<![CDATA[The research was aimed at investigating the effect of natural zeolite of Taskmalayan deposit and urea fertilizer on ammonia (NH3) emission, nitrogen uptake and rice yield. The researh was a pot experiment using Eutrudept soil type conducted in a green house in the Agriculture Faculty, Jenderal Soedirman University. The experiment was factorially arranged in a randomized block design. The factors were composed of three levels of natural zeolite (equivalent to 0, 1000 and 2000 kg/ha, respectively) and two types of urea fertilizers with levels equivalent to 0, 100, 200 kg N prilled urea/ha and 0, 100, 200 kg N supergranule urea/ha, respectively. Ammonia emmited was determined using Sulfuric Acid Entrapment System, whereby each experimental pot was covered with a transparent plastic chamber into which N-free air was transferred. NH3 emitted was trapped in by dilute sulfuric acid solution. The results of the experiment indicated that application of natural zeolite could reduce N volatilized by 46 %, from 78,78 to 42,11 mg N/pot. The highest N volatilized was observed at the application of prilled urea at 200 kg N/ha (197.23 mg/pot). The applications of natural zeolite did not significantly affect nitrogen uptake by rice plants.Keywords : Zeolite, ammonia emission, rice]]>
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