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phosphates

Catalogue: GRDC Updates
The trial consisted of a comparison between 2 wheat and 2 barley varieties, grown either at 15 or 30 cm row spacing's with 4 rates of either granular MAP or liquid P fertiliser - in this case ammoniated phosphoric acid (Easy NP )... Trials were sown to Crusader wheat, at 30 and 40 cm row spacing with 6 rates of P as granular MAP or ammoniated phosphoric acid (Easy NP )... Liquid vs. granular fertilisers Trials conducted by NSW DPI and Incitec-Pivot Ltd in 2004 under high yield potential on the Liverpool Plains compared wheat responses between liquid starter fertilisers (Easy NP and DAP-H2SO4) and granular products (DAP and MAP)...
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Catalogue: GRDC Updates
Current research on row spacing widths has not been conclusive in the higher rainfall zones throughout SE Australia, especially now with recent acquisitions of RTK guidance systems and farmers aiming to achieve inter-row seeding, lessening the need to manipulate crop residues post harvest and prior to seeding operations for the new season program... Yield variance under alternate row spacing, nitrogen and variety treatments In 2007, a completely randomised block design field trial with four replicates was undertaken at the Southern Farming Systems Mininera research site to evaluate the yield variance across two row spacings (200mm & 300mm), three wheat maturities (Kellalac (L), Bolac (ML) & Beaufort (M)) and two nitrogen timings (GS00 & GS31)... A typical farmer input scenario may see Kellalac sown at 200mm row spacings widths, with nitrogen applied at GS31, yielding 4.64t/ha, but when compared to Beaufort sown at 300mm with nitrogen applied up front (GS00), there was an average yield deficit of 0.98t/ha (Table 1.)...
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Catalogue: GRDC Updates
The aim of the investigation was to assess the infectivity and the subsequent effect of salinity on mycorrhizal fungal communities in a saline environment... That there was no difference in total mycorrhizal root length between the non-saline and moderately saline treatment at week 15 could also suggest that the mycorrhizas were able to germinate and colonise roots at some salt levels, highlighting a degree of tolerance... The results of the experiment have demonstrated that the mycorrhizal fungi at this field site display low infectivity at high salinity levels but do express a degree of salt tolerance at lower saline levels...
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Catalogue: GRDC Updates
Williams and Lipsett (1961) found that 50-60 years of wheat cultivation in NSW resulted in a loss of 30% of organic C but only 17% organic P. In natural soils the extent of net immobilization of P in organic matter and probably soil organic matter levels may often be set by the P supply in the parent material... Many authors only consider supply to occur by mass flow and diffusion (the interception component in Table 2.2 is combined with the diffusion component)... Plants can access a greater volume of soil through the formation of a mycorrhizal symbiosis...
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Catalogue: GRDC Updates
" Date: 08.10.2009 USING ROTATION CROPS TO IMPROVE SOIL QUALITY.. Soil structural differences are measured with a cone penetrometer which determines the force needed to push a metal probe slowly into the soil to 600 mm depth... We measured the microbial properties using surface soil samples (0-10 cm) from the crop rotation experiment...
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Catalogue: GRDC Updates
Soil factors affecting micronutrient availability... Even though needed in small quantities, Copper (Cu), Manganese (Mn), Iron (Fe), Zinc (Zn), Boron (B) and Molybdenum (Mo) are all essential for plant growth, although the demand is small relative to nitrogen and phosphorus... The discussion aims to review these issues relative to micronutrients...
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Catalogue: GRDC Updates
Graph two is for a heavy clay Black Vertosol from Spring Ridge; results show the plant available water capacity (PAWC) is 272mm... Rooting depth should be determined through perusal of physical and chemical data and the physical observation of roots and water extraction through soil coring and/or electronic monitoring... Simulation of water storage using the >100 year climate record shows that a short fallow from wheat (assuming a dry soil profile at harvest in November of the previous year) results in a 50% chance of at least 110mm (range of 0-300mm) of water being available for an April planting at Spring Ridge and 80mm (range of 0-180mm) at Nyngan (Figure 8)...
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Catalogue: GRDC Updates
Sandy, acid soils in high rainfall areas are most prone to potassium deficiency, particularly if cut for hay... Regional nutrient budgets show a progressive drawdown of potassium (K) as it is removed in plant products and, depending on cropping system and soils, there may be a need to consider the role of K. Use of K in Australia declined from 183 kt K in 2003 to 149 kt K in 2011 but did recover somewhat in 2012... Around ten times more K will be removed in hay than grain...
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Catalogue: GRDC Updates
Figure 1: Effects of (a) application of an additional 40-60 kg P/ha to soils prior to planting, relative to normal starter P applications alone; and (b) placing that additional P deeper in the soil profile (15-20cm), compared to surface (5-7cm) bands... half of the soil P removed by cropping comes from below the top 10cm and about 90% of that removed P comes from forms/pools of P not measured in the Colwell (bicarbonate P) soil test; and (ii) when luxury rates of P are applied annually , >95% of the residual P stays in the top 10cm of the profile and the depletion of the subsoils continued unchanged... , we used a bioassay to assess how much of the P in the various pools was actually available for plant uptake, and how well this correlated with what the Colwell test predicted...
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Catalogue: GRDC Updates
Managing nutrition on soils that have been treated for water repellence by cultivation.. A comparison of N uptake at 10 N and 50 N weeks after sowing showed significant increases in N uptake in the nil and banded wetter though not in mouldboard and spading... The results suggest that soil nitrogen is more available in the mouldboard and spading treatments than in the nil and banded wetter...
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