02093naa a2200265 a 450000100080000000500110000800800410001910000260006024501140008626000090020052013180020965000250152765000240155265000090157665000290158565000220161465000100163665000170164665000160166365000170167965000100169670000200170670000200172677300810174620543792017-03-07       2016    bl uuuu     u00u1 u    #d1 aCARVALHO, M. da C. S.  aFertilizers with coated urea in upland rice production and nitrogen apparent recovery.h[electronic resource]  c2016  aUrea is the most used N fertilizer for upland rice, however, a great percentage of N loss can occur with the use of this fertilizer. The use of products that provide reduction of N loss for urea fertilizers can contribute to increase N use efficiency. The objective of this study was to determine the effect of N rates applied in the form of coated urea in the content and accumulation of N in dry biomass, apparent recovery of nitrogen and grain yield of upland rice. The experimental design was a randomized complete blocks arranged in a 4 x 3 + 1 factorial scheme. The treatments consisted of four sources of N fertilizer [1. Common urea; 2. Polymer-coated urea for slow release of N (PCU); 3. urea with the urease inhibitor N-(n-Butyl) thiophosphoric triamide (NBPT); and 4. urea coated with copper sulfate and boric acid as urease inhibitors (UCCB)], with three fertilization rates (30, 60 and 90 kg ha-1 of N). In addition, we included a control treatment without N application. Coated urea did not provide increases in rice grain yield in relation to common urea. The increasing amount of N resulted in significant increases in rice grain yield (from 3217 to 5548 kg ha-1, 2010/11, and from 3392 to 4560 kg ha-1, 2011/12). The apparent nitrogen recovery rate decreased with the increase in N applied doses.  aNitrogen fertilizers  aPolymer-coated urea  aRice  aSlow-release fertilizers  aUrease inhibitors  aArroz  aFertilizante  aNitrogênio  aOryza sativa  aUreia1 aNASCENTE, A. S.1 aTEIXEIRA, P. C.  tBioscience Journal, Uberlândiagv. 32, n. 5, p. 1155-1164, Sept./Oct. 2016.