Chemical attributes of a Hapludox soil after nine years of pig slurry application

Abstract

-The objective of this study was to evaluate the pig slurry application effects on chemical attributes of a Hapludox soil managed under no-tillage system. Treatments consisted of 50, 100 and 200 m 3 ha -1 per year of pig slurry application, and a control with replacement of P and K exported through harvested grains. Attributes related to soil chemical reaction, exchange complex, and nutrient contents were determined in soil samples collected in the ninth year of experimentation from 0-0.025, 0.025-0.05, 0.05-0.10, 0.10-0.20, 0.20-0.40 and 0.40-0.60 m soil depths. The continuous application of high doses of pig slurry on the Oxisol surface under no-tillage acidifies the soil and increases Al, P, Cu, and Zn contents down to 0.2-m depth, and K levels down to 0.6-m depth.Index terms: acidification, micronutrients, no-tillage system, soil fertility, soil pollution, soil quality. Atributos químicos de um Latossolo Vermelho após nove anos de aplicação de dejeto líquido de suínosResumo -O objetivo deste trabalho foi avaliar os efeitos da aplicação de dejeto líquido de suínos sobre os atributos químicos de um Latossolo Vermelho, sob sistema de plantio direto. Os tratamentos consistiram da aplicação de 50, 100 e 200 m 3 ha -1 por ano de dejeto líquido de suínos, e de um controle, com reposição das quantidades de P e K exportadas nos grãos colhidos. Os atributos relacionados à reação química do solo, ao complexo de troca do solo e aos teores de nutrientes foram determinados em amostras de solo coletadas no nono ano de experimentação, a 0-0,025 e 0, 025-0,05; 0,05-0,10, 0,10-0,20, 0,20-0,40 e 0,40-0,60 m de profundidade do solo. A aplicação contínua de altas doses de dejeto líquido de suínos na superfície de Latossolo Vermelho em sistema plantio direto acidifica o solo e aumenta os teores de Al, P, Cu e Zn, a 0,20 m de profundidade, e os de K a 0,60 m de profundidade.Termos para indexação: acidificação, micronutrientes, sistema de plantio direto, fertilidade do solo, poluição do solo, qualidade do solo.

Soil chemical properties and maize yield under application of pig slurry biofertilizer

“…According to the authors, the levels of available Cu and Zn in the 0-0.10 m soil layer of the treatment with the highest rate of organic fertilizer were, on average, 12 and 24 times higher, respectively, than in the control. Veiga et al (2012) found that continuous application of high pig slurry rates, up to 200 m 3 ha -1 yr -1 on the soil surface, resulted in sharp increases in P, Cu and Zn concentrations to a depth of 0.2 m. These authors also reported a reduction in soil pH with the application of organic fertilizer, and attributed it to the acidification process of nitrification.…”

“…There are several reports in the literature of increased levels of soil nutrients after pig slurry application under field conditions (Ceretta et al, 2003;Scherer et al, 2010;Girotto et al, 2010;Veiga et al, 2012). However, these studies used organic fertilizers with a higher dry matter content compared with the biofertilizer used in this experiment.…”

“…Several reports in the literature mention improvements in soil fertility and increases in crop yields when using pig slurry as organic fertilizer, without having gone through biodigestion (Ceretta et al, 2003;2005;Scherer et al, 2010;Lourenzi et al, 2014). However, successive applications of this organic fertilizer can promote excessive increases in P, Cu and Zn in soil, posing a potential contamination risk of soil and surface and subsurface water bodies Girotto et al, 2010;Veiga et al, 2012).…”

Effects of pig slurry application on the diversity and activity of soil biota in pasture areas

“…Since the sequential addition of pig slurry may contribute to the improvement or maintenance of some chemical (VEIGA et al, 2012) and physical characteristics of the soil (AGNE & KLEIN, 2014) and increase the availability of food for the soil fauna owing to the addition of large quantities of organic compounds, an increase in the density of organisms in the soil is to be expected. Thus, with adequate management and dosage, pig slurry may contribute to increased soil quality, promoting ecological equilibrium by reusing agricultural waste without polluting the environment (ALVES, 2008).…”

Crop yield and nutrient balance influenced by shoot biomass management and pig slurry application

“…The application of pig manure as slurry (PS) increases the levels of N, P, K, Ca and Mg in the soil (Scherer et al, 2007;Veiga et al, 2012b) and in the crops (Choudhary et al, 1996;Cassol et al, 2012;Sartor et al, 2012;Scherer et al, 2012). Due to the low content of nutrients present in this manure (Scherer et al, 1996), the use of large volumes is usually necessary to provide enough amounts of plant nutrients.…”