Potato Plant Nutrition For Growers
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Nitrogen

We invite you to view our potato nitrogen video, in it we discuss in greater detail information regarding nitrogen functions, nitrogen uptake, utilization and timing.

Nitrogen Accumulation in Units/Acre in Relation to Yield

Tons/Ac 15 dae 30 dae 45 dae 60 dae 75 dae 90 dae 105 dae 120 dae
25 16 87 194 233 266 265 254 246
30 19 104 233 280 319 318 305 296
35 23 121 272 327 372 371 356 345
40 26 139 311 373 425 424 406 394

Approximately eighty percent (80%) of the nutrient dry matter content of potatoes is nitrogen (≈43%) and potassium (≈36%).  These two nutrients play an important role in plant development and yield potential.  Nitrogen is important for plant growth, health and yield potential; but improper timing and rates of nitrogen application and availability can also cause a reduction in yield potential.  We will be adding more nitrogen monitoring and application information to this site soon.

Nitrogen Facts

Nitrate N – GROWS a plant

  • The plant continually absorbs nitrate as long as it exists in the soil
  • Nitrate uptake can be depressed by ammonia
  • An anion (NO3) is needed to increase uptake of important cations like K
  • Nitrate uptake decreases as the soil pH goes above 6.0.
  • High Nitrate Suppresses P & S

Ammonia N – GREENS a plant

  • Ammonia is toxic to a plant unless it is taken up with a carbon source to make an amino acid
  • Ammonia requires carbon; uptake takes energy (carbon)
  • Plants high in ammonia uptake tend to be shorter that high in nitrate uptake
  • Ammonia N uptake is optimal at neutral pH and lower in acidic pH soils
  • High ammonia suppresses K, Ca & Mg

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Contact Us

Midwest
Bruce Andersen
(608) 354-1123
bruce@biogro.com

West
Peter Aleman
(509) 894-4110
peter@biogro.com

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