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phosphorous management

Catalogue: GRDC Media
Soil testing the key to fertiliser strategy.. Subsoil reserves of mineral nutrients such as P have been run down over recent decades, with practices such as direct drill cropping accelerating the loss... Soil testing provides an understanding of your fertility profile and is a vital step in making informed fertiliser decisions...
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Catalogue: GRDC Updates
Today the world faces looming scarcities of just about everything required to produce high yields of food - water, land, nutrients, oil, technology, skills, fish and stable climates... To put our consumption in perspective, over a lifetime, each of us uses enough water to float the USS Enterprise, a rather large aircraft carrier... An easy way to improve global food security is to reduce the colossal waste of half the food we currently produce...
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Catalogue: GRDC Updates
My first point is that the central issue in the human destiny in the coming half century is not climate change, terrorism or the global financial crisis, it is whether we can achieve and sustain such a vast supply of food... There are looming scarcities of just about everything we need to produce good food - water, land, nutrients, oil, technology, skills, fish, finance and stable climates and it is very hard to solve one, without making the others worse... An easy way to improve global food security is to reduce the colossal waste of half the food we currently produce...
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Catalogue: GRDC Updates
Climate variability (inter- and intra- season rainfall and temperature patterns) and prices received for grain of a particular quality make it very difficult to offer serious strategies to optimise profitability in the short term... There are two periods of the year when nitrogen application offers the greatest likelihood of recovery of applied nitrogen in winter cereals: around the end of the calendar year and in July (GS 3.2) according to studies over approximately 10 years starting in the late 1970's, over six No-Till sites in by Felton and Marcellos... Nitrogen costing about $1.40 per kilogram, operating costs greater than $310 per ha, grain yields averaging 2.2 tonnes per ha and grain prices sub- $180 for grain (at depot), make it difficult to 'make ends meet'...
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Catalogue: GRDC Updates
Low protein in cereal grains is indicative of poor nitrogen supply to the grain during the grain fill period... Figure 6: Relative wheat varietal nitrogen uptake performance assessed by grain nitrogen content (kg/ha) - Qld and NW NSW NVT Trials - 2011.. Soil test data from autumn 2012 suggests that many paddocks had no benefit from normal 20 - 50 kg/ha summer fallow N mineralisation due to losses from waterlogging or the >20 kg/ha residual mineral N present in the post-harvest ( Figure 2)...
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Catalogue: GRDC Media
Crop tour takes in central west NSW.. The newly-formed panel for 2013-15 visited five farms and the Trangie Research Station to hear from growers, advisers and researchers, and discuss research priorities and needs... Caption : GRDC northern panellists Kelly Becker, Theodore , Queensland and Jack Williamson, Moree , NSW (pictured right) compare crop notes with Glenn Shepherd, IMAG, Dubbo and grower James Hassall on his Gilgandra district property, "Kiewa"...
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Catalogue: GRDC Media
Growers planting high yielding varieties this winter crop season will need to get nutrition - including nitrogen, phosphorus and sulfur - spot on to achieve high protein levels... "We're in a situation in the northern region from Dubbo, NSW to central Queensland this summer that part of the region has experienced flooding so we're going to see denitrification," Ms O'Keeffe says... Audio Caption : Sharon O'Keeffe, GRDC manager regional grower services - north says conditions have varied across the northern region this summer but growers need to consider their fertiliser regime early to achieve protein targets..
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Catalogue: GRDC Updates
Nutrient rates used are 40 kg P (MAP or a fluid source), 200 kg K (SOP or MOP), and 40-80 kg S (SOA or ATS), with the high application rates designed to allow impacts to be followed through an extended crop rotation... Urea was applied to either balance the N application from MAP, SOA, ATS or applied at a rate to make N non-limiting... All are intended to be evaluated over a series of crops at each site, rather than one-off snap-shots, helping us to understand the residual value of fertilizers applied in northern soils and climates...
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Catalogue: GRDC Updates
3. Choose tolerant wheat varieties to maximise yields (go to nvtonline.com.au).. From our research, the optimal temperature for reproduction of Pratylenchus thornei is 22C; populations increased, although at slower rates, from 17 to 28C... We have also found reduced growth and yield of wheat and chickpea following canola in a low phosphorus soil (7 mg/kg Colwell P) in two separate 2-year winter crop rotation experiments...
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Catalogue: GRDC Updates
The research that I will undertake in my PhD program aims to understand how legume break crops can mobilise P for the following wheat crop... We proposed that surplus mobilised P, resulting from the root activity of the companion break crop, would be scavenged and taken up by the inter-mingled wheat roots... The companion plants of chickpea, white lupins and field pea significantly increased P uptake by wheat (Figure 1) when the roots of both the wheat and the pulse were grown together, compared to when the wheat roots grew separated from those of the legume crop...
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