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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 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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Catalogue: GRDC Updates
Feedlot manure can provide half price nutrients.. With around 450,000 cattle on feed in Queensland, there is close to 500,000 tonnes of manure to be utilised as fertiliser each year... Potassium: K There is more than enough K when manure is used to supply P. Sorghum yielding 5 t/ha, has K removal around 22 kg/ha/yr, which means 170 kg of K in 10 t/ha of manure would last 7 years...
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Catalogue: GRDC Updates
The aim of the study was to determine how mouldboard ploughing (soil inversion), rotary spading and banded wetting agent affect the availability of soil nutrients... Soil moisture and pH were measured on a 5 x 5 cm grid and root maps were taken by marking each root intersection with the pit face on a transparent film... Our results from the first year of the study show that the method used to manage soil water repellence had little impact on soil nutrient supply with the exception of phosphorus...
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Catalogue: GRDC Updates
Have a well thought out plan in regard to nitrogen application and amend it as the season unfolds... With the ability to measure starting soil moisture and nitrogen levels and a variety of ways in which we can apply nitrogen to a crop, planning for nitrogen input can start before a seed has hit the ground... A crop should be assessed for disease or other nutrient deficiencies prior to spreading additional nitrogen...
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Catalogue: GRDC Updates
The current practice of relatively shallow applications of nitrogen and phosphorus are confirming yield responses to these nutrients in the long-term on the Darling Downs... Results of the experiments suggest that phosphorus is a key element for increasing crop growth and performance... The measurements taken now include some "farmer practice" references to benchmark against, or how much crop can be grown just doing as you are now...
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Catalogue: GRDC Updates
Agronomy: the key to productive pastures that can sustain profitable grain production in Queensland.. The benefits from pastures are directly related to their productivity; poor pastures will limit beef production, and will do little to improve the soil and future crop production.. The paper provides a series of insights into the need to consider pasture phases in much of our cropping lands, the contributions these pastures can make; and the need for better agronomy to maximise these contributions and make them last...
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