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Plant and Soil

, Volume 36, Issue 1–3, pp 109–119 | Cite as

Principles and practice of foliar analysis as a basis for crop-logging in pine plantations

I. Basic considerations
  • B. N. Richards
  • D. I. Bevege
Article

Summary

Principles underlying the use of foliar analysis to diagnose nutrient deficiencies in forest crops are outlined, and the application of foliar diagnosis in crop-logging is discussed. The identification of limiting nutrients and the determination of critical foliar concentrations of deficient elements are prerequisites to the successful introduction of crop-logging as a management tool.

The method proposed involves determining the shape of the response curve by graphical methods, and developing an equation to describe the selected model by means of regression analysis. The optimum nutrient concentration is calculated as the point of zero change in slope of the curve,i.e. where dy/dx=0, and the critical level is taken as the concentration at which a ten percent reduction in yield occurs.

Keywords

Regression Analysis Plant Physiology Nutrient Concentration Response Curve Critical Level 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Martinus Nijhoff 1972

Authors and Affiliations

  • B. N. Richards
    • 1
    • 2
  • D. I. Bevege
    • 1
    • 2
  1. 1.Department of BotanyUniversity of New EnglandArmidale
  2. 2.Department of ForestryForest Research StationBeerwahAustralia

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