Sulphur

  • How late can you top dress fertilizer?

    Sulphur

    The ideal time for a sulphur top up is any time before flowering, but a top up at early flowering may pay off if plants are showing signs of sulphur deficiency. The ideal time for a nitrogen top up is before the 5-leaf stage of canola, but AAFC research out of Indian Head, Saskatchewan, shows that nitrogen top dress as late as 5-10% flower can still provide a yield benefit.

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  • Top dress tips for nitrogen and sulphur

    Sulphur

    Western Canada has a short growing season. Crops in Western Canada start to take up nutrients early and uptake escalates quickly. For these reasons, the ideal timing for fertilizer application is at seeding. This saves an extra pass over the field and ensures that the expected fertilizer requirement is in place when the crop needs it. But there are times when an in-crop top up of nitrogen or sulphur makes sense.

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  • Fertilizer top dress: 2 questions

    Sulphur

    We had two questions in the past week about top-dressing fertilizer after seeding.

    1. How early is too early to top dress?
    2. Does adding S stabilize N against losses?

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  • Light-coloured petals: Sulphur or something else?

    Sulphur

    Sulphur deficient flowers on the right, normal on the left.

    Canola Watch had a question this week about light-coloured petals and what can cause them. The field in question had large unruly patches of light-coloured flowers, indicating it was likely related to soil. Sulphur deficiency seems the most obvious but other causes must be ruled out first.

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  • When you see something new

    Sulphur

    Mystery symptoms 2016. Credit: Warren Ward

    Before spending money on a treatment, growers will need to identify the cause. The Canola Diagnostic Tool can help you work through the possibilities. A few localized tests can also help with the diagnosis….

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  • Need to know: Sulphur (S)

    Sulphur

    Sulphur deficiency stem leaf cupping

    Growers understand the need for S in canola, but more frequent production of canola and higher yields have been drawing down soil levels. Soil fertility expert Ross McKenzie estimates that at least 40% of soils across Western Canada are S deficient.

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  • Scout for nutrient deficiency

    Sulphur

    This diagram from IPNI shows where deficiency symptoms are likely to show up on a plant. Nitrogen is mobile so with N shortage, plants will move N to new parts of the plant. Therefore deficiency will show up first in older leaves.

    This diagram from IPNI shows where deficiency symptoms are likely to show up on a plant. Nitrogen is mobile, so with an N shortage, plants will move N to new parts of the plant. Therefore deficiency will show up first in older leaves.

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  • 3 fertility questions for seeding time

    Sulphur

    The key with fertility decisions is to apply all of the 4 Rs — right fertilizer source at the right rate, at the right time and in the right place. Missing even one R reduces the yield response from the fertility investment. Make the most of your fertilizer investment. At the CanoLAB fertility station, attendees […]

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  • Sulphur forms: Which to use and when?

    Sulphur

    Sulphur deficient flowers on the right, normal on the left.

    Canola has a high demand for sulphur. Because of high sulphur variability across most fields, the common recommendation is to apply 10-15 lb./ac. of sulphur when soil test results show adequate levels and 20-25 lb./ac., or more, when tests show deficient levels. Read more for product options and when to use them.

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  • How late can you top dress?

    Sulphur

    This graph shows nutrient uptake for canola. Having fertilizer in the root zone before peak uptake is the goal.

    Sulphur and nitrogen deficiencies are showing up in some canola crops. The crop may not have received enough fertilizer to begin with, especially if this year’s rates did not compensate for high yields and high removal last year. Excess moisture may have added to nutrient losses.

    Flowering is not an ideal time to top dress, and applications any time after early flowering may not provide an economic benefit. Late fertilizer needs to be applied to the soil surface and get a rain to move it into the root zone quickly for any chance of an economic benefit this year.

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