02327naa a2200385 a 450000100080000000500110000800800410001910000160006024500650007626000090014152013650015065000140151565000120152965000130154165000160155465000140157065000110158465000190159565000140161465000160162865000180164465000140166265000150167665000090169165000160170065000140171665300140173065300210174465300170176565300090178270000240179170000190181570000230183477300840185714448632024-03-21       2000    bl uuuu     u00u1 u    #d1 aLIMA, W. F.  aStability of soybean yield through different sowing periods.  c2000  aSoybean yield is highly affected by sowing period and there are significant productivity losses when sowings are done outward a relatively restricted period in many regions of Brazil. Breeding cultivars less sensitive to photoperiod and to temperature variations is desirable for adaptation to wider sowing period and wider latitude range and also make irrigated soybean cultivation possible during the fall-winter seasons in frost free regions. The possibility of selecting high yielding and stable lines for yield during various sowing periods wasstudied by analyzing the behavior of 100 non-selected advanced lines (F9 and F10), from each one of all possible biparental crosses involving the genotypes BR85-29009, OCEPAR 8, FT-2, and BR-13. Experiments were set up in a completely randomized design with single-plant hill plots and received supplementary irrigation. Sowing was on Sept 27, Oct 20, Nov 17, and Dec 17 in 1993/94 and Sept 20, Oct 20, Nov 17, and Dec 14 in 1994/95 at Londrina, PR, Brazil. Procedures of regression analysis and minimum variance among planting date means were efficient for selecting stable lines during the four sowing seasons. It was possible to select stable and high yielding genotypes through the four sowing periods in all the crosses. No specific cross was clearly better to produce a greater number of stable genotypes.  aCultivars  aProgeny  aSoybeans  aTemperature  avarieties  aYields  aFotoperiodismo  aGenótipo  aGlycine Max  aProdutividade  aProgênie  aRendimento  aSoja  aTemperatura  aVariedade  aGenotypes  aPhotoperiodicity  aProductivity  aSoys1 aTOLEDO, J. F. F. de1 aARIAS, C. A. A1 aOLIVEIRA, M. F. de  tPesquisa Agropecuaria Brasileira, Brasiliagv.35, n.11, p.2181-2189, nov. 2000.