Abnormal forms of the response "Fertilizer - productivity": field experiments and simulation analysis
Modeling of so called “function of productivity (FP)” (where yield is a function of several factors, and of fertilizer doses, in particular) is one of the oldest and still actual problems of agrochemistry. Until the present moment there was ignored the fact that in some experiments one can observe abnormal type of FP (such charts have intermediate plateau or decline prior to the maximal value). The first attempt to explain the abnormal FP was made on the basis of computer experiments with dynamic crop model AGROTOOL v3.5 designed in the Research Institute of Agrophysics, the results are discussed in the article.