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Nutritional Diagnosis in Carob-Tree

Relationships between Yield and Leaf Mineral Concentration

^a FERN, Univ. do Algarve, Campus de Gambelas 8000-117 Faro, Portugal
^b AIDA Loteamento Industrial de Loulé, Apartado 302, 8100 Loulé, Portugal
^c Direcção Regional de Agricultura do Algarve, Serviços de Apoio, Largo de Sto Amaro 8800 Tavira, Portugal
^d Dep. de Biologia Vegetal, Faculdade de Ciências de Lisboa, Campo Grande, C2 Piso 4, 1749-016 Lisboa, Portugal

View larger version (18K): [in a new window]   Fig. 1. Regressions between carob-tree yield and leaf N (A), K (B), and P (C).

View larger version (19K): [in a new window]   Fig. 2. Regressions between carob-tree yield (kg ha-1) and leaf Mn (A), Zn (B), and Fe (C).

View larger version (23K): [in a new window]   Fig. 3. Regression between observed and estimated carob-tree yield obtained by the six-parameter model presented in Table 4. Standard errors of the means are shown for both variables. Fertilization regimes used in the validation trial are: N (solid circles); K (open triangles); N plus K (solid squares); and unfertilized control (open circles). Upper and lower limits for the observed yield are represented by two dashed lines. Both lines were obtained by regression analysis.