Sandra Maria Campos Alves

Chemical Characteristics of Irrigated Ultisol with Dairy Effluent Dilutions

The objective of this work was to analyze the changes in the chemical attributes of an Ultisol irrigated with different dairy effluent dilutions. The experiment was set up using a randomized block design with five dilutions of dairy effluent (DE) in public water supply (PWS) (T1 only PWS, T2 10% of DE plus PWS, T3 20% of DE plus PWS, T4 30% of DE plus PWS, and T5 40% of DE plus PWS). Soil samples were collected at five depths to quantify the attributes of pH, organic matter (OM), potassium (K), phosphorus (P) and electrical conductivity of the soil saturation extract (ECss). No significant effects of dairy effluent dilutions were found in altering the pH, OM and K+ values of the Ultisol after 240 days of application. However, there was a significant increase of P in T4, and of ECss mainly in the 0.10 to 0.20 m layer of T5.

Productive and morphogenetic characteristics of sunflower irrigated with domestic treated wastewater on northeast semiarid area.

The present study aimed to evaluate the agronomic performance of the sunflower crop irrigated with treated domestic wastewater and normal water (well-water) in a inceptisol of Apodi, State of Rio Grande do Norte, Brazil. The experiment was conducted in a randomized block experimental design, consisting of five treatments and five replications, using the H-251 sunflower cultivar from Embrapa. The treatments consisted of the application of five proportions of wastewater/well-water (T1 - 100% wastewater; T2 - 75% wastewater and 25% well water, T3 - 50% wastewater and 50% well-water, T4 - 25% wastewater and 75% well-water and T5 - 100% well-water plus chemical fertilizer, control). The variables such as plant height, leaf number, diameter of stem and the head, yield, oil production, thousand-grain weight and head weight were evaluated. The combined use of wastewater and well-water is an alternative for the substitution of mineral fertilization with minimal damage to the productive potential and development of the sunflower crop. In general, the T4 treatment was the most adequate to improve agronomic performance of the sunflower.

AVALIAÇÃO DE SISTEMA DE TRATAMENTO DE LATICÍNIO E O EFEITO DO EFLUENTE GERADO NOS ATIBUTOS FISICO-QUÍMICO DE UM ARGISSOLO VERMELHO - DOI: 10.13083/1414-3984.v22n01a07

The effluents generated in dairy industries have high levels of organic matter, fats, nutrients and suspended solids, having to be treated properly. The improper disposal of these waters causes damage to the soil and salinity, sodicity, change in pH, among others. The milk was subjected to a tributary / secondary preliminary treatment consists of railing and grease trap followed by mixing aerated pond, and the effluent generated after treatment applied to the soil furrow irrigation This study aimed to evaluate the efficiency of dairy effluent treatment and reuse its effect in the physical-chemical properties of an argisoil red furrow irrigated. Analyzed for physico-chemical, determining TS, SD,SS, pH, Na+, K+, Cl-, CE, hardness, Ca+2, Mg+2, nitriti, nitrate, COD and BOD for the samples of effluent. Was evaluated the characteristics of N, P, K, Ca+2, Mg+2,Na+, E Cand pH from five depths of. It found removal efficiency of 72.14% for BOD and 56.52% for COD. There was an increase in the concentration of Na+, P, Cl- in the treated effluent, this fact possibly caused due to accumulation of logo in aerated lagoon. The highest concentration of (Na+) in the soil occurred at the 0-10 cm depth, with a value of 1373.6 cmolcdm-3, decreasing sequentially in the following layers. The higher concentration of magnesium (Mg+2) was 4.00 cmolcdm-3 in the layer of 40-50 cm depth, this occurred because of their high mobility in soil.