Observations on the breeding biology ofAmbassis agassiziiSteindachner, 1867 (Teleostei: Ambassidae) from the Murray Darling Basin in New South Wales

2008 ◽  
Vol 34 (4) ◽  
pp. 476-498 ◽  
Author(s):  
L. Llewellyn
Keyword(s):  
New South ◽  
New South Wales ◽  
Breeding Biology ◽  
South Wales ◽  
Murray Darling Basin

The nature, distribution and management of sodic soils in New-South-Wales

Soil Research ◽  
1993 ◽  
Vol 31 (6) ◽  
pp. 839 ◽  
Author(s):  
DC Mckenzie ◽  
TS Abbott ◽  
KY Chan ◽  
PG Slavich ◽  
DJM Hall
Keyword(s):  
New South ◽  
New South Wales ◽  
Clay Mineralogy ◽  
Carbonate Content ◽  
Chemical Compositions ◽  
Sodic Soils ◽  
Sodic Soil ◽  
Related Factors ◽  
South Wales ◽  
Murray Darling Basin

Accurate data on the distribution of the various types of sodic soils in New South Wales are not available. However, general observations suggest that large areas are affected by structural instability as a result of sodicity, particularly on grey clays and red-brown earths of the Murray-Darling Basin. There is a strong need for new sodicity surveys because the production of crops and pasture often is well below potential on these lands. Exchangeable sodium data on their own do not adequately describe sodic soil behaviour, so information is also required about related factors such as electrical conductivity, exchangeable magnesium, clay mineralogy, pH, calcium carbonate content, degree of remoulding, and the frequency of continuous stable macropores. Critical limits for sodicity that are used by soil management advisory services need to be redefined. Considerable research into the reclamation and management of sodic soils has occurred in the irrigation areas and rainfed cropping districts of the Murray-Darling Basin in New South Wales. Mined and by-product gypsum, and to a lesser extent lime, have been shown to greatly improve the physical condition and profitability of production from soils with a dispersive surface. However, the responses to these treatments are less likely to be economical when sodicity is confined to the subsoil. Adequate supplies of gypsum and lime are available in New South Wales, but further research is required to determine economically optimal and environmentally acceptable rates and frequencies of application, particle sizes and chemical compositions for different farming systems that utilize the various types of sodic soil.

Responses of nitre goosefoot (Chenopodium nitrariaceum) to simulated rainfall and depth and duration of experimental flooding

2019 ◽  
Vol 70 (4) ◽  
pp. 493
Author(s):  
William Higgisson ◽  
Sue Briggs ◽  
Fiona Dyer
Keyword(s):  
Seed Production ◽  
New South ◽  
New South Wales ◽  
Simulated Rainfall ◽  
Leaf Production ◽  
South Wales ◽  
Murray Darling Basin ◽  
Flooded Areas ◽  
Water Depths

Nitre goosefoot (Chenopodium nitrariaceum (F.Muell.) is a woody shrub that occurs at the edges of floodplains and other intermittently flooded areas across the Murray–Darling Basin. No studies have been conducted on the hydrological requirements of nitre goosefoot, and the species is not considered in watering requirements of floodplain species of the Murray–Darling Basin. This study investigated the effects of simulated rainfall and depth and duration of experimental flooding on mortality, leaf production, biomass and seed production of nitre goosefoot. Nitre goosefoot plants were grown from seeds collected near Hillston, New South Wales, Australia. The plants were subjected to the following 14 hydrological treatments: dry (no water applied), rainfall (simulating rainfall conditions at Hillston) and 12 combinations of three water depths (10cm, 50cm, 75cm) with four durations of inundation (5 days, 10 days, 20 days, 40 days). The study found that nitre goosefoot plants survived flooding, providing plants were not totally submerged, leaf production increased during flooding and after drawdown, and leaf production, biomass and seeding were highest under shallow flooding for approximately 1 month. The results of the study allow the hydrological requirements of nitre goosefoot to be considered in environmental watering programs.

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