Pesticides Research No. 114 2007 – Effects of Mechanical Weed Control in Spring Cereals – Flora, Fauna and Economy

Effects of Mechanical Weed Control in Spring Cereals – Flora, Fauna and Economy

	Crop yield and yield gain (hkg ha-1)	Net yield gain (hkg ha-1)	Crop density (Plants m-2)	Reduction in crop density	Average reduction pr. treatment (MSM)	Weed density (Plants m-2)	Reduction in weed density	Average reduction per treatment (simple)	Average reduction per treatment (MSM)	Marginal reduction per treatment (MSM)	Reduction in weed density
--- Treatment ---	------------------------------ Barley ------------------------------					-------------------------- Dicot weed -------------------					- Grass -
1. Untreated	48.4	0	208	0%		178	0%				0%
2. Pre + 1 x Post	0.17	-1.5	199	4%	4%	116	35%	35%	35%	35%	64%
3. Pre + 2 x Post	0.8	-1.6	196	6%	3%	83	53%	27%	32%	29%	65%
4. Pre + 3 x Post	-0.3	-3.6	184	11%	4%	46.2	74%	25%	36%	44%*)	76%
5. Pre + 4 x Post	-0.6	-4.6	174	16%	4%	33.2	81%	20%	34%	28%	84%
n=6 trials

Source: Landsforsøg 2001 and 2002 (Petersen 2006, Link).

*) Significantly difrent from the average effect (33%) at the 90% level.