Field Residue Bioassays Seedling Emergence

3 Plant-Plant AUelopathic Interaction. Phase II Field/Laboratory Experiments 

Desiccated rye and wheat cover crops were the most consistent in the inhibition of weed seedling emergence. 

Weed seedling emergence was stimulated (mean maximum 409%) when living cover crop biomass was incorporated into the soil, and 

Cover crop residues provided only very weak control of broadleaf signal grass suggesting that control of monocotyledonous species may be a serious problem. 

bulk-soil total phenolic acid content was not a good proxy for promot-ers/modifiers/inhibitors complex, 

---

Abstract This chapter describes the underlying criteria and assumption in the development and execution of field and associated laboratory bioassays. It provides details and commentary regarding the materials and methods used. More specifically, describes how glyphosate-desiccated wheat and other cover crops (crimson clover, subterranean clover, and rye) in no-till systems can directly and indirectly influence morningglory, pigweed, and prickly sida seedling emergence, with emphasis on the role of phenolic acids in plant residues and soil. 

---