01925naa a2200229 a 450000100080000000500110000800800410001902200140006002400420007410000190011624501410013526000090027652012070028565000100149265000120150265000160151465000170153065000190154765000260156670000200159277300830161220523652016-09-28       2016    bl uuuu     u00u1 u    #d  a1807-86217 a10.4025/actasciagron.v38i4.308552DOI1 aLACERDA, M. C.  aEffects of row spacing and nitrogen topdressing fertilization on the yield of upland rice in a no-tillage system.h[electronic resource]  c2016  aThis study aimed to evaluate the effect of row spacing and nitrogen topdressing fertilization of two materials (genotype 07SEQCL441 CL and cultivar BRS Esmeralda) on the plant height, yield components, grain yield, and quality of an upland rice crop grown in a no-tillage system. Trials were conducted for two growing seasons under field conditions in a 3 x 4 factorial, randomized, complete block design, with four replications. For each material, treatments consisted of the combination of row spacing (0.225, 0.35, and 0.45 m) with nitrogen (N) applied as topdressing (0, 50, 100, and 150 kg ha-1). The lowest row spacing (0.225 m) for genotypes 07SEQCL441 CL and BRS Esmeralda provided a higher number of tillers, number of panicles m-2, and grain yield of rice. Increasing rates of N in the topdressing improved the rice grain yield for both cultivars, but for 07SEQCL441 CL, the grain yield was positively affected only to applications up to 50 kg N ha-1. Row spacing and N rates did not affect the rice grain quality. Therefore, these results indicate that the narrowest row spacing used (0.225 m) with N fertilization as topdressing increased the rice grain yield most in the no-tillage system.  aArroz  aCerrado  aNitrogênio  aOryza sativa  aPlantio direto  aPopulação de planta1 aNASCENTE, A. S.  tActa Scientiarum. Agronomy, Maringágv. 38, n. 4, p. 493-502, oct./dec. 2016.