Five tips for your early post emergent crop
With winter crops finally starting to emerge, it’s vital that you take time now and lay the foundations for a successful season.
Elders Albury senior agronomist Rob Harrod gives the following tips to give your crops the best possible start:
Test for nitrogen and top dress if required.
Due to global demand and shortages, Urea is now north $700/tonne. Last year humic N (nitrogen supplied from the soil’s organic carbon fraction) generally supplied anywhere between 50 – 80 kg N/ha. Mineral N measured from deep N soil testing supplied anywhere between 40 to 80 kg N/ha. Thus Humic N, when applied with topdressed Urea resulted in large crop yields with reasonable quality cereal grains, given the rainfall.
Don’t expect the same this season. Get your Deep N soil test completed over the next couple of weeks. Aim to get 0 to 30cm and 30 to 60cm below the surface for an average measurement. Ideally you should be looking at the nitrogen, sulfur and organic carbon percentage in the soil.
Control annual ryegrass.
Annual ryegrass (Lolium rigidum) is one of the most serious and costly weeds of annual winter cropping systems in southern Australia so it’s important to eradicate it where possible.
Consider early post emergent application of Boxer Gold in wheat and barley if there has been ryegrass escaping a ‘soft’ pre-emergent program (eg trifluralin.) Boxer Gold can now be used up to 3.0 L/ha on one to three leaf annual ryegrass.
Take care when using clethodim in canola.
Where possible, avoid using during periods of frost, both pre and post application, as it can severely affect its efficacy. In TT canola consider splitting the post emergent application of atrazine and the clethodim. Atrazine has been shown to be slightly antagonistic to clethodim efficacy.
Don’t delay early post-emergent grass control in canola.
Canola seedlings are very tolerant of early post emergent herbicides (with Factor being an exception) that are registered for use. In fact, you can get more damage from a product such as clethodim if it is applied too late past the six leaf stage.
Monitor your seedling canola crops for turnip yellow virus (TUYV).
Cesar Australia have recently detected the turnip yellow virus (TUYV) in aphids across sites in southern New South Wales. In 2014 the virus (then known as beet western yellows virus), caused significant crop losses in some areas. Treat early with appropriate product if necessary.
It’s been a tough start to the season with dry weather, frosts and mice challenges. But remember – it’s generally better to have less canola plants sown early (in their correct window) than to have more plants sown late. So, where required, get the nitrogen applied as soon as possible and get your crops moving!
Elders offers a range of crop protection products.
For advice specific to your crop speak to your local Elders agronomist.