Atributos de solo sob pastejo rotacionado em função da aplicação de cama de peru

Abstract

Adições de dejetos de aviário podem promover melhorias nos atributos biológicos, físicos e químicos do solo. O presente estudo objetivou avaliar os efeitos de doses sequenciais de cama de peru nos atributos de solo sob pastejo rotacionado com Brachiaria decumbens L., em Portelândia (GO). O delineamento utilizado foi em blocos casualizados, em esquema de parcela subdividida, com quatro repetições. Os tratamentos alocados nas parcelas foram doses de cama de peru [ausência de adubação; 8,7 Mg ha-1 (2008); 16,5 Mg ha-1 (2008 + 2009); 30,9 Mg ha-1 (2008 + 2009 + 2010)], sendo que as duas maiores doses resultaram do acúmulo das aplicações de dejeto. Como subparcelas, foram consideradas as profundidades amostradas (0-5 cm, 5-10 cm e 10-20 cm). Aplicações sequenciais de cama de peru promoveram melhorias na fertilidade do solo, com aumento de pH, P, K, saturação por bases e estoque de carbono orgânico, nitrogênio total e particulado e diminuição na saturação por alumínio. A aplicação de menores doses de cama de peru estimulou a atividade microbiana do solo, promovendo a mineralização da fração particulada da matéria orgânica, porém, não houve efeito na agregação do solo.

Changes in a Rhodic Hapludox under no-tillage and urban waste compost in the northwest of Rio Grande do Sul, Brazil

“…A positive linear relationship between NT and UWC rates, as observed in this study, agrees with the results reported by Pinto et al (2012). However, these authors found that different levels of turkey litter waste did not affect soil aggregation.…”

“…A reduction of the amounts of water-stable aggregates retained on the sieve of 8.00-4.76 mm for UWC rates above 50 m 3 ha -1 (second year of assessment) was also observed with application of high rates of other organic sources, such as alkaline residues from the pulp and paper industry (Medeiros et al, 2009), pig slurry (Arruda et al, 2010), vinasse from sugarcane (Passarin et al, 2007), and turkey litter (Costa et al, 2008;Pinto et al,. 2012).…”

“…Matos et al (2008) observed increases in SOC contents over time with the use of organic fertilizer (common bean and soybean straw + cattle manure). However, Pinto et al (2012) found that the soil carbon stock of an Oxisol varied in a quadratic manner in relation to the increased application of waste from turkey litter. Moreover, Arruda et al (2010) observed that SOC contents were not influenced by the addition of pig slurry.…”

Biochar, farmyard manure and poultry litter on chemical attributes of a Distrophic Cambissol and soybean crop

“…The residual increase of potassium, by the poultry litter use, can be related to the concentrations of this nutrient, 1.9 and 14.2 times higher in relation to the farmyard manure and biochar, respectively (Table 1). Pinto et al (2012) also found increments of potassium levels into soil, through sequential application of turkey litter in a rotational grazing system in the Brazilian Savanna.…”

“…In spite of the lower contribution of nutrients per volume, organic amendments, such as bovine manure and poultry litter might even be superior to the mineral fertilizers, improving the biological, physical and chemical attributes of the soil (Bhattacharyya et al, 2010). Evaluating the effects of several applications of organic wastes, such as the turkey litter, over the years, Pinto et al (2012) found improving on soil fertility, increasing the pH, N, P, K, and base saturation rates, as well as organic carbon, and decreasing aluminum saturation.…”