02268naa a2200289 a 450000100080000000500110000800800410001902400540006010000190011424500970013326000090023052014070023965000180164665000280166465000140169265000090170665000100171565000140172565000170173965000140175665300220177065300220179265300270181470000220184170000210186377300940188411978382022-06-06       2010    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1080/00103624.2010.5178822DOI1 aFAGERIA, N. K.  aYield, potassium uptake, and use efficiency in upland rice genotypes.h[electronic resource]  c2010  aPotassium (K) is an essential nutrient for higher plants. Information on K uptake and use efficiency of upland rice under Brazilian conditions is limited. A greenhouse experiment was conducted with the objective to evaluate influence of K on yield, K uptake, and use efficiency of six upland rice genotypes grown on Brazilian Oxisol. The K rate used was zero (natural soil level) and 200 mg K kg?1 of soil. Shoot dry weight and grain yield were significantly influenced by K level and genotype treatments. However, K × genotype interactions were not significant, indicating similar responses of genotypes at two K levels for shoot dry weight and grain yield. Genotypes produced grain yield in the order of BRS Primavera &gt BRA 01596 &gt BRSMG Curinga &gt BRS 032033 &gt BRS Bonança &gt BRA 02582. Potassium concentration in shoot was about sixfold greater compared to grain, across two K levels and six genotypes. However, K utilization efficiency ratio (KUER) (mg shoot or grain yield / mg K uptake in shoot or root) was about 6.5 times greater in grain compared to shoot, across two K level and six genotypes. Potassium uptake in shoot and grain and KUER were significantly and positively associated with grain yield. Soil calcium (Ca), K, base saturation, acidity saturation, Ca saturation, K saturation, Ca/K ratio, and magnesium (Mg)/K ratio were significantly influenced by K application rate.  aHarvest index  aNutrient use efficiency  aPotassium  aRice  aArroz  aGenótipo  aOryza Sativa  aPotássio  aK uptake in grain  aK uptake in shoot  aK-use efficiency ratio1 aSANTOS, A. B. dos1 aMORAES, M. F. de  tCommunications in Soil Science and Plant Analysisgv. 41, n. 22, p. 2676-2684, Nov. 2010.