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“…sommer & ersbøll (1996) used a sigmoid model to relate the cumulative nH 3 -n volatilization from urea to the time after application, showing that in clay soil, half of the total losses can occur between 2 and 7 days after n fertilizer application. despite the underestimation of volatilization for the initial stages (0-6 days), the amount of volatilized nH 3 -n in the oC system did differ from that in the soC (figure 4a); soCs are considered to provide reliable estimates of the process due to the calibration of the system with 15 n. in a greenhouse experiment, Alves et al (2011) observed no differences between a soC and an oC in the quantification of nH 3 -n volatilized from soil. the estimates of mean nH 3 -n volatilization in relation to urea-n considering all rates (figure 4b) were 22.0 % ± 4.7 and 13.9 % ± 7.2 for the soC and oC, respectively.…”
Section: Methodsmentioning
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“…sommer & ersbøll (1996) used a sigmoid model to relate the cumulative nH 3 -n volatilization from urea to the time after application, showing that in clay soil, half of the total losses can occur between 2 and 7 days after n fertilizer application. despite the underestimation of volatilization for the initial stages (0-6 days), the amount of volatilized nH 3 -n in the oC system did differ from that in the soC (figure 4a); soCs are considered to provide reliable estimates of the process due to the calibration of the system with 15 n. in a greenhouse experiment, Alves et al (2011) observed no differences between a soC and an oC in the quantification of nH 3 -n volatilized from soil. the estimates of mean nH 3 -n volatilization in relation to urea-n considering all rates (figure 4b) were 22.0 % ± 4.7 and 13.9 % ± 7.2 for the soC and oC, respectively.…”
Section: Methodsmentioning
“…therefore, the urea was exposed to the same climatic conditions as in the remaining experimental plots. the oC, modified according to Alves et al (2011), consisted of a 16 x 16 x 0.2 cm rigid pVC plate (figure 1b). An nH 3 absorber consisting of polyethylene foam, identical to that used in the soC (diameter 14.4 cm, thickness 2 cm and density 0.02 g cm -3 ), was fixed to the underside of the plate.…”
Section: Methodsmentioning
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“…Costa et al (2003), ao estudarem a volatilização de fontes nitrogenadas em cana-de-açúcar, em condições de campo, com colheita mecânica sem queima, registraram que as perdas ocorreram até os seis primeiros dias após a aplicação dos fertilizantes, em que a ureia, a ureia com adição de sulfato de amônio, o uran e um resíduo líquido enriquecido com nitrogênio apresentaram 36; 35; 15; e 9% de perdas, respectivamente. Alves et al (2011) também relataram pico de volatilização para ureia no sexto dia, com as perdas mais expressivas entre o quarto e o décimo dia.…”
Section: Resultsunclassified
“…Ammonia volatilization was assessed until 20 days after fertilizer application (Cantarella et al, 2008;Alves et al, 2011;Faria et al, 2013;Nascimento et al, 2013). The foams were replaced 2, 4, 6, 9 13, and 17 days after fertilization and stored in plastic bags at -4 o C for later extraction and analysis (Alves et al, 2007 The amount of NH 3 volatilized from the soil was assessed simultaneously in a control (without N) under the same experimental conditions to generate data underlying the calculations of NH 3 volatilized from fertilizer.…”
Section: Methodsmentioning