01748naa a2200289 a 450000100080000000500110000800800410001910000180006024501160007826000090019452009630020365000130116665000120117965000190119165000130121065000140122365000120123765000120124965000160126165000350127765000090131265300130132165300140133465300130134865300140136177300830137515462202010-01-20       1999    bl ---       0--  u    #d1 aSPEHAR, C. R.  aDiallel analysis for grain yield and mineral absorption rate of soybeans grown in acid Brazilian savannah soil.  c1999  aHigh available aluminium and low levels of calcium below the ploughed zone of the soil are limiting factors for agricultural sustainability in the Brazilian Cerrados (Savannahs). The mineral stresses compound with dry spells effect by preventing deep root growth of cultivated plants and causes yield instability. Tre mode of inheritance for grain yield and mineral absorption ratio of a diallel cross in soybeans [Glycine max (L) Merrill ]grown in high and low Al areas was identified. Differences among the genotypes for grain yield were more evident in the high Al, by grouping tolerant and non-tollerant genotypes for their respective arrays in the hybrids. A large proportion of genetic variance was additive for grain yield and mineral absorption ratio in both environments. High heritability values suggest that soybeans can be improved by crosses among Al-tolerant genotypes, using modified pedigree, early generation and recurrent selection schemes.  abreeding  acalcium  aplant breeding  asoybeans  aAlumínio  aCálcio  aCerrado  aGlycine Max  aMelhoramento Genético Vegetal  aSoja  aAdditive  aAluminium  aCultivar  aDominance  tPesquisa Agropecuaria Brasileira, Brasiliagv.34, n.6, p.1003-1009, jun. 1999.