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218 results

Ecotoxicology of Pig Slaughterhouse Waste Using Lactuca sativa L., Raphanus sativus L., and Oryza sativa L.

Maiara Figueiredo Ramires ORCID logo , Eduardo Lorensi de Souza, Daniel Erison Fontanive, Renan Bianchetto, Ângelo Munaretto Krynski, Júlio Cesar Grasel Cezimbra, [...]

17/Jul/2019

ABSTRACT Pork is the most consumed animal protein around the world. The production levels are significant, which results in the generation of large amounts of slaughter waste. Such waste is often disposed of improperly in agricultural areas, causing environmental imbalance by the contamination of soil and water sources with metals and pathogenic organisms. This study evaluates the phytotoxic effects of pig slaughterhouse waste in natura and after stabilization processes on lettuce (Lactuca sativa Linnaeus, 1753), radish (Raphanus sativus Linnaeus, 1753), […]

Emissions of Nitrous Oxide and Methane in a Subtropical Ferralsol Subjected to Nitrogen Fertilization and Sheep Grazing in Integrated Crop-Livestock System

Jonatas Thiago Piva ORCID logo , Laércio Ricardo Sartor, Itacir Eloi Sandini, Anibal de Moraes, Jeferson Dieckow, Cimélio Bayer, [...]

14/Jun/2019

ABSTRACT Brazilian agriculture contributes significantly to nitrous oxide (N2O) and methane (CH4) emissions, so the understanding of such emissions at the field is crucial for mitigation strategies. This study quantified the impact of N application and sheep grazing on the N2O and CH4 emissions from a subtropical Ferralsol under an integrated crop-livestock (ICL) management system. In a long-term experiment in southern Brazil, gaseous fluxes were measured during a year-long cycle of ryegrass (Lolium multiflorum) plus oats (Avena sativa) winter pasture […]

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Ammonia Volatilization from Soil-Applied Organic Fertilizers

Adriano Alvim Rocha, Ednaldo da Silva Araújo ORCID logo , Silvio da Silva Santos, Jhonatan Marins Goulart, José Antonio Azevedo Espindola, José Guilherme Marinho Guerra, [...]

22/May/2019

ABSTRACT: A reliable quantification of nitrogen (N) losses by ammonia (NH3) volatilization can contribute to identifying optimized strategies of fertilizer management. The objective of this study was to quantify ammonia volatilization from several organic N sources incorporated into or applied onto the soil surface. Two cultivation areas, under snap bean and corn, were evaluated at Embrapa Agrobiology, Seropédica, Rio de Janeiro (RJ). Both experiments used a randomized complete block design in split-plots, with four replications. The main plots consisted of […]

Phosphate Sources and Filter Cake Amendment Affecting Sugarcane Yield and Soil Phosphorus Fractions

Amin Soltangheisi ORCID logo , Valdevan Rosendo dos Santos ORCID logo , Henrique Coutinho Junqueira Franco ORCID logo , Oriel Kolln ORCID logo , André Cesar Vitti ORCID logo , Carlos Tadeu dos Santos Dias ORCID logo , [...]

22/May/2019

ABSTRACT: The use of mineral phosphate fertilizers associated with organic residues can improve fertilizer use efficiency and consequently decrease their usage costs. Soil application of filter cake (FC) can provide nutrients and enhance physical quality. This study aimed to evaluate the effects of different phosphate fertilizers [rock phosphate (RP) and triple superphosphate (TSP)] applied at different rates (90 and 180 kg ha-1 P2O5) associated with filter cake (10 Mg ha-1 dry matter) on the soil phosphorus (P) fractions after two […]

Reference Values of Grain Nutrient Content and Removal for Corn

Aildson Pereira Duarte ORCID logo , Mônica Ferreira de Abreu, Eros Artur Bohac Francisco, Douglas de Castilho Gitti, Gabriel Barth, Claudinei Kappes

13/May/2019

ABSTRACT: Unchanged reference values of grain nutrient contents for corn have been used for over 20 years, despite yield increases, the development of new hybrids, and modifications to cropping systems, especially the establishment of in-season second crops and the wide adoption of no-tillage. This study measured macro- and micronutrient contents in corn grains from different regions, in the first (summer) and second (fall) crop, to update the reference values of estimated nutrient removal. A secondary objective was to determine whether […]

Nitrate Reductase Activity and Nitrogen and Biomass Accumulation in Sugarcane under Molybdenum and Nitrogen Fertilization

Renato Lemos dos Santos, Fernando José Freire, Emídio Cantídio Almeida de Oliveira, Maria Betânia Galvão dos Santos Freire ORCID logo , Jason Brossard West, José de Arruda Barbosa, [...]

