02204naa a2200229 a 450000100080000000500110000800800410001902200140006002400380007410000190011224500960013126000090022752015310023665000190176765000240178665000070181065000090181770000160182670000150184270000180185777300990187519699862013-10-31       2013    bl uuuu     u00u1 u    #d  a0010-36247 a10.1080/00103624.2013.8294842DOI1 aFAGERIA, N. K.  aOptimal acidity indices for soybean production in brazilian oxisols.h[electronic resource]  c2013  aSoybean is an important crop for the Brazilian economy, and soil acidity is one of the main yield-limiting factors in Brazilian Oxisols. A field experiment was conducted during three consecutive years with the objective to determine soybean response to liming grown on Oxisols. Liming rates used were 0, 3, 6, 12, and 18 Mg ha−1. Liming significantly increased grain yield in a quadratic trend. Ninety percent maximum economic grain yield (2900 kg ha−1) was achieved with the application of about 6 Mg lime ha−1. Shoot dry weight, number of pods per plant, and 100-grain weight were also increased significantly in a quadratic fashion with increasing liming rate from 0 to 18 Mg ha−1. These growth and yield components had a significant positive association with grain yield. Maximum contribution in increasing grain yield was of number of pods per plant followed by grain harvest index and shoot dry weight. Uptake of nitrogen (N) was greatest and phosphorus (P) was least among macronutrients in soybean plant. Nutrient-use efficiency (kg grain per kg nutrient accumulation in grain) was maximum for magnesium (Mg) and lowest for N among macronutrients. Application of 3 Mg lime ha−1 neutralized all aluminum ions in soil solution. Optimal acidity indices for 90% of maximum yield were pH 6.0, calcium (Ca) 1.6 cmolc kg−1, Mg 0.9 cmolc kg−1, base saturation 51%, cation exchange capacity (CEC) 4.8 cmolc kg−1, Ca/Mg ratio 1.9, Ca / potassium (K) ratio 5.6, and Mg/K ratio 3.0.  aAcidez do solo  aFertilidade do solo  aPH  aSoja1 aMOREIRA, A.1 aCASTRO, C.1 aMORAES, M. F.  tCommunications in Soil Science and Plant Analysis, New Yorkgv. 44, n. 20, p. 2941-2951, 2013.