Mathematical models of population growth have been constructed to provide an abstract of some significant aspect of true ecological situation. In this paper, we put some models where the parameters of the biological growth model systematically change over time. Verhust (1838) first proposed three-parameter model for the growth of single-species populations [1,5,9] that shows a logistic sigmoid ...

Food security is a global challenge embedding complexities including social, economic and environmental fronts. Food security has to be achieved on the quantitative and qualitative level reflected by food availability, food access, food use and their stability. As a result, food security is overlapped to agricultural systems including food production, processing, distribution, retails, delivery...