13/May/2019

ABSTRACT Prior research on sugarcane showed increment of productivity following molybdenum (Mo) fertilization and some indication of the potential role either on nitrate reductase activity (NRA). However, this increment can depend on sugarcane variety and nitrogen (N) fertilization. This study aimed to evaluate the effect of Mo fertilization on Mo uptake, on NRA, nitrate (NO3–-N), and ammonium (NH4+-N) contents in leaves and roots of sugarcane, and the accumulation of N and biomass across two sugarcane varieties (RB 867515 and RB […]

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Decomposition and Nutrient Release of Cover Crops in Mango Cultivation in Brazilian Semi-Arid Region

Maria do Socorro Conceição de Freitas ORCID logo , Jacob Silva Souto, Mariana Gonçalves, Larissa Emanuelle da Silva Almeida, Alessandra Monteiro Salviano, Vanderlise Giongo

24/Apr/2019

ABSTRACT Knowledge of the decomposition dynamics of aboveground phytomass and its release of nutrients in mixtures of cover crops as well as the impact on the soil tillage system is fundamental for the sustainable management of agroecosystems. This work aimed to evaluate whether soil tillage and the choice of cover crops cultivated in the interrows can be technological strategies to increase dry biomass production, increase the capacity to add carbon, and improve macronutrient cycling in a mango ( Mangifera indica […]

Assessment of Trace Element Contents in Soils and Water from Cerrado Wetlands, Triângulo Mineiro Region

Bruno Teixeira Ribeiro ORCID logo , Diogo Costa Nascimento, Nilton Curi, Luiz Roberto Guimarães Guilherme, Enio Tarso de Souza Costa, Guilherme Lopes, [...]

24/Apr/2019

ABSTRACT In the Brazilian Cerrado biome, there are wetlands locally known as “Veredas”, which are swampy plains between hills and rivers. Since the 1970’s, the Cerrado biome has been gradually converted to livestock, crop, or forestry production. Until now, very few studies were conducted to evaluate the baseline contents of trace elements in Cerrado wetland soils. Due to their position in the landscape (bottom lands), the wetlands are potentially susceptible to contamination by runoff and/or leaching from surrounding areas at […]

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Optimal Simulation of the Land-Use Structure Based on the Local Ecological Environment: the Case of Huanghua City in Hebei Province, China

Ying Chen, Jianghui Cui, Ling He, Mingxin Men ORCID logo

10/Apr/2019

ABSTRACT The overuse of land has resulted in a sharp decline in ecological functions, affecting the environment as it relates to the existence and sustainable development of the whole biosphere. This work aims to evaluate the ecological and economic efficiencies of the land-use structure. A simulation model, CLUE-S (Conversion of Land-Use and its Effects at Small Region Extent), and an integrated model based on the MOP (Multi-Objective Program) and CLUE-S were applied to assess the suitability of unutilized lands in […]

Nitrous Oxide Emissions in No-Tillage Onion ( Allium cepa L.) Crops Are Increased by Oilseed Radish Cover Crop and Poultry Manure Application

Vilmar Müller Júnior ORCID logo , Leoncio de Paula Koucher, Monique Souza, Andria Paula Lima, Claudinei Kurtz, Rafael da Rosa Couto, [...]

10/Apr/2019

ABSTRATO O uso de plantas de cobertura e de esterco de galinha (PM) é uma alternativa para reduzir o uso de insumos sintéticos e pode contribuir para o ciclo de nutrientes em cebolas ( Allium cepa L.) cultivadas em sistema plantio direto. No entanto, esta prática de gestão pode contribuir para um aumento das emissões de N 2 O para a atmosfera. Os objetivos deste estudo foram avaliar o efeito imediato sobre as emissões de N 2 O da adição […]

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