Altair Bertonha

Impacto da água residuária de suinocultura no solo e na produção de capim-elefante

ABSTRACT Intensive pig farming concentrates a great number of animals per area generating high volume ofwastewater, which requires correct disposal since it might cause environmental imbalance. Pig farmingwastewater (PFW) can be used as fertilizer due to its characteristics. This study aimed to evaluate the effectof applying pig farming wastewater on chemical properties of Dystric Nitosol and on elephant grass( Pennistum purpureum Schum) production. An experiment was carried out in field conditions consistedof five treatments plus control. T 0 = without PFW application (control), T 1 = 150 m 3 ha -1 , T 2 = 300 m 3 ha -1 ,T 3 = 450 m 3 ha -1 , T 4 = 600 m 3 ha -1 , T 5 = 750 m 3 ha -1 PFW applied during elephant grass crop cycle. P,K + , Mg +2 , Ca +2 concentrations were obtained in the soil before and after PFW application. Phosphorusconcentration in the soil increased as a function of PFW application rates increase. Al +3 concentrationdecreased. PFW application did not influence plant height and dry mass production of the grass.

Estudo exploratório do uso da vinhaça ao longo do tempo: I. Características do solo

The aim of this study was to accomplish an exploratory study of the stillage in the areas with sugarcane, through a comparative and systematic analysis. The present work was conducted in the company USACIGA - Sugar, Alcohol and Electric Power S.A. located at Gaucha, northwest Parana state. Treatments constituted of areas cultivated with sugarcane and submitted to different times of stillage application, respectively 1, 2, 3, 4, 12 and 20 years, and a reference area, without application. In all the studied areas trenches of 1 m3 were opened, geo referenced in 340 m of altitude for accomplishment of the soil classification and sample collection. The evaluations were performed of the density, soil particle density, organic carbon, cation exchange capacity (CEC), total porosity, soil water moisture for the sugarcane, besides the relationships among K, Ca, Mg and V%. The results indicated that the stillage application contributed to the organic carbon and potassium increase in the soil and that the sugarcane productivity presented a direct relationship with the ratio of potassium adsorption increase in the soil.

Estudo exploratório do uso da vinhaça ao longo do tempo: II. Características da cana-de-açúcar

This work was conducted in the Cidade Gaucha PR, with the objective to evaluate the mechanical resistance of soil, the levels of calcium, magnesium, potassium, base saturation in the soil, the roots distribution and yield of sugarcane fertigated with wastewater (stillage) of sugarcane industry for 1, 2, 3, 4, 12 and 20 consecutive years and a control without application. The soil compaction was evaluated with penetrometer cone to 0.50 m depth in intervals of 0.02 m. The results of chemical analysis of soil samples collected between the depths of 0 to 0.20 and 0.20 to 0.40 m were evaluated. The root density was evaluated with the weight of the dry matter of roots with the monolith method retreats to each 0.10 m depths to 0.50 m. The high soil mechanical resistance occurred where wastewater of sugarcane industry was applied for 20 years. The concentration of calcium decreased after two years of application of wastewater, accompanying the fertility of the soils not showing direct connection with the productivity as well as the magnesium. The concentration of the potassium in soil presented linear relation with the productivity. The roots of the sugarcane presented a direct relation with the application time of wastewater of sugarcane industry

Changes in chemical properties of distrophic Red Latosol as result of swine wastewater application

Swine wastewater (SW) has characteristics that allow its disposal in the soil as a fertilizer. This is an alternative in order not to accumulate this material in the farm as well as it provides savings with mineral fertilizers. The aim of this study was to evaluate the effect of applying swine wastewater on the chemical properties of a distrophic Red Latosol for two seasons. The experiment was carried out under field conditions with treatments defined as T0 = 0 (control), T1 = 150, T2 = 300, T3 = 450, T4 = 600, T5 = 750 m3 ha-1 of SW applied during the crop cycle of elephant grass. SW application contributed to the increase of magnesium and phosphorus and the reduction of soil aluminum in the first season. As for the second season when compared to the first one, there were reductions in K, Ca, and P concentrations. Hence applications of SW did not contribute to the increase in concentration of elements in the soil.