02195naa a2200205 a 450000100080000000500110000800800410001902400330006010000170009324500810011026000090019152015870020065000130178765000090180070000170180970000200182670000200184670000160186677301070188221010092022-05-19       2018    bl uuuu     u00u1 u    #d7 a10.9734/JEAI/2018/432302DOI1 aBRUNO, I. P.  aPhosphorus efficiency in brazilian soybean cultivars.h[electronic resource]  c2018  aThe primary goal of this study was to evaluate the phosphorus uptake and use efficiency in Brazilian soybean cultivars, besides root morphology and architecture characteristics related to phosphorus uptake, carrying out two greenhouse experiments. The experiment 1 was completely randomised, with 56 treatments (soybean cultivars) and 3 replicates. Experiment 2 was completely randomised design with three replicates, and the ten cultivars (greater and lower efficiency) were selected for this assay according to their ability to absorb phosphorus less available determined in experiment 1. The study was carried out at Center of Nuclear Energy in Agriculture, University of São Paulo, Brazil, between February 2011 and August 2012. The isotopic dilution technique was used in the first experiment to assess the phosphorus availability in the soil and to determine the ability of plants to access labile phosphorus by measuring the specific activity of plants grown in soil labeled with radioactive phosphorus. Nine cultivars showed greater phosphorus uptake and used efficiency. The second experiment evaluated the root morphology and architecture. The cultivars with greater uptake efficiency have root morphology and architecture characteristics that favour acquisition of phosphorus from soil compartments that are inaccessible to other cultivars. Phosphorus uptake by plants was not affected by soybean seeds phosphorus content. Identification of these cultivars is very important because it could enable soybean farming in low fertility soils, reducing fertiliser dependence.  aFósforo  aSoja1 aSILVA, A. da1 aFRANZINI, V. I.1 aMARCANTE, N. C.1 aMURAOKA, T.  tJournal of Experimental Agriculture Internationalgv. 25, n. 4, p. 1-14, 2018. Article no. JEAI.43230.