41 documents found, page 1 of 5
Ammonia volatilization and yield of corn fertilized with different nitrogen sou...
Santos,Wadson de Menezes; Alves,Bruno José Rodrigues; Urquiaga,Segundo; Pacheco,Edson Patto; Barros,Inácio de; Fernandes,Marcelo FerreiraAbstract: The objective of this work was to evaluate the effect of the use of different nitrogen fertilizers on N losses by NH3 volatilization and on the grain yield of a corn (Zea mays) crop grown in the semiarid region of the state of Sergipe, Brazil. Corn was managed under rainfed conditions and conventional tillage. The fertilization treatments were: sulfur-coated urea (SU) and organo-mineral-coated urea (O...
Deposition and decomposition of litter in periods of grazing and rest of a trop...
Ramalho,Israel Oliveira; Rezende,Claudia de Paula; Pereira,José Marques; Macedo,Robert de Oliveira; Santos,Camila Almeida dos; Monteiro,Rafael CassadorABSTRACT: The objectives of this study were to determine the rates of plant litter deposition and decomposition in Marandu pastures (Urochloa brizantha cv. Marandu) under a) three forms of nitrogen (N) supply, b) at different stages of rotational grazing and c) to compare the single-exponential decay constant (‘k’) derived from litterbags with values derived from estimates of deposited and existing litter (DEL ...
Natural abundance of 15N of N derived from the atmosphere by different strains ...
Araujo,Karla Emanuelle Campos; Torres Júnior,Carlos Vergara; Guimarães,Ana Paula; Silva,Mara Alexandre da; Alves,Bruno José Rodrigues; Urquiaga,SegundoABSTRACT: To quantify the BNF contribution to legumes using the 15N natural abundance technique, it is important to know the abundance of 15N of the plants grown entirely dependent on BNF (value ‘B’). The aim of the study was to determine the 15N natural abundance of N2 fixed by different Bradyrhizobium strains in symbiosis with one soybean cultivar. Treatments consisted of soybean plants cultivated with and wi...
Comparison of 15N isotope methods to determine the recovery efficiency of nitro...
Araújo,Ednaldo da Silva; Silva,Bárbara Fernanda da; Chieza,Emerson Dalla; Urquiaga,Segundo; Guerra,José Guilherme Marinho; Costa,Janaína RibeiroAbstract: The objective of this work was to compare three methods of 15N isotope application to the soil in order to determine the recovery efficiency of nitrogen derived from green manure by corn (Zea mays). The used experimental design was a randomized complete block with six replicates. The treatments consisted of three 15N isotope methods: indirect method I, isotope dilution with 15N-labelled synthetic fert...
Levels of Crotalaria juncea on growth, production, recovery and efficiency of t...
Diniz,Ellen R; Vargas,Thiago O; Pereira,Wander D; Santos,Ricardo HS; Urquiaga,Segundo; Modolo,Alcir JABSTRACT The recommendation for green manure (GM) in cropping systems still has little scientific support, with few studies addressing the effects of nutrient amounts from green manure on the growth and production of the crop. Our aim was to evaluate the effect of levels of Crotalaria juncea green manure on the growth, production, and efficiency of the use as well as the apparent recovery of N in broccoli crop....
Doses of Crotalaria juncea: Residual effect on zucchini and maize crop in seque...
Diniz,Ellen Rúbia; Vargas,Thiago de O; Guedes,Amanda F; Santos,Ricardo Henrique Silva; Urquiaga,Segundo; Modolo,Alcir JoséABSTRACT Amounts of N from green manures not absorbed in the first cycle can be absorbed by the subsequent crops. Therefore, it is important to quantify and monitor the residual effects of green manure to increase the agronomic benefits of its use in cropping systems. Our purpose was to study the residual effect of doses of the Crotalaria juncea green manure applied in broccoli crop in the zucchini-maize succes...
SPATIAL VARIABILITY AND VITALITY OF EPIGEOUS TERMITE MOUNDS IN PASTURES OF MATO...
Lima,Sandra Santana; Ceddia,Marcos Bacis; Zuchello,Fernando; Aquino,Adriana Maria de; Mercante,Fábio Martins; Alves,Bruno José RodriguesEpigeous termite mounds are frequently observed in pasture areas, but the processes regulating their population dynamics are poorly known. This study evaluated epigeous termite mounds in cultivated grasslands used as pastures, assessing their spatial distribution by means of geostatistics and evaluating their vitality. The study was conducted in the Cerrado biome in the municipality of Rio Brilhante, Mato Gross...
Bactérias promotoras de crescimento e adubação nitrogenada no crescimento inici...
Gírio,Lucas Augusto da Silva; Dias,Fábio Luis Ferreira; Reis,Veronica Massena; Urquiaga,Segundo; Schultz,Nivaldo; Bolonhezi,DenizartO objetivo deste trabalho foi avaliar os efeitos da inoculação de bactérias promotoras de crescimento sobre a formação de mudas pré-brotadas de cana-de-açúcar, oriundas de gemas individualizadas, e quantificar o crescimento inicial dessas mudas, em associação à aplicação de nitrogênio, em solo de baixa fertilidade. Foram conduzidos dois experimentos: um em casa de vegetação, com duração de 50 dias, e o outro, e...
Inoculation of sugarcane with diazotrophic bacteria
Schultz,Nivaldo; Silva,Jeferson Alves da; Sousa,Jailson Silva; Monteiro,Rafael Cassador; Oliveira,Renan Pedula; Chaves,Valfredo Almeida; Pereira,WillianThe sugarcane industry, a strategic crop in Brazil, requires technological improvements in production efficiency to increase the crop energy balance. Among the various currently studied alternatives, inoculation with diazotrophic bacteria proved to be a technology with great potential. In this context, the efficiency of a mixture of bacterial inoculant was evaluated with regard to the agronomic performance and ...
Balanço energético da produção de grãos, carne e biocombustíveis em sistemas es...
Sá,Jerusa Maia e; Urquiaga,Segundo; Jantalia,Cláudia Pozzi; Soares,Luis Henrique de Barros; Alves,Bruno José Rodrigues; Boddey,Robert MichaelO objetivo deste trabalho foi avaliar a eficiência energética de sistemas especializados e mistos de produção de grãos e carne e o balanço energético na produção de bioenergia. Foram avaliados dados de 20 anos de cultivo com sistemas agrícolas especializados e mistos. Como sistemas agrícolas especializados, avaliaram-se: a pastagem de gramínea; a pastagem de gramínea consorciada com leguminