Fertility

  • Fertility planning: Safe seed-placed rates

    Fertility

    What are safe seed row fertilizer rates for phosphorus (P), sulphur (S) and nitrogen (N)? With lower seeding rates than in the past, this concern is greater than ever. Growers need to keep all seed viable to hit plant population targets. Therefore, the best practice is to put up to 20 lb./ac. of phosphate (max 40 lb./ac. of MAP) in the seed row – if P is needed – and put all other fertilizer in a band outside the seed row.

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  • How much fertilizer does canola need?

    Fertility

    Canola generally needs nitrogen, phosphorus and sulphur fertilizer each year. A small percentage of fields will also benefit from a potassium application. The following article suggests what canola needs and what soil and crop residue could provide. The rest will come from fertilizer.

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  • PLAN fertilizer over the winter, don’t APPLY it

    Fertility

    Winter is a great time to review yield results, fertilizer rates and potential fertilizer shortcomings evident over the growing season. Winter provides the time to look at soil test results from the fall (and even sample fields that weren’t done sooner – albeit with specialized equipment for frozen soil) and make plans to pre-buy and maybe even take delivery of fertilizer – if the farm is set up for that.

    But winter is not the time to apply fertilizer.

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  • Fall soil sampling: The early option

    Fertility

    Closer to freeze up is best time to capture soil test results that more closely resemble the situation next spring. BUT…sampling soon after combining may satisfy a number of other issues: (1) That is the only time you can get the custom soil-sampler. (2) You want test results in time to make fall fertilizer applications. (3) You want to see if harvest-time soil nutrient levels could explain lower- or higher-than-expected yields this year.

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  • Timing and depth for fall fertilizer

    Fertility

    Fall fertilizer is best applied as close to freeze up as possible to balance two objectives: (1) allow soil to seal over the band and (2) reduce losses due to high microbial activity in warm soils.

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  • Early fall soil tests and fertilizer applications

    Fertility

    Some growers are already doing soil tests and making fall fertilizer applications. While this may not be the ideal timing for soil tests of fertilizer applications (closer to freeze up is better), this timing may satisfy a number of other issues, including custom soil-sampler availability, wanting test results before fall application, and checking to see if current soil nutrient levels could explain lower- or higher-than-expected yields this year.

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  • Boron and other micronutrients: Economic results are rare

    Fertility

    When well-designed research studies are done for micronutrients in canola, results show little if any economic benefit.

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  • The right time for fall soil tests

    Fertility

    For results to be as close as possible to the situation next spring, the ideal time to take fall samples is when soil temperatures drop below 10°C and as close to freeze-up as possible.

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  • Top dress tips for nitrogen and sulphur

    Fertility

    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

    Fertility

    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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Canola Watch