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The Phosphorus Compositional Nutrient Diagnosis Range for Potato

Lotfi Khiaria, Léon-Étienne Parent*,a and Nicolas Tremblayb

a Dep. of Soil Sci. and Agri-Food Eng., Laval Univ., Paul-Comtois Building, Sainte-Foy, QC, Canada G1K 7P4
b Hortic. Res. and Dev. Cent., 430 Gouin Blvd., St-Jean-sur-Richelieu, QC, Canada J3B 3E6



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  		Fig. 1. Comparison between the chi-square cumulative function and the Compositional Nutrient Diagnosis (CND) r2 distribution function to obtain the theoretical threshold CND r2 value (4.2) at yield cutoff in the survey population (n = 563).

 


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  		Fig. 2. Theoretical relationship between tuber yield goal and the chi-square value.

 


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  		Fig. 3. Relationship between the Compositional Nutrient Diagnosis (CND) nutrient imbalance indexes (CND r2) or the Diagnosis and Recommendation Integrated System (DRIS) nutrient imbalance index (DRIS NII) and tuber yield in the validation population (n = 100) as indicated by the variance method of the Cate–Nelson procedure (R2 of the partition between two classes).

 


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  		Fig. 4. Relationship between the Compositional Nutrient Diagnosis (CND) or Diagnosis and Recommendation Integrated System (DRIS) P indexes or P concentration and tuber yield across four P fertilizer trials.

 




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