Influence of Seeding Rate on Weed Density in Soybean Planting System for Southeastern Coastal Plains | Science Publications

American Journal of Agricultural and Biological Sciences

Pawel Wiatrak¹  Guihua Chen¹ 

关键词: Soybean planting;    maturity group;    weed pressure;    weed density;    grain yield;    Normalized Difference Vegetation Index (NDVI);    Leaf Area Index (LAI);    Days After Planting (DAP);    coastal plain;    Analysis Of Variance (ANOVA);   

DOI  :  10.3844/ajabssp.2011.180.184

学科分类：农业科学（综合）

来源: Science Publications

【 摘 要 】

Problem statement: Increasing seeding rates may help decrease weed pressure in soybean[Glycine max (L.) Merr.] wide row spacing. Approach: The objective of this study was to evaluate theinfluence of five glyphosate-resistant soybean Maturity Groups (MG) (IV, V, VI, VII and VIII) and sixseeding rates (68,000,136,000, 204,000, 272,000, 340,000 and 408,000 seeds ha^-1) on weed densityunder dryland conditions on the Southeastern coastal plain in 2007-2009. Results: Weed decrease withincreasing seeding rate varied over years. Weed density was generally lower at higher seeding rates formost MG soybeans at 30 and 60 DAP, except MG IV and VIII at 30 DAP in 2007 and MG VI at 30DAP in 2008. At 60 DAP, soybean leaf area index (LAI) and normalized difference vegetation index(NDVI) were greater with lower weed density. Conclusion: Additionally, negative correlations wereobserved between weed density and plant LAI/NDVI for all MG in 2008 and MG IV through VI in2009. These results suggest that increased seeding rates may help decrease weed pressure and improvesoybean growth at early growth stages. However the response of weed pressure to seeding rate mayvary over years and depend on MG soybean.

【 授权许可】

Unknown