Green manuring appendix

SEA Working Paper 00/11

The Value of Green Manuring in the Integrated Management of Herbicide-Resistant Annual Ryegrass (Lolium rigidum)

M. Monjardino, D.J. Pannell, S. Powles

Main paper is at http://www.general.uwa.edu.au/u/dpannell/dpap0011.htm

APPENDIX

Table 1A. Effect of herbicide use, initial ryegrass seed bank numbers and green manuring on annuity and ryegrass seedbank numbers in year two, for two different cropping rotations.

			WWL		WLWC
Ability to use Group A&B herb. due to resistance (no. of applic.)	Initial ryegrass seed bank (seeds/m2)	Green manuring	Annuity ($/ha/yr)	Ryegrass seeds/m2 in year 2	Annuity ($/ha/yr)	Ryegrass seeds/m2 in year 2
0	100	Yes	80	124	63	101
0	100	No	81	124	63	101
0	100	Net value	-1		0
0	200	Yes	76	244	59	200
0	200	No	75	244	58	200
0	200	Net value	1		1
0	400	Yes	72	477	54	390
0	400	No	70	477	52	390
0	400	Net value	2		2
0	800	Yes	67	910	49	745
0	800	No	64	910	45	745
0	800	Net value	3		4
0	1600	Yes	61	1669	43	1368
0	1600	No	58	1669	39	1368
0	1600	Net value	3		4
2	100	Yes	89	48	76	26
2	100	No	94	48	80	26
2	100	Net value	-5		-4
2	200	Yes	88	96	74	51
2	200	No	91	96	77	51
2	200	Net value	-3		-3
2	400	Yes	86	191	71	102
2	400	No	87	191	74	102
2	400	Net value	-1		-3
2	800	Yes	83	375	68	204
2	800	No	82	375	70	204
2	800	Net value	1		-2
2	1600	Yes	78	725	65	403
2	1600	No	76	725	65	403
2	1600	Net value	2		0
6	100	Yes	101	58	99	26
6	100	No	108	58	108	26
6	100	Net value	-7		-9
6	200	Yes	100	115	99	51
6	200	No	106	115	107	51
6	200	Net value	-6		-8
6	400	Yes	99	228	99	102
6	400	No	103	228	106	102
6	400	Net value	-4		-7
6	800	Yes	98	448	98	204
6	800	No	99	448	104	204
6	800	Net value	-1		-6
6	1600	Yes	95	865	96	403
6	1600	No	94	865	101	403
6	1600	Net value	1		-5

Table 2A. Effect of weed control in the first year of the rotation and of green manuring on annuity and ryegrass seed bank numbers in year two.

Weed control in the first year of the rotation

Green manuring

Annuity

($/ha/yr)

Ryegrass seed bank in year 2 (seed/m2)

40%

Yes

Net value

-1

10701

50%

Yes

Net value

10131

60%

Yes

Net value

9360

70%

Yes

Net value

8480

80%

Yes

Net value

7226

90%

Yes

Net value

5694

95%

Yes

Net value

4507

98%

Yes

Net value

3811

99%

Yes

Net value

3561

99.9%

Yes

Net value

3328

Table 3A. Effect of ryegrass seed germination, initial ryegrass seed bank numbers and green manuring on annuity and ryegrass seed bank numbers in year two, for two different cropping rotations.

			WWL		WLWC
Ryegrass seed germination %	Initial ryegrass seed bank (/m2)	Green manuring	Annuity ($/ha/yr)	Ryegrass seeds/m2 in year 2	Annuity ($/ha/yr)	Ryegrass seeds/m2 in year 2
70	100	Yes	83	115	67	95
70	100	No	87	115	69	95
70	100	Net value	-4		-2
70	200	Yes	81	227	63	189
70	200	No	82	227	64	189
70	200	Net value	-1		-1
70	400	Yes	77	446	58	370
70	400	No	77	446	58	370
70	400	Net value	0		0
70	800	Yes	72	858	52	713
70	800	No	70	858	51	713
70	800	Net value	2		1
70	1600	Yes	66	1599	46	1334
70	1600	No	64	1599	45	1334
70	1600	Net value	2		1
90	100	Yes	77	133	58	93
90	100	No	75	133	57	93
90	100	Net value	2		1
90	200	Yes	73	263	54	183
90	200	No	70	263	52	183
90	200	Net value	3		2
90	400	Yes	68	511	50	359
90	400	No	64	511	46	359
90	400	Net value	4		4
90	800	Yes	63	966	45	688
90	800	No	59	966	40	688
90	800	Net value	4		5
90	1600	Yes	58	1747	40	1273
90	1600	No	53	1747	35	1273
90	1600	Net value	5		5

Citation: Monjardino, M., Pannell, D.J. and Powles, S. (2000). The Value of Green Manuring in the Integrated Management of Herbicide-Resistant Annual Ryegrass (Lolium rigidum). (SEA Working Paper 00/11). http://www.general.uwa.edu.au/u/dpannell/dpap0011.htm

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Copyright © 2000 Marta Monjardino, David J. Pannell, and Stephen Powles Last revised: May 21, 2003.

Copyright © 2000 Marta Monjardino, David J. Pannell, and Stephen Powles
Last revised: May 21, 2003.