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Critical Leaf Potassium Concentrations for Yield and Seed Quality of Conservation-Till Soybean

^a Dep. of Agronomy, Iowa State Univ., Ames, IA 50011-1010
^b Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907-2054

View larger version (16K): [in a new window]   Fig. 1. A quadratic-plateau fit of relative soybean seed yield and leaf K concentration for all treatments across the nine site-years. This quadratic equation applies only for X values less than the critical value at which the two portions (quadratic and plateau) of the model join.

View larger version (17K): [in a new window]   Fig. 2. A quadratic-plateau fit of relative soybean seed K concentration and leaf K concentration for all treatments across the nine site-years. This quadratic equation applies only for X values less than the critical value at which the two portions (quadratic and plateau) of the model join.

View larger version (16K): [in a new window]   Fig. 3. A quadratic-plateau fit of relative soybean seed oil concentration and leaf K concentration for all treatments across the nine site-years. This quadratic equation applies only for X values less than the critical value at which the two portions (quadratic and plateau) of the model join.

View larger version (17K): [in a new window]   Fig. 4. A quadratic-plateau fit of relative soybean seed isoflavone concentration and leaf K concentration for all treatments across the nine site-years. This quadratic equation applies only for X values less than the critical value at which the two portions (quadratic and plateau) of the model join.