Does addressing soil constraints change crop nutrition requirements? DAFWA researcher Craig Scanlan runs field trials in central and northern WA. The trials investigate links between soils, seasons and crop nutrition. The focus is how incorporating lime affects yield response to fertilisers. Soil mixing to treat water repellent soils is also […]
A hayed-off crop can make estimating available nitrogen (N) trickier than usual. Deep N testing is the best way to assess N resources.Estimates and actual results from deep soil testing were very different in recent research by Birchip Cropping Group.
After haying off there’s potential yield benefit next season from leftover nitrogen. […]
Mungbeans growing in cereal stubble. GRDC
Some rain around Australia’s northern region saw some last minute mungbean crops go in.
The GRDC Mungbean Grownotes suggests we base fertiliser recommendations on:
soil test results
That’s comprehensive, but with an opportunity crop there’s not always the chance to cover all the bases. […]
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 […]
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 […]
Good P supply through the root zone can improve crop growth. Placing some P fertiliser deeper into cropping soils can help supply the needs of maturing crops. Where subsoils are low in P, deep placing P can deliver yield gains.
Looking closer at the roots
Researchers in northern NSW and southern QLD […]
After a year with failed crops due to drought, it’s not ‘business as usual’ for the next season’s inputs. Some fertiliser nutrients can remain in the soil if they weren’t taken up by the crop. Demand for other nutrients can increase after drought.
Key nutrients after a tough year