Rasmussen, I.A.; Askegaard, M. and Olesen, J.E. (2005) Long-term organic crop rotation experiments for cereal production - perennial weed control and nitrogen leaching. In: Köpke, U.; Niggli, U.; Neuhoff, D.; Cornish, P.; Lockeretz, W. and Willer, H. (Eds.) Researching Sustainable Systems: Proceedings of the First Scientific Conference of the International Society of Organic Agriculture Research (ISOFAR), International Society of Organic Agriculture Research (ISOFAR), pp. 227-230.
In long-term organic crop rotation experiments for cereal production, stubble cultivation to control perennial weeds increased nitrogen leaching compared to catch crops grown after harvest. Stubble cultivation contributed to the control of Elymus repens on a sandy soil, but not to the control of Cirsium arvense on a loamy soil. Manure application had a tendency to decrease E. repens density in one rotation at the sandy soil. Grass-clover green manure decreased C. arvense in the succeeding crops. Despite high infestations of perennial weeds, yields were at the same level with as without stubble cultivation. The results point to an important dilemma in organic farming: should the farmer control perennial weeds in the stubble at the expense of losing nitrogen by leaching? Or should catch crops be grown that preserve nitrogen, but allow E. repens to proliferate?
|EPrint Type:||Conference paper, poster, etc.|
|Type of presentation:||Paper|
|Keywords:||Elymus repens; Cirsium arvense; catch crops; summer fallow; grass-clover green manure; yield|
|Subjects:|| Crop husbandry > Production systems > Cereals, pulses and oilseeds|
Crop husbandry > Crop combinations and interactions
Crop husbandry > Weed management
|Research affiliation:||Denmark > DARCOF II (2000-2005) > IV.1 (EXUNIT) Experimental units for research in organic farming systems|
|Deposited By:||Rasmussen, Researcher Ilse A.|
|Deposited On:||18 Oct 2005|
|Last Modified:||12 Apr 2010 07:31|
|Refereed:||Peer-reviewed and accepted|
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