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phosphates

Catalogue: GRDC Updates
A real example, a trial conducted at Condobolin in 2005 comparing DAP and Product A in canola... Figure 1: Canola & alternative phosphorus source "Product A" The chart above shows there was no further significant yield response to phosphorus above 4 kg/ha... 65 kg/ha "Product A" or at an equivalent rate of 65 kg/ha: DAP provides 13 kg P/ha "Product A" provides 4 kg P/ha..
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Catalogue: GRDC Updates
Many soils may already have lost much of this extra, slow release P reserve... Soil testing for available P status commonly involves a Colwell test on the 0-10 cm layer... The paper summarises some recent work that attempts to quantify the differences in availability of sparingly soluble P sources as affected by soil acidification...
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Catalogue: GRDC Updates
Aim to sow large (>5 g/1000 seeds) canola seed to achieve adequate establishment rates from early sowing... Hybrid vigour (heterosis) has an indirect effect (larger seed size) and a direct effect (enhanced vigour) on canola establishment.. The results reported have greatest relevance for an early planting opportunity and a lesser relevance for canola that is dry sown or planted into moisture in May...
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Catalogue: GRDC Updates
Phosphorus application improves grain yield regardless of variety choice, but limit the amount of P applied in direct contact with seed... Due to lack of adequate follow-up rain at both Nyngan and Trangie sites after the in-crop application, only the rate component of 2013 trials is reported ... Although N application can increase grain yield, it may reduce oil concentration in the grain...
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Catalogue: GRDC Updates
Chickpeas provide an excellent break crop and gross margin opportunity for growers, and many are now realizing the importance of break crops in a farming system with the current expense of nitrogen... Operationally chickpeas fit very well into many farming systems, often being able to be sown before cereals and generally harvested after... Harvesting on time should be a priority in such a high valued crop...
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Catalogue: GRDC Updates
Managing for least cost rather than most profit.. In summary - For the effort of spraying the paddock twice over summer and an investment of $30/ha, a gain could be achieved in the following wheat crop of $105/ha.. P fertiliser should not be broadcast prior to seeding in 2008 because this approach is only justified in situations where soil P reserves are high and dressings are designed to maintain those reserves - in 2008 simply do not broadcast those paddocks and use the money saved on other inputs which will return better profits...
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Catalogue: GRDC Updates
0-10 cm Zinc DTPA soil test values NSW 2008 by location... We have to maximise income when those 3 good seasons happen... The aim of this data and the economic + risk analysis is to provide you with a framework to assist you thinking through your circumstances: soil test P on each paddock, cash available to be used across all paddocks, and your attitude to risk...
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Catalogue: GRDC Updates
Soil testing can be used to assess the likely nutrient constraints, but soil testing and soil test interpretation is not a precise science... To summarise a number of trial results, some sites had consistent increases in crop growth for crop-after-crop; others were more hit-and-miss... 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...
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Catalogue: GRDC Updates
Dry weight response of crops to increasing P levels with and without mycorrhizal fungi in the soil... Unlike saprobic soil fungi, which colonise and break down organic matter and do not require a host plant in the system to complete their lifecycle, arbuscular mycorrhizal fungi (AMF), the type found in cropping systems, do require the presence of a host to reproduce and are called obligate symbionts... Having adequate populations of mycorrhizal fungi present in soils can be beneficial and in some cases essential for crop growth...
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Catalogue: GRDC Updates
Optimising water use efficiency in western NSW.. The relative merit of different rotation crops can also be assessed by looking at the amount of water they extract from the soil profile... Research has shown that canola is better able to extract phosphorus (P) from soil than wheat (Bolland and Brennan 2008) meaning that maximum yield of canola can be achieved with lower P application than is required for wheat...
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