Chemical and Biological Technologies in Agriculture

Table 4 Weed density, dry weight, and grain yield in different crop sequences, Experiment I

From: Perennial forage legume cultivation and their above-ground mass management methods for weed suppression in arable organic cropping systems

The first crop in rotation, 2013						The second crop in rotation, 2014
Crops	Cereal growth stage (BBCH)
	27	75	75	Grain yield		Crops	27	75	75	Grain yield
	Density, weeds m⁻²		Weight gm⁻² DM	kg ha⁻¹	%	Crops	Density, weeds m⁻²		Weight gm⁻² DM	kg ha⁻¹	%
O	172	47	5.2	5669	100	SW	204	112	18.5	3767	100
O + GCM	132	38	7.7	6322*	112	SW	234	119	15.2	4281	114
O + GCM	152	48	11.1	6322*	112	SW + WC	154*	31**	6.2**	4162	110
O + RC	109**	17*	2.6	5988	106	SW	192	104	21.6	4420**	117
P + O	133	78	37.4**	5294	93	SW	207	87	16.0	4323	115
P	124	79	154.4**	3051**	54	SW	190	108	19.1	4308	114
RC	151	107*	168.3**	0	0	SW	205	119	14.9	3603	96
Mean	139	59	55.2	5441		Mean	198	97	15.9	4123
Statistics of ANOVA (p)	< 0.01	< 0.01	< 0.01	< 0.05		Statistics of ANOVA (p)	< 0.05	< 0.01	< 0.05	< 0.01
The third crop in rotation, 2015
SB	67	99	8.5	2491	100
SB	64	104	9.3	2683	108
SB	60	55*	7.7	5016**	201
SB	72	101	10.8	2456	99
SB	91**	137**	14.4*	2536	102
SB	98**	145**	11.9	2286	92
SB	96**	103	9.7	2405	97
Mean	78	106	10.3	2839
Statistics of ANOVA (p)	< 0.01	< 0.01	< 0.05	< 0.01

O oat (control), RC red clover, WC white clover, SW spring wheat, SB spring barley, GCM granulated cattle manure
Values in italic and followed by * or ** are significantly different than the control according to other variant at p < 0.05 and p < 0.01, respectively

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