Maize is the most important crop in Mexico, being central to diets of consumers, particularly smallholders, and an undetermined amount allocated as straw, green fodder, and, a lesser extent, silage for animal feed. Nitrogen fertilizer considered one factors affecting growth, grain yield, maize biomass production. In this context, main objective study was evaluate effects different levels nitrog...

Expansion of the categorical point of view on many areas of the mathematics and mathematical physics will cause to deeper understanding of genuine features of these problems. New applications of categorical methods are connected with new additional structures on categories. One of such structures, the double category, is considered in this article. The double category structure is defined as ge...