Potencial de produção da terra preta de índio submetida a cultivos sucessivos de milho e feijão caupi.

Abstract

The soils called Anthi-opogenic Dark Earths (ADE), or simply Anthropogenic soil have aníliropogcnic A horizon generally has high leveis of nutrients, especially P, in comparison with most upland soils in the Amazon, which have low natural fertility, given the nature of thc source material and training processes. The objective was to evaluate the potential of ADE subjected to successive crops of maize (Zea mays L.) and cowpea (Vigna unguiculata (L.) Walp.) using as reference an Oxisol typical. The experimental design was completely randomized in a factorial arrangement of 2 x 12, with treatments twelve (fertilization and complete omission of a nutrient at a time) and two soils (ADE and Oxisol) with three replications. We used four successive crops of maize and cowpea, two plants per pot, with a capacity of 5 kg of soil. Com the cowpea grown in succession when the ADE produced more dry matter and grain production (only cowpea). The most limiting nutrient in the ADE for the cultivation of maize and cowpea in succession was the K. Oxisol presented as major constraint for production of the nutrients P and Ca in both corn crops as cowpea. The highest leveis of nutrients in maize and cowpea were found in the ADE when compared to Oxisol.