Author
 |
Lenssen, Andrew |
|
Submitted to: Weed Technology
Publication Type: Peer Reviewed Journal Publication Acceptance Date: 8/5/2008 Publication Date: 1/1/2009 Citation: Lenssen, A.W. 2009. Land Rolling Increases Broadleaf Weed Emergence in Barley, Pea and Fallow. Weed Technology. 23:23-27. Interpretive Summary: In the northern Great Plains, after planting of annual pulse and forage crops, fields are land rolled to push rocks back into the soil to prevent damage to harvest equipment. A field trial was conducted to determine if land rolling influenced density or biomass of weeds associated with field pea, forage barley and summer fallow. The experiment included two planting dates each of two years for barley and pea. Separate fallow plots were included with each planting date. Preplant tillage was done with a field cultivator for all treatments. Across years, crops, and planting dates, land rolling approximately doubled densities of tumble mustard, Russian thistle, kochia, and redroot pigweed shortly after crop emergence and at harvest compared to non-rolled plots. Land rolling increased density of early emerging green foxtail but density at harvest was unaffected. Wild oat densities were not influenced by rolling. Weed biomass at harvest was greater in land rolled plots than in non-rolled plots. Land rolling after planting decreased subsequent pea yield by 295 lb/acre, but did not influence water use or water use efficiency. Land rolling is advantageous by increasing broadleaf weed recruitment in forage barley, but may increase problematic broadleaf weeds in pea. Technical Abstract: In the northern Great Plains fields are land rolled after the planting of annual pulse and forage crops to push rocks back into the soil to prevent damage to harvest equipment. Field trials were conducted in 2004 and 2005 to determine if land rolling influenced weed density or biomass associated with field pea, forage barley and summer fallow. The experiment included two planting dates for both barley and pea. Separate fallow plots were included with each planting date. Preplant tillage was conducted with a field cultivator for all treatments. Across years, crops, and planting dates, land rolling approximately doubled densities of tumble mustard, Russian thistle, kochia, and redroot pigweed shortly after crop emergence and at harvest compared to non-rolled treatments. Land rolling increased density of early emerging green foxtail but density at harvest was not affected. Wild oat densities were not influenced by rolling. Weed biomass at harvest was greater in land rolled plots than in non-rolled plots. Land rolling after planting decreased subsequent pea yield by 330 kg/ha, but did not influence water use or water use efficiency. Land rolling is advantageous by increasing broadleaf weed recruitment in forage barley, but may increase problematic broadleaf weeds in pea. |
