Diagnostic techniques for cereals based on plant analysis III. Nutrient element therapy and correction models

Abstract

Abstract Quantitative methods as the basis to predict the amount of nutrient to be supplemented to overcome deficiency, diagnosed by using the diagnosis and yield prognosis models, are defined as “Therapy Models.”; These models are developed based on the relationships, at 2.0 g Dry Matter weight (DMw) per hill, of increasing concentration as a function of varying initial concentration of a topdressed nutrient element for varying levels of topdressing, and changes in the concentration of other nutrient elements as a function of increasing concentration of topdressed nutrient. Nitrogen and K therapy models were developed in this study and the procedure for applying these models discussed. Correction models were developed for N, P and K as an aid to convert the concentrations of these nutrient elements corresponding to the DHw level at sampling to those at the 2.0 g DMw level. This conversion is necessary for the application of diagnostic models on the results of plant analysis.