02456naa a2200277 a 450000100080000000500110000800800410001902400400006010000190010024501300011926000090024952016020025865000160186065000160187665000220189265000260191465300260194065300250196670000230199170000180201470000170203270000140204970000180206370000210208177300760210220581392017-01-30       2016    bl uuuu     u00u1 u    #d7 a10.21475/ajcs.2016.10.03.p71772DOI1 aFREITAS, M. E.  aCrop rotation affects soybean performance in no-tillage system under optimal and dry cropping seasons.h[electronic resource]  c2016  aThe purpose of this research was to assess the crop rotation affectson agronomic traits of soybean in optimal (OCS)and dry cropping seasons(DCS). This  research  was  carried  out  in  2010/2011(OCS)and  2011/2012 (DCS)in  a Rhodic  Hapludoxsoil.  The experimental design was set up in a randomized complete block and the treatments were arranged in a factorial 9 x 2, consisting of 9 crop  rotations systems and  two cropping seasons,  with  four  replications.  The  soybean (Glycine  maxcv.  BMX -Potência  RR) was sowed on October 20 th 2010 and October 10th 2011(spring- summer season) 20 days after the fall - winter  cover crops  desiccation .  It was assessed in the R8 reproductive stage (Full maturation) the plant height, the height of the first pod insertion , number of pod per  plants,  number  of  branches  per  plant,  number  of  seed  per  pod,  1000 - grain  weight  and  grain yield. I t  was  observed  that  in  drought  stress (DCS), the  number of branches decrease d, this reduction  was 36% in relation to OCS. For the traits as plant height, first podheight,  1000 - grain  weight  and  yield,  it  was  showed  small  values  in DCS in contrast to  OCS. It  is  feasible  to  introduce  these  cover crops in fall -winter season to make part of a crop rotation system. The number of pod per plant showed higher values under the crop rotation  of  corn/rapeseed/soybean,  which  showed  highly  associated  with  the  soybean  grain  yield. This  research  brought  options  for cover crops system to be viable in no - till system with soybean in spring-summer season.  aCover crops  aGrain yield  aSoil conservation  aConservação do solo  aCulturas de cobertura  aRendimento de grãos1 aSOUZA, L. C. F. de1 aSALTON, J. C.1 aSERRA, A. P.1 aMAUAD, M.1 aCORTEZ, J. W.1 aMARCHETTI, M. E.  tAustralian Journal of Crop Sciencegv. 10, n. 3, p. 353-361, Mar. 2016.