01638naa a2200217 a 450000100080000000500110000800800410001902200140006002400380007410000190011224500550013126000090018652010360019565000100123165000170124165000140125870000160127270000230128870000170131177300920132819674092013-10-31       2013    bl uuuu     u00u1 u    #d  a0010-36247 a10.1080/00103624.2013.8130312DOI1 aFAGERIA, N. K.  aPotassium-use efficiency in upland rice genotypes.  c2013  aPotassium (K) uptake is greatest among essential nutrients for rice. Data related to yield, yield components, and K-use efficiency by upland rice genotypes are limited. A greenhouse experiment was conducted to evaluate influence of K on growth, yield and yield components, and K-use efficiency by upland rice genotypes. Potassium levels applied to an Oxisol were zero (natural K level) and 200 mg K kg1 of soil and 20 upland rice genotypes were evaluated. Plant height, shoot dry weight, grain yield, 1000-grain weight, and spikelet sterility were significantly affected by K and genotype treatments. Genotypes Primavera and BRA 1600 were the most efficient and genotype BRAMG Curinga was most inefficient in producing grain yield. Plant growth (plant height and shoot dry weight) and yield components (panicle number, grain harvest index, 1000-grain weight, and panicle length) were significantly and positively associated with grain yield. However, spikelet sterility was significantly and negatively correlated with grain yield.  aArroz  aOryza sativa  aPotássio1 aMOREIRA, A.1 aFERREIRA, E. P. B.1 aKNUPP, A. M.  tCommunications in Soil Science and Plant Analysis, New Yorkgv. 44, p. 2656-2665, 2013.