Stonemeal of amazon soils with sediments from reservoirs: a case study of remineralization of the tucuruí degraded land for agroforest reclamation

Abstract

This study suggests the employment of accumulated sediments in the reservoir of Tucuruí (Pará /Brazil) to remineralize the surrounding degraded soils. The approach was based on the principles of stonemeal technology. It suggests that the soil can be rejuvenated by crushed rocks rich in macro and micronutrients. Removal of the sediments for agricultural use will bring benefits to family farmers and increase the life cycle of the reservoir and, therefore, energy generation. Geochemical data on retained sediments, soils and rocks in the area of influence of the reservoir were evaluated regarding nutrient transport mechanisms and soil-fertility potential. Results show that sediments from the reservoir contain nutrients levels at least one order of magnitude greater than average Amazon region soils. Our data on soil use and occupation in the region show the degradation areas which could be recovered by stonemeal techniques. Thence, an Agroforestry System was installed, with 12 plots where different mixtures of sediments removed from the reservoir were used, along with crushed rock with or without the addition of NPK and manure. The experiments showed that maximum crop yield and plant growth were attained in the plots where a mixture of sediments, crushed rocks and manure were added.

Characterization of Ornamental Rock Residue and Potassium Liberation Via Organic Acid Application

“…While evaluating an agroforestry system, Theodoro et al (2013) used sediments that accumulated in the Tucuruí water reservoir (Pará, Brazil) to remineralize degraded soils of its surroundings together with crushed rock with or without the addition of NPK and organic compost. Their studies showed that greater plant growth and productivity were obtained in the portions where a mixture of sludge, ground rock and organic compost was added.…”

Viabilidade técnica do uso de gesso reciclado da construção civil como insumo agrícola

“…É importante destacar que a disponibilização ou solubilização dos nutrientes derivados desses materiais é mais lenta do que os fertilizantes químicos solúveis, mas está aparente desvantagem é compensada com uma disponibilização por períodos de tempo mais longos (slow-release). Por isso, são considerados "fertilizantes inteligentes" (Theodoro, et al, 2013).…”

Efeitos da Aplicação do Pó de Rocha em Argissolo Sobre o Crescimento de Alface

“…A exploração, através da mineração, destas formações acaba gerando uma elevada quantidade de subprodutos, que sem uma real utilização tornam-se resíduos. Visando um consumo consciente, é de extrema importância encontrar finalidades a estes (Theodoro, et al, 2013).…”