%0 Journal Article
%T Rice Husk Biochar Influences Seedling Emergence  of Junglerice (<i>Echinochloa colona</i>) and  Herbicide Efficacy
%A Bhagirath S. Chauhan
%J American Journal of Plant Sciences
%P 1345-1350
%@ 2158-2750
%D 2013
%I Scientific Research Publishing
%R 10.4236/ajps.2013.47164
%X <p class=\"MsoNormal\">
	<span style=\"font-family:Verdana;\">The use of carbonized
rice husk biochar improves the fertility and productivity of poor soils in
rice-based cropping systems. However, biochar may also influence weed seedling
emergence and the efficacy of soil-applied herbicides. Experiments were
conducted in a screenhouse to evaluate the effect of biochar rates (0, 20, 40,
and 80 t，ha</span><sup><span style=\"font-family:Verdana;\">?1</span></sup><span style=\"font-family:Verdana;\">)
and seed burial depth (0, 1, and </span><st1:chmetcnv unitname=\"cm\" sourcevalue=\"2\" hasspace=\"True\" negative=\"False\" numbertype=\"1\" tcsc=\"0\" w:st=\"on\"><span style=\"font-family:Verdana;\">2 cm</span></st1:chmetcnv><span style=\"font-family:Verdana;\">)
on seedling emergence of junglerice (</span><i><span style=\"font-family:Verdana;\">Echinochloa
colona</span></i><span style=\"font-family:Verdana;\">) and the effect of biochar rates and pendimethalin (0, 500, 1000,
and </span><st1:chmetcnv unitname=\"g\" sourcevalue=\"1500\" hasspace=\"True\" negative=\"False\" numbertype=\"1\" tcsc=\"0\" w:st=\"on\"><span style=\"font-family:Verdana;\">1500 g</span></st1:chmetcnv><span style=\"font-family:Verdana;\">，a.i.，ha</span><sup><span style=\"font-family:Verdana;\">?1</span></sup><span style=\"font-family:Verdana;\">) and pretilachlor doses (0, 300, 600,
and </span><st1:chmetcnv unitname=\"g\" sourcevalue=\"900\" hasspace=\"True\" negative=\"False\" numbertype=\"1\" tcsc=\"0\" w:st=\"on\"><span style=\"font-family:Verdana;\">900 g</span></st1:chmetcnv><span style=\"font-family:Verdana;\">，a.i.，ha</span><sup><span style=\"font-family:Verdana;\">?1</span></sup><span style=\"font-family:Verdana;\">) on seedling emergence and seedling
biomass of junglerice. Data were analyzed using nonlinear regression. The
burial depth to inhibit 50% of maximum seedling emergence was </span><st1:chmetcnv unitname=\"cm\" sourcevalue=\".76\" hasspace=\"True\" negative=\"False\" numbertype=\"1\" tcsc=\"0\" w:st=\"on\"><span style=\"font-family:Verdana;\">0.76 cm</span></st1:chmetcnv><span style=\"font-family:Verdana;\"> when biochar was not added to soil
and the depth increased with an increase in biochar rates for soil. Similarly,
compared with the soil with no biochar, the use of bichoar increased the
pretilachlor dose to inhibit 50% of maximum emergence or biomass. The
pretilachlor dose to inhibit 50% of maximum biomass of junglerice was 100, 130,
240, and </span><st1:chmetcnv unitname=\"g\" sourcevalue=\"240\" hasspace=\"True\" negative=\"False\" numbertype=\"1\" tcsc=\"0\"
%K Biochar
%K Emergence
%K Efficacy
%K Biomass
%K Rice
%K Asia
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=33969