02031naa a2200253 a 450000100080000000500110000800800410001902400390006010000190009924501040011826000090022252013040023165000160153565000090155165000100156065000210157065000100159165000140160165000170161565000140163265000100164670000220165677300990167820375072019-09-13       2015    bl uuuu     u00u1 u    #d7 a10.1080/00103624.2015.10335352DOI1 aFAGERIA, N. K.  aAgronomic evaluation of lowland rice genotypes for potassium-use efficiency.h[electronic resource]  c2015  aLowland rice is an important crop for humans, and information on potassium (K)?use efficiency for this crop is limited. A greenhouse experiment was conducted to evaluate agronomic characteristics of 12 lowland rice genotypes for K utilization. The K levels used were 0 mg kg−1 (low, natural level of soil) and 300 mg kg−1 (high). Plant height, straw yield, grain yield, panicle number, grain harvest index, 1000-grain weight, and spikelet sterility were significantly affected by K and genotypes treatments. The K × genotype interactions were significant for most of these growth, yield, and yield components, indicating that genotypes responded differently under two K rates. Furthermore, selection is possible for low as well as high K rates for lowland rice genotypes. Contribution of growth and yield components and agronomic efficiency in improving grain yield was in the order of agronomic efficiency &gt grain harvest index&gt 1000-grain weight &gt panicle number &gt shoot dry weight. There was significant decrease in soil K at harvest at low as well as at high K levels, indicating greater K requirements for lowland rice genotypes. Further, rice genotypes were significantly different in uptake and utilization of P, K, Al, and H+Al, as indicated by soil analysis at harvest.  aGrain yield  aRice  aRoots  aYield components  aArroz  aGenótipo  aOryza sativa  aPotássio  aRaíz1 aSANTOS, A. B. dos  tCommunications in Soil Science and Plant Analysis, New Yorkgv. 46, n. 11, p. 1327-1344, 2015.