Precautions in identifying nutrient stress symptoms

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  1. Many symptoms appear similar. For instance, N and S deficiency symptoms can be very alike, depending upon plant growth stage and severity of deficiencies.
  2. Multiple deficiencies and/or toxicities can occur at the same time. More than one deficiency or toxicity can produce symptoms, or possibly an abundance of one nutrient can induce the deficiency of another (e.g. excessive P causing Zn deficiency).
  3. Crop species, and even some cultivars of the same species, differ in their ability to adapt to nutrient deficiencies and toxicities. For example, corn is typically more sensitive to a Zn deficiency than barley and will show Zn deficiency more clearly.
  4. Pseudo (false) deficiency symptoms (visual symptoms appearing similar to nutrient deficiency symptoms). Potential factors causing pseudo deficiency include, but are not limited to, disease, drought, excess water, genetic abnormalities, herbicide and pesticide residues, insects, and soil compaction.
  5. Hidden hunger. Plants may be nutrient deficient without showing visual clues.
  6. Field symptoms appear different than ‘ideal’ symptoms. Many of the plants shown in this module as photographs were grown under controlled nutrient conditions, and deficiency/toxicity symptoms observed in the field may or may not appear as they do here. Experience and knowledge of field history are excellent aids in determining causes for nutrient stress.

Why Measure PH

Why Measure PH

pH is a scale that chemists use to measure acidity. Values < 7 are considered acidic Read More...

pH is a scale that chemists use to measure acidity. Values < 7 are considered acidic, values > 7 are alkaline and 7 is neutral. Most plants can tolerate a wide pH range in solution culture, but they cannot tolerate a wide range of acidity in the soil... Read More...

 

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