Methods For Quantify Nh3 Volatilizad From Soil Fertilizes With Urea
(Alves, Ana Carolina)
Methods for quantify NH3 volatilizad from soil fertilizes with ureaGaseous losses are considerable in pastures, therefore the utilizationof simple and accessible methods to measure them are extremelynecessary to evaluate the cycle of N in these systems. This work aimedto determine methods that quantify volatilized NH3 ofnitrogenous fertilizers applied to soil which have little interferentein the volatilization processes. Two experiments in a greenhouse fromDepartamento de Zootecnia of Faculdade de Zootecnia e Engenharia deAlimentos were conducted. Completely randomized experimental design wasused with five repetitions. Treatments from the first experiment were:foam absorber at 1, 10, 20 and 30 cm from the ground; paper absorber at1, 10, 20 and 30 cm from the ground; static semi-open collector and 15Nbalance (reference method). In the second experiment the treatmentsused were as follows: foam absorber at 1, 5, 10 and 20 cm from theground; paper absorber at 1, 5, 10 and 20 cm from the ground; acidabsorber at 1, 5 and 10 cm from the ground; static semi-open collectorand 15N balance (reference method). Both experiments quantified volatilized N ?NH3. N-NH3 losses determined by 15N balance method in experiment 1 were high (73% of the applied N) and none of the evaluated absorbers presented the same N-NH3 volatilization as the 15Nbalance. These results probably occurred due to the high pH value fromthe soil and the intense airflow generated by the greenhouse fans whatallowed the increase of N-NH3 volatilization and harmed itscapitation by the absorbers. In experiment 2, semi-open collector, foamabsorber at 1cm, paper absorbers at 1 and 5 cm and acid absorbers at 1;5 and 10 cm presented equal accumulated values of volatilized N-NH3 as 15N balance, therefore estimating the real N-NH3 accumulated losses (p<0,0001). Foam absorber at 1cm presented curves of N-NH3 losses similar to semi-open collector, considered the reference method to compare N-NH3 losses on each two days during the experimental period.
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