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Water infiltration

Catalogue: Broadacre Field Crops DAFF QLD
Black field earwig, showing three sizes.. Black field earwig, showing three sizes nymph and adults chew on germinating seed and young seedlings... Use germinating seed baits or digging and sieving to detect adults and nymphs prior to planting...
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Catalogue: Broadacre Field Crops DAFF QLD
Black field earwig, showing three sizes.. Black field earwig, showing three sizes nymph and adults chew on germinating seed and young seedlings... Use germinating seed baits or digging and sieving to detect adults and nymphs prior to planting...
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Catalogue: GRDC Updates
Surface application of ammonium sulphate fertiliser on alkaline cropping soils of northwest NSW poses a high risk of volatilisation loss, particularly if there is calcium carbonate (lime) at the surface... We are currently testing a range of surface soil samples from across northwest NSW and will present some results of these in the talk... Following this we will assess volatilisation loss potential at a selection of these soils to gauge the potential for losses in typical cropping situations...
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Catalogue: Ground Cover
Bigger markets, higher prices, a more widespread adoption of 'best-practice agronomy' and improved genetics point to the ability of the Australian grain sorghum industry to improve profitability and double production.. A rise in grain sorghum prices, due to higher world grain prices, is likely to increase the planted area, with some estimates suggesting the crop could double by 2012... Rising sorghum prices combined with adoption of best-practice technology should bring a major increase in sorghum plantings in these areas...
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Catalogue: GRDC Updates
Soil organic matter is divided up into five soil pools including; biomass (dead and alive), fresh organic matter (FOM), active soil organic matter (SOM A ) and passive soil organic matter (SOM P )... Net N mineralisation, over the crop growing season (May - October), was calculated to be only 9 kg N/ha/yr when default decay rate of decomposition of FOM (0.05/day), of SOM A (0.00015/day) and of dead microbial (0.01/day) material were used... Daily rates of N mineralisation (kg/ha/d) of FOM and SON A soil pools in the presence of wheat crop residue (1995 crop) with lupins grown in 1996, over the period December 1995 to December 1996...
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Catalogue: GRDC Updates (West)
KEYMESSAGES Inoculating pasture legumes must be an ongoing process... The efficiencies of the products were continually evaluated for use in Western Australian agriculture by research at the Centre for Rhizobium Studies... Measurements included the percentage of plants nodulated, the amount of nodules on each plant and the strain of bacteria in each nodule, which was identified by fingerprint profiling using polymerase chain reaction (PCR) as described in Yates (2005)...
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Catalogue: GRDC Updates (West)
Agriculture is under increasing pressure to develop management practices to minimise P loss... The modelling predicts that depending on location and the benefit from biochar a farmer can spend between $15 and $165 either buying or producing biochar on farm and break-even... In this type of seasons, P fertiliser placed at 14 cm depth remained in moist soil longer than P placed at 4 or 8 cm and was more available for crop uptake later in the season...
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Catalogue: GRDC Updates (West)
Soil acidity, water repellence and root disease have been shown to reduce crop access to soil P and where these constraints are present yield responses to fertiliser P have occurred even where soil test P levels are classed as sufficient... Recent research has shown that the majority of soils tested from the Western Australian cropping area have a sufficient level of soil phosphorus... Recent work has shown that where soil pH (CaCl2) is less than 4.6, moderate water repellence occurs (WDPT > 4 minutes) or root disease is present, crop access to soil P can be restricted and the efficiency of use of P fertiliser is less than treatments where these constraints do not exist...
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Catalogue: GRDC Updates (West)
It should be noted that the yield responses measured with paired cuts on water repellent areas were quite large compared to the average grain yield advantage for the winged point-paired row system across the whole paddock (200 kg/ha)... Recent research indicates that some of these formulations only work on quite specific soil types such as the forest loamy gravels or on firmer soils with reasonable clay content and are less effective on the repellent sands... Soil water content contradicted the findings on water repellence and indicated that water infiltration was best under zero-tillage and stubble retention and poorest under stubble removal and cultivation (Figure 1B), and this impacted on crop performance...
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Catalogue: Ground Cover
A lack of rain is causing some to contemplate a change of plans, while others feel they have been very lucky with the rain they have received... Our district was starting to show glimpses of getting back on track after 2002, but it looks like we"re in for a setback - in a 50km radius there are farms that have had no rain for about two months and mixed farmers are bringing in hay to feed livestock... We"ve received 320mm of rain this year - 20mm of it over the June/July weekend - and, with good soil moisture, we"re not desperate for more at the moment...
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