REFERENCE SUFFICIENCY RANGES
FIELD CROPS

Peanut

C. R. Campbell and C. O. Plank

• Critical Values

  None reported.

• Sampling Procedures

  All Growth Stages
  The most recent mature trifoliate (MRMT) is the best indicator sample. A total of 15 to 20 trifoliates are required for a representative sample.

  Problem-solving Samples
  These samples can be taken at any time during the growing season. Comparative samples from "good" and "bad" areas should be taken according to above guidelines.

  Monitoring Samples
  These samples should be taken just prior to last opportunity to get through the field so that corrective action can be taken. Final monitoring samples should be taken at bloom.

• Sufficiency Ranges
  
  
  • All Growth Stages
    
    

    Macronutrients
    N	P	K	Ca	Mg	S
    3.5–4.5%	0.2–0.5%	1.7–3.0%	0.5–2.0%	0.3–0.8%	0.2–0.35%

    
    

    Micronutrients
    Fe	Mn	Zn	Cu	B	Mo
    50–250 ppm	20–350 ppm	20–60 ppm	5–20 ppm	20–60 ppm	0.1–5.0 ppm

    
    

    Important Ratios

    Ca:Zn ratios less than 45–50 indicate zinc toxicity.

• DRIS Norms

  DRIS norms have not been reported for peanuts.

• Remarks

  Sufficiency ranges are based on available literature and extensive experience interpreting plant samples.

  Zinc toxicity is a significant problem and occurs when zinc concentration approaches 200 ppm. Zinc toxicity is usually associated with low pH and extensive municipal or animal waste application.

• References

  Mills HA, Jones JB Jr. 1996. Plant analysis handbook II: a practical sampling, preparation, analysis, and interpretation guide. Athens (GA): Micro-Macro Publishing.

  Plank CO. 1989. Plant analysis handbook for Georgia. Athens (GA): University of Georgia Cooperative Extension Service. p 21–8.

Electronic Document Prepared by:
Catherine Stokes, Communication Specialist
Agronomic Division of the N.C. Department of Agriculture and Consumer Services. July 2000.