%0 Journal Article
%T Winter Oilseed Crops after Soybeans as Tools for Weed Management in Brazilian Savannah Cropping Systems
%A Germani Concenco
%A Cesar Jose da Silva
%A Michely Tomazi
%A Rodolpho Freire Marques
%A Sabrina Alves dos Santos
%A Maxwell Eliezer dos Santos Alves
%A Waggner Gomes Palharini
%A Air Lisboa Froes
%A Denise Nascimento Fabris
%J American Journal of Plant Sciences
%P 2277-2288
%@ 2158-2750
%D 2014
%I Scientific Research Publishing
%R 10.4236/ajps.2014.515242
%X <p style=\"text-align:justify;\">
	<span style=\"font-size:10pt;font-family:Verdana;\">We aimed with this study to evaluate the
potential of oilseed crops planted following soybean, in terms of their ability
to inhibit the occurrence of weed species under Brazilian Savannah cropping
systems. The long-term experiment was installed in 2010 at Dourados, MS,
Brazil, and in completely randomized blocks design with five replications with
12 </span><span style=\"font-size:10pt;font-family:Verdana;\">¡Á</span><span style=\"font-size:10.0pt;font-family:&quot;\"><span style=\"font-family:Verdana;\"> 24 m plot size. For three consecutive years (2010/11, 2011/12 and
2012/13), soybeans were planted in all the area by October/November being
harvested in February/March, when previously marked plots were planted in April
with: (1) radish (</span><i><span style=\"font-family:Verdana;\">Raphanus sativus</span></i><span style=\"font-family:Verdana;\">); (2) rapeseed (</span><i><span style=\"font-family:Verdana;\">Brassica napus</span></i><span style=\"font-family:Verdana;\">);
(3) crambe (</span><i><span style=\"font-family:Verdana;\">Crambe abyssinica</span></i><span style=\"font-family:Verdana;\">); (4) winter fallow-no plantation after
soybeans. In all years the same crop was repeated at the same plots, with no
crop rotation. Phytosociological characterization of weed species was carried
out in winter (after oilseeds harvest), pre-planting and post-emergence of
soybean for the three years. Relative abundance, frequency and dominance, as
well as the importance value for each species, was obtained. Areas were also
intra-characterized by the coefficients of Simpson, Shannon-Weiner and Shannon-Weiner¡¯s
Evenness Proportion, and areas were compared for species dissimilarity with
Jaccard¡¯s presence-only coefficient, by multivariate cluster analysis. Oilseed
crops definitely contribute for sustainable weed management as a cultural tool.
The most important oilseed crop weeds in the Savannah-like region of Brazil
were </span><i><span style=\"font-family:Verdana;\">Amaranthus hybridus</span></i><span style=\"font-family:Verdana;\">, </span><i><span style=\"font-family:Verdana;\">Richardia brasiliensis</span></i><span style=\"font-family:Verdana;\">, </span><i><span style=\"font-family:Verdana;\">Lepidium
virginicum</span></i><span style=\"font-family:Verdana;\">, </span><i><span style=\"font-family:Verdana;\">Leonotis nepetifolia</span></i><span style=\"font-family:Verdana;\"> and </span><i><span style=\"font-family:Verdana;\">Hybanthus parviflorus</span></i><span
%K Phytosociology
%K Diversity
%K Similarity
%K Sustainability
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=47668