Soil sampling paddocks with a history of precision placement of fertilizer requires special planning. Some elements, such as soil P, remain very close to where they were placed in the soil. Random sampling could give falsely high or low test results depending on how the sampling pattern intersects with the placement […]
Making fertiliser decisions can be difficult. Paddocks in the HRZ have high yield potential. Actual yields often fall short even in high input cropping systems.
Fertiliser decisions in the HRZ:
Under-fertilising appears to be a major cause of yield gaps in the HRZ.
You get the best return on nitrogen (N) investment with […]
Critical soil nutrient levels indicate whether a yield response to fertiliser is likely – or not. Their role is to help avoid unnecessary or uneconomic applications of fertiliser. Critical levels are used in interpreting soil test results to make fertiliser recommendations.
The critical level is the value required to achieve […]
ExtensionAUS™ is bringing “Ask an Expert” to the 2018 GRDC updates.
Nutritional legacies from 2017 and implications for 2018.
Senior crop nutrition experts Mike Bell (QAAFI), Mark Peoples (CSIRO), Nikki Seymour (DAF QLD), Richard Daniel (NGA), Jim Laycock (Incitec Pivot), Ehsan Tavakkoli (NSW DPI), and Tim Weaver (CSIRO) will discuss the […]
Lab tests help advisors with fertiliser and soil amendment planning. Without lab tests, crop nutrition can be a ‘best guess’. Returns from fertiliser inputs might not be optimal. Yields could suffer.
Soil, plant tissue, and grain testing can guide crop nutrition throughout the season. Soil tests indicate crop available nutrient levels […]
Soil testing informs crop nutrition decisions. Collecting representative samples is the most important step in getting useful information.
Plan your soil sampling
Map non-uniform paddocks into zones. Base the zones on observed soil differences (or EM38 maps if available), and sample them separately.
Use a sampling plan within zones. Grids, zig […]
Nutrients leave the paddock with the grain. A good yield means more nutrients go out and less remain in the soil. Some nutrients may need topping up to maintain yields.
How much topping up?
Different grains contain varying amounts of nutrients. The table below gives estimates of the nutrients removed in […]
Trials looking at placing nitrogen fertiliser into the soil have shown some different outcomes. In the southern region adding mid-row banding (MRB) to the crop nutrition toolkit looks interesting. A trial showed modest yield gains and better fertiliser uptake. In the northern region, rate looks more important than how nitrogen […]
Tillage can redistribute phosphorus (P) within the top 10 cm of the soil. P often becomes concentrated at the soil surface, especially in no-till paddocks. Getting P deeper into the soil is important in dry seasons when the active root zones are deeper.
Trials tested the response of wheat to P […]
Take a look at our five most popular articles and videos from 2017.
This year we published 60 articles on www.extensionAUS/Crop Nutrition These articles covered many different aspects of crop nutrition in the Australian grains industry.
These articles were prepared with and reviewed by, members of our Community of Practice, Australia’s […]