Characters and grain yield of Brassica napus. L as affected by tillage systems and sowing date
In order to study the effect of tillage systems and sowing dates on yield and soil characters of rapeseed genotypes (Brassica napus L.), two field experiments were carried out at the Sari Agricultural Experimental Station, 25 km of Eastern Sari, Iran in 2001-2002 and 2002-2003. The experimental design was split plot factorial with three replications. Three tillage system levels were allocated to main plots, and combination of rapeseed genotypes (Hyola 401, PF) and sowing dates (including. 8, 23 Sep and 7 Oct) were randomized to sub-plots. The tillage levels were consisting of: no- tillage, minimum tillage (residue return with two disks) and conventional tillage (residue return with plow and one disk). Results of ANOVA using SAS Procedures showed that tillage systems and rapeseed genotypes had significant differences at the 1％ probability level on soil moisture content.Conventional tillage produced less soil moisture content in two years and there is no difference between minimum and no tillage.Hyola 401 genotype was better than PF variety in soil moisture content in two years. Combined analysis showed that sowing date and tillage system had significant differences on earthworm, enzymatic activity of dehydrogenase (0-10 cm), dehydrogenase (10-20 cm), alkaline phosphates, acid phosphates, grain yield, oil content and oil yield (P＜0.05). Microbial biomass nitrogen was the most at 8 Sep and no tillage system with 23 Oct and no tillage. PF variety also had the most grain yield at first sowing date and conventional tillage whereas Hyola variety with first sowing date and no tillage was located in the next rank. Varieties were differences (p＜0.01) for 1000-grain weight, grain yield, oil content and oil yield. Result showed that in spit of production more grain yield in plants with conventional tillage, the varieties also could be used with no or minimum tillage and first sowing date for sustainable agriculture. Hyola variety is early maturity therefore it can be used in short season environment. Overall the result of this research showed that minimum and no tillage have advantages in comparison with conventional tillage. Soil water content is advantage of no and minimum tillage in related conventional tillage.
Tillage systems Brassica napus L. Yield and Oil Content Sowing date and Microbial activity
H.Omidi Z.Tahmasebi Sarvestani A.Ghalavand S.A.M.Modarres Sanavy Kamal Sadat Smailian
Agronomy Department, Faculty of Agriculture ILam University, ILAM, Iran Agronomy Department, Tarbiat Modares University, Tehran
国际会议
第十二届国际油菜大会( The 12th International Rapeseed Congress)
武汉
英文
1218-1223
2007-03-26（万方平台首次上网日期，不代表论文的发表时间）