1999
DOI: 10.1080/00103629909370211
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Calibration of a semi‐open static collector for determination of ammonia volatilization from nitrogen fertilizers

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Cited by 69 publications
(79 citation statements)
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“…Subsequently, the results were corrected according to the equations proposed by Lara Cabezas et al (1999). The daily and accumulated volatilization rates were calculated as the sum of daily losses.…”
Section: Methodsmentioning
confidence: 99%
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“…Subsequently, the results were corrected according to the equations proposed by Lara Cabezas et al (1999). The daily and accumulated volatilization rates were calculated as the sum of daily losses.…”
Section: Methodsmentioning
confidence: 99%
“…To estimate N losses by ammonia volatilization from soil after N fertilization, we used the direct method with semi-open collectors (Nômmik, 1973) in a dynamic mode, i.e., changing the chamber of the collectors to the subsequent bases (PVC rings by which collectors are fixed to the ground) and the integration of correction factors proposed by Lara Cabezas et al (1999). At each base, 15 g of N was applied in the fertilizer forms under study, in an amount proportional to the diameter of the collectors (15 cm).…”
Section: Methodsmentioning
confidence: 99%
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“…The rate of ammonia volatilization was determined by a semi-open static collector adapted from the methods described by Lara-Cabezas (1999). Polyvinyl chloride tubes (20 cm in diameter and 50 cm long) were inserted in the soil at a depth of 5 cm under the tree canopy (0.35 m from plagiotropic branches).…”
Section: Methodsmentioning
confidence: 99%
“…The volatilization losses (C 18 ) in the form of NH 3 from the fertilizer (ammonium sulfate), although expected to be minimal in a low pH soil, were evaluated by integrating information from static semi-open ammonia collectors over time (Lara-Cabezas et al, 1999). To evaluate the re-absorption of volatilized fertilizer ammonia by plants (Fenilli et al, 2007a) soil trays (0.05 x 0.4 x 0.7 m) filled with soil of the 0-0.15 m layer were placed under the plant canopy containing 15 N-labeled fertilizer.…”
Section: Fieldmentioning
confidence: 99%