| North
Dakota Agricultural Research North Dakota State University, Fargo, ND 58105
Postplant
tillage provides limited weed control in flax,
lentil and hard red spring wheat (continued) |
|
Abstract |
 Conclusions/Implications
of this researchPostplant tillage was less effective than herbicides for controlling weeds in flax, lentil and hard red spring wheat in this research. These results do not support the substitution of postplant tillage for herbicide treatment when these crops are included in a rotation. The lack of weed control from rotary hoeing or harrowing suggests that weed pressure could be severe in crops following flax, lentil and hard red spring wheat in a crop sequence unless an aggressive control strategy was implemented. Ultimately, the cost of controlling weeds in subsequent crops could offset any possible savings that may result from substitution of tillage for herbicide treatment. Postplant tillage was inconsistent for controlling weeds under the environmental conditions encountered during this experiment. Harrowing and rotary hoeing may more effectively control weeds in other environments. For example, postplant tillage may be effective for controlling weeds in flax, lentil and hard red spring wheat when weeds are germinating and emerging during prolonged dry periods. Weeds also may be controlled by postplant tillage used in combination with cultural control methods, such as delaying the seeding date or increasing the seeding rate. Postplant tillage reduced
broadleaf weed biomass compared to forgoing any
attempt to control weeds in this experiment. This
finding supports the use of postplant tillage for
controlling common lambsquarters, redroot pigweed
and other annual broadleaf weeds in organic and
other farming systems where herbicides are not
used in flax, lentil and hard red spring wheat. Boerboom, C.M., and F.L. Young. 1995. Effect of postplant tillage and crop density on broadleaf weed control in dry pea (Pisum sativum) and lentil (Lens culinaris). Weed Technol. 9:99-106. Carr, P.M., J.C. Gardner, B.G. Schatz, S.W. Zwinger and S.J. Guldan. 1995. Grain yield and weed biomass of a wheat-lentil intercrop. Agron. J. 87:574-579. Carr, P.M., G.B. Martin, and J.D. Harris. 1996. Effect of postplant tillage with and without herbicides on weed control in flax. p. 149-153. In J.F. Carter (ed.) Proc. of the 56th Flax Inst. United States. 20-22 March, 1996, Fargo. Mulder, T.A., and J.D. Doll. 1993. Integrating reduced herbicide use with mechanical weeding in corn (Zea mays). Weed Technol. 7:382-389. Savage, D.C., and M.M. Loux. 1992. Integrating herbicides, hoes, shanks and cranks for weed control in soybeans - Ohio State research results. Proc. North Centr. Weed Sci. Soc. 47:119-120. SAS Institute. 1985. SAS procedures guide for personal computers. Version 6 ed. SAS Inst., Cary, NC. Smolik, J., L. Evjen, K. Lewis, and P. Wieland. 1991. Mechanical and chemical weed control in spring wheat. p. 36. Plant Sci. Pamphlet No. 43. 1990 Annual Progress Rep., Northeast Research Stat., Watertown, SD. Zollinger, R.K. (ed.). 1997. North Dakota weed control guide. North Dak. (Fargo) Ext. Serv. Circ. W-253 (Rev.).
|
NDSU is an equal opportunity institution.