Potassium (K) is being gradually removed from Australia’s cropping soils. Since 2002, average crop yields have increased but K fertiliser use has remained static at around 180 kt K/yr. Soil K reserves declined an average of 4 kg K/ha/yr over the last 20 years. Most cropping paddocks have received no […]
Large areas of West Australian cropping soils have low potassium (K) reserves. Acidity also constrains most of these soils. Potassium deficiencies have become more widespread with intensive cropping, removal of hay or stubbles, and K fertiliser inputs lower than removal rates.
James Easton is the Field Research Manager with CSBP […]
Congratulations to Rob Norton, who last night received an award recognising his long contribution to the Fertilizer industry, from Fertilizer Australia. Rob, the Regional Director of the International Plant Nutrition Institute (IPNI), is also the chair of extensionAUS’s crop nutrition Community of Practice. The award was presented at the conference dinner for the 2017 […]
Phosphorus may be over applied in Southern Australian grain farms. A recent survey by IPNI found 80% of paddocks had more P applied than removed over a 3–5 year period. Nutrient Performance Indicators (NPIs) revealed that on average, 0.69 kg P is removed per kg P applied.
Some farms may […]
This season, starter phosphorus (P) is producing strong early crop vigour. Deep P placement effects and the response to starter P are being documented at a long term monitoring site at Terry Hie Hie, in far north New South Wales.
The trial site compares plots with different rates of P […]
Many Australian grain paddocks have a nitrogen (N) deficit. Analysis by the IPNI of 2016 data collected from grain growers across the southern region found few growers were in N surplus. On average, at a paddock level 1.14 kg N is removed for each kilogram of N fertiliser applied. These calculations […]
Chris Dowling explains the keys to successful sampling and interpretation of plant tissue tests in winter crops.
Why use tissue tests?
Plant tissue tests ask the crop ‘what’s wrong?’. Ideally, analysis can get to the core of an issue before yield has been overly compromised.
Plant tissue results are more sensitive […]
Nutrient performance indicators (NPIs) assess how effective and efficient fertiliser applications have been. Last week we talked about using Partial Factor Productivity (PFP) and Partial Nutrient Balance (PNB) together. Those NPIs give you a good idea if your fertiliser investment was worthwhile, and if your paddock nutrient status is stable […]
Effective deep application of phosphorus (P) and potassium (K) fertiliser relies on critical factors. Understanding how to tune important variables in deep applications is emerging from trials in the northern cropping region (central and southern Queensland, and northern NSW).
The critical factors for successful deep applications include:
compatibility of compound products
Nutrient performance indicators (NPIs) are calculations you can do to assess how effective and efficient fertiliser applications have been. Underusing fertiliser limits crop yield and can draw down soil reserves. Unless building soil reserves, overuse is a waste of money, as excess nutrients can be lost and may cause environmental […]