Category: Fallow

Deep placement of fertiliser delivers results

Mike Bell, expert in deep fertiliser placement, smiling in paddock

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: placement product choice […]

What happens to urea with high residue loads?

Question to @aucropnutrition via twitter What effect do high crop residues have on spread urea? Does some of the applied nitrogen (N) get used to break down the stubble and therefore become unavailable to the plant? When urea dissolves on the surface of the residues in humid air or dew […]

Can I burn lime and gypsum with stubble?

What happens to gypsum or limestone when stubbles are burnt? Gypsum and limestone are soil amendments – sometimes spread onto paddocks before burning of crop stubble. Stubble or grass fires can affect limestone and gypsum in two ways: chemical changes due to high temperatures, and convective losses as ash rises. […]

Reducing Nitrogen losses in the High Rainfall Zone of Victoria

Strategies to reduce Nitrogen (N) losses in Victorian High Rainfall Zone (HRZ) cropping systems are getting clearer. Recent research in south western Victoria examined rates of N applied, placement of fertilisers and nitrification inhibitors. This work is part of the national agricultural nitrous oxide research program, supported by the GRDC. […]

Adding N with Legumes

Mark Peoples from CSIRO talks about recent research, funded by GRDC,  into the value of legume rotations for adding nitrogen (N) to cropping soils, and explains some rules of thumb for growers in the southern region. The work looked at two kinds of legume rotation: pulse crops where the grain […]

What happens to P from crop residues?

Annie McNeill from the University of Adelaide talks about the challenges in understanding what happens to the phosphorous returned to the soil in crop and break crop residues. Recorded at the National Soil Science Conference at the Melbourne Cricket Ground, November 2014. Further information National Soils Conference proceedings: Available P in topsoil […]

Nitrogen volatilised – factors affecting how much is lost

Fertiliser nitrogen may be lost from the soil in several different ways, including: ● ammonia volatilisation, ● nitrate leaching and ● nitrate denitrification. Factors affecting these losses include the fertiliser compound, fertiliser form, type of application, timing of application, soil properties, rainfall amount and intensity, and temperature and wind after […]