Development of bioassay techniques/ field persistence of trifluralin, simazine and diuron. Calotropis procers and Parkinsonia aculeata.

1. Development of bioassay techniques for trifluralin, simazine and diuron. 2. Field persistence of trifluralin, simazine and diuron in Wongan Hills soils. 3. Taxonomic studies of Calotropis procera, a declared weed of the North-West of Western Australia. 4. Germination studies of calotropis procera and Parkinsonia aculeata

Weed Seed Ecology

Emergence of weed seedlings from different soil depths. 82MT49, Mt Barker Research Station. 83MT4, Mt Barker Research Station. 82NR12, Northam Research Station. 83NR2, Northam Research Station. 82C37, Chapman Research Station. 83C3, Chapman Research Station. Longevity of buried weed seeds. 82MT50, Mt Barker Research Station. 83MT5, Mt Barker Research Station. 82NR13, Northam Research Station. 83NR3, Northam Research Station. 82C38, Chapman Research Station. 83C4, Chapman Research Station. Emergence of weed seedlings in relation to soil type and cultivation. 82PE32, South Perth. Emergence and fate of weed seeds in different depths of cultivated and undisturbed compacted soil. 84C49, Chapman Research Station. 84MT62, Mt Barker Research Station. Fate of surface-lying seeds of brome grass on undisturbed and cultivated soils. 84C50, Chapman research station. 84MT63, Mt Barker Research Station. Dormancy changes of buried and unburied weed seeds over the summer months. 85C93, Chapman research station. 85MT59, Mt Barker research station. Preplanting operations to stimulate doublegee emergence. 85C89, Chapman research station. Post-planting operations to stimulate doublegee emergence. 85C90, Chapman research station. Radish control in lupins. 85N078, Meckering private farm. Changes in the number of viable dock seeds in soil under different soil surf ace treatments. 83V2, Vasse research station and Albany private farm. Persistence and depletion of fiddle dock seed population in the soil. 84V9, Vasse research station. 84MT64, Mt Barker Research Station. Caltrop seed ecology. 85NA65, Narrogin Agricultural College

Seed ecology of weeds

1. Emergence of weed seedlings from different soil depths 82MT49 Mt Barker Research Station 83MT4 Mt Barker Research Station 82NR12 Northam Research Station 83NR2 Northam Research Station 82C37 Chapman Research Station 83C3 Chapman Research Station 2. Longevity of buried weed seeds 82MT50 Mt Barker Research Station 83MT5 Mt Barker Research Station 82NR13 Northam Research Station 83NR3 Northam Research Station 82C38 Chapman Research Station 83C4 Chapman Research Station 3. Emergence of weed seedlings in relation to soil type and cultivation 82PE32 South Perth 4. Changes in the number of viable dock seeds in soil under different soil surface treatments 83V2 Vasse Research Station and Albany Private Farm 5. Changes in dormancy of turnip and doublegee seeds under different field conditions 84C47 Chapman Research Station 84NR1 Northam Research Station 84MT60 Mt Barker Research Station 6. Temperature and light requirements of weed seeds between the time of seed maturity and break of the season 84C48 Chapman Research Station 84NR2 Northam Research Station 84MT61 Mt Barker Research Station 7. Emergence and fate of weed seeds in different depths of cultivated and undisturbed compacted soil 84C49 Chapman Research Station 84MT62 Mt Barker Research Station 8. Fate of surface-lying seeds of bromegrass on undisturbed and cultivated soils 84C50 Chapman Research Station 84MT63 Mt Barker Research Station 9. Persistence and depletion of fiddle dock seed population in the soil 84V9 Vasse Research Station 84MT64 Mt Barker Research Station 10. Emergence periodicity and seedling survival in natural populations of fiddle dock 84V11 Vasse Research Station 84MT65 Mt Barker Research Statio

Seed ecology of weeds. Calotropis/buffel grass interactions

1. Emergence of weed seedlings from different soil depths. 82MT49 Mt Barker Research Station. 83MT4 Mt Barker Research Station. 82NR12 Northam Research Station. 83NR2 Northam Research Station. 82C37 Chapman Research Station. 83C3 Chapman Research Station. 2. Longevity of buried weed seeds. 82MT50 Mt Barker Research Station. 83MT5 Mt Barker Research Station. 82NR13 Northam Research Station. 83NR3 Northam Research Station. 82C38 Chapman Research Station. 83C4 Chapman Research Station. 3. Emergence of weed seedlings in relation to soil type and cultivation 82PE32 South Perth. 4. Changes in the number of viable dock seeds in soil under different soil surface treatments 83V2 Vasse Research Station and Albany Private Farm. 5. The effect of seed pod on the germination/emergence of wild radish 83PE43 South Perth. 6. Germination behaviour and seedling survival in the different forms of wild radish 83PE44 South Perth. 7. Germination responses to temperature and light 83PE74 South Perth. 8. Interactions between buffel grass and calotrope 83PE75 South Perth

Seed Ecology of weeds. Control of Calotropis and Parkinsonia. Calotropis/Buffel grass Interactions.

Emergence of weed seedlings from different soil depths, 82 MT 49, 82 NR 12, 82 c 37. Longevity of buried weed seeds, 82 MT 50, 82 NR 13, 82 c 38. Emergence of weed seedlings in relation to soil type and cultivation. Date of planting study with selected weed species. Chemical control of calotropis, 81 KU 2, 81 KU 3. Chemical control of Parkinsonia, 81 PH 2, 81 PH 3

A \u27natural herbicide\u27 against calotrope?

Buffel grass produces a chemical compound which is toxic to the growth of calotrope seedlings, a declared weed in Western Austrsalia north of the 26th parallel. This new discovery id highly significant in view of the increasing emphasis now placed on weed management as opposed to weed control and the desire to use fewer pesticides

Brome grass population dynamics in relation to control systems

To identify the level of control of brome grass under various rotation systems, 86C1

Preplanting operations to enhance the rate of decline of doublegee seeds in the soil. Postplanting operations to enhance the rate of decline of doublegee seeds in the soil.

Trial 85C89 Location: Chapman Research Station To determine the effect of various preplanting operations, including the use of soil compaction, on the rate of decline of doublegee seeds in the soil.Trial 85C90. Location: Chapman Research Station. To determine the effect of soil compaction after crop seeding on the rate of decline of doublegee in the soil

Brome grass population dynamics in relation to control systems

Developing crop rotation systems for controlling brome grass. Over the last four years the population dynamics of brome grass in various crop and pasture rotation systems have been monitored with the following aims. To identify the level of control of brome grass under various rotation systems, so that farmers can be advised on the degree of infestation likely to be encountered when using a particular system. To design the best control to reduce quickly the anticipated large seed population of brome grass in the soil. To determine whether the persistence of brome grass is related more to survivors shedding seeds or to the persistence of seeds in the soil. To identify the stages that are most vulnerable to control, so that better control strategies can be developed. To note whether there is a shift in weed species with time. Trial 86C! Sites and methods See previous Experimental Summaries for details. The treatments evaluated in the 1990 season are summarized in Table 1. Brome Grass interference at low densities and their potential for population increase in wheat. The objectives of this study were to measure the effects of very low densities of brome grass on wheat yield and to determine their potential for population increase in terms of seed production for the replenishment of the seed bank.This study was considered necessary because our long-term investigation on the population dynamics of brome grass (86 Cl), has shown that the use of lupins as a cleaning crop, led to the reduction of the brome grass infestation level to less than 10 plants/m2 in the following wheat crop

Manipulation of the soil seed reserves of bromus diandrus and B. rigidus by enhancing the breakdown in seed dormancy.

Location: South Perth Field Plots Previous studies on the seed bank of Bromus diandrus indicated that shallow burial of newly shed seeds enhanced the breakdown in seed dormancy over the summer period. To bury the Bromus seeds one practical approach is to introduce sheep into the paddock.This study is a repeat of the previous work but included B. rigidus, another species of Bromus, that is commonly ground growing in association with B. diandrus.Location: South Perth Field Plots