. This study was conducted in pots containing 5 kg of soil in a greenhouse at the Instituto de Zootecnia, Nova Odessa, São Paulo State. There were studied two pigeon pea hybrids, H1 and H2, and the treatments involved agronomic practices: 1) No liming and without phosphorus (control), 2) Liming (L), 3) Phosphorus fertilization (P) and 4) Liming plus phosphorus. Liming was proposed to increase soil base saturation to 50%, it was used dolomite lime PRNT = 90%, in an amount corresponding to 4.5 t/ha. Phosphorus fertilization (as superphosphate) rate was 60 kg/ha of PO25. The experimental units were allocated according to a complete randomised block design, with five replications. We analyzed the levels of crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), in pigeon pea shoot at 45 days of age. Statistical analyzes were performed using the software
O artigo não apresenta resumo em português.
ABSTRACT
The management of nitrogen supply (N) is a very important issue concerned to plant growth and the environment healthy. For farmers, to know how much N the plant requires enables the application of appropriate amounts of nitrogen fertilizer, maximizing the use of this material. The availability of N has been identified as one of the main limiting factors, but also a management tool in the production of grasses. The nitrogen in the soil either, as a constituent of organic matter or in the mineral form (ammonium and nitrate), has a limited supply and can be depleted rapidly in a few crops. The aim of this study was to evaluate the effects of sources and nitrogen levels in four genotypes of Brachiaria (Brachiaria brizantha cv. Marandu, Brachiaria brizantha cv. Piata and two interspecific hybrids of Brachiaria spp) on the total and the leaf dry matter production, leaf percentage and leaf: stem ratio. The soil was an Psament-Entisol, coming from a pasture of Brachiaria decumbens with low organic matter content. The experiment was conducted in greenhouse, in Nova Odessa, Sao Paulo, from October 2009 to April 2010. The experimental design was in randomized complete blocks and the treatments were arranged in a factorial 4 x 2 x 4, four genotypes of Brachiaria , two N sources (urea and ammonium nitrate) and four nitrogen rates (0, 75, 150 or 225 mg dm-3) with five replicates, totaling 16
O artigo não apresenta resumo em português.
ABSTRACT
The low availability of nitrogen (N) is considered one of the most limiting factors for the productivity of pastures, often responsible for their degradation. Overall, due to the high cost of nitrogen fertilizers, it is not applied in sufficient quantities. In this context, the cultivation of legumes is an option for adding nitrogen in the soil and simultaneously is into high-protein food. Forage legume may reduce the emission of greenhouse gases, changing nutrient cycling (C and N) and can improve productivity and sustainability of agricultural systems. Most of the N in the soil is in the organic form compounds, that is converted into inorganic fraction, the predominant mineral forms of nitrogen (NH4+ and NO3-), available to plants by mineralization process. The C:N ratios from soil and plant residues affect the decomposition rate and the balance between N mineralization and N immobilization by microbes. The aim of this study was to evaluate the improvements in soil quality by comparing the forage legume Arachis pintoi cv. Belmonte, cultivated for eight years and a bare soil - an adjacent area (AA) in a soil Ultissol (Red Dysthrophic argisol). We evaluated the levels and stocks of C, total N and C:N, NH4+ and NO3- in soil from a depth of 0-20 cm. The experimental design was a randomized complete block with ten replications. Variance analysis (ANOVA) was used to detect signific
O artigo não apresenta resumo em português.