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Crop Nutrition – Manitoba Pulse & Soybean Growers

Crop Nutrition

Peas biologically fix 55% of their N requirement, on average. This means N fertilizer is generally not required.

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Resources

Fertility

Peas biologically fix 55% of their N requirement, on average. This means N fertilizer is generally not required. N rates commonly applied with starter fertilizer blends (<15 lbs N/ac) may improve early growth before nodules begin fixing N, particularly on cold soils with low soil N reserves. Higher N rates can inhibit nodule development and N fixation.

Starter phosphorus (P) fertilizer has been shown to increase pea yields even on high P soils. Maximum seed-row safe rates are 20 lbs P₂O₅/ac with seed bed utilization (SBU) >15%. P fertilizer should be placed away from the seed-row with lower SBU. Potassium and sulphur fertilizers, necessary only on low testing soils, should be applied away from the seed-row as they cause more seed toxicity than P fertilizer.

Inoculant

Inoculate peas with Rhizobium leguminosarum bacteria, even on fields with a history of peas, to facilitate root nodule development and biological nitrogen (N) fixation.

Consider double inoculating fields with no history of peas or using a granular inoculant when seeding conditions are unfavourable (drought, excess moisture or acidic soils).

Inoculation strategies in peas are currently being investigated through the On-Farm Network, comparing single vs. no inoculation.

Resources

  • Assessing Field Pea Nodulation

    Timing Field pea root nodules can form as early as 14 days after emergence. However, proper nodulation assessment should take place from the 6th to… Read More

  • Field Pea Inoculation and Fertilization

    Is inoculation necessary for peas? Field peas can fix atmospheric nitrogen (N2) through a symbiotic relationship with Rhizobium leguminosarum. This bacteria is native to prairie… Read More