Phosphorus

  • Quick test for safe rates of seed-placed fertilizer

    Phosphorus

    A quick test for the safety of seed-placed fertilizer is to turn off the fertilizer feed for about 100 feet, mark the spot, and go back and compare stand establishment in treated and untreated areas.

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  • Timing and depth for fall fertilizer

    Phosphorus

    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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  • Need to know: Phosphorus (P)

    Phosphorus

    Canola removes more phosphate than other crops, and studies show that phosphate fertilizer rates have lagged crop removal for years. The result, says soil fertility expert Ross McKenzie, is that about 80% of Prairie fields are deficient in phosphorus.

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  • Top 10 highlights from canoLAB 2016

    Phosphorus

    1. With phosphorus, ultimately the form you apply is less important than the amount you apply. Crop nutrition specialist Rigas Karamanos used the graph below to show the chronic under-application of P year after year.

    Red diamonds indicate Prairie-wide P deficit. Yellow bars are amounts removed each year. Orange are amounts applied. Source: Rigas Karamanos

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  • Scout for nutrient deficiency

    Phosphorus

    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

    Phosphorus

    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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  • Are we mining soil phosphorus?

    Phosphorus

    Phosphorus removal

    Phosphorus fertilizer rates have, pretty generally, lagged crop removal for some time. As crops remove the soluble phosphorus in the soil, the soil’s large reserve of less soluble forms will transfer some more phosphorus into the available “labile” pool. However, this labile pool may be losing its ability to keep up, resulting in a “hidden hunger” for phosphate in many crops in western Canada.

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  • Make the most of your fertilizer investment

    Phosphorus

    The 4 Rs, as described by the Canadian Fertilizer Institute and other crop nutrition organizations, are the right fertilizer source at the right rate, at the right time and in the right place. The 4 Rs will help you make the most of your fertilizer investment.

    Here are the three basics of canola crop nutrition…

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  • Seed-place ammonium phosphate only

    Phosphorus

    The bottom line for seed-placed fertilizer in canola:
    1. Apply plant available sources of nutrients.
    2. Place a modest rate of P in the seedrow. At rates over 20 lb./ac., the salt component in MAP, for example, can start to set back seedling survival.
    3. Place N and S in a band away from the seed.

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  • “Hidden hunger” with P deficient soils

    Phosphorus

    A 50-bushel crop can remove more than 50 pounds of P205 per acre. Growers using only seed-placed phosphate at a rate of 15 pounds per acre can slowly deplete the soil of phosphate. That can start to affect yield potential on the field over time. These plants, demonstrated at CanoLAB, were seeded the same day in a greenhouse and fed hydroponically to demonstrate extreme P deficiency. The potting mix has no nutrient value. The large plant received required levels of P. The tiny plants in front received no P.

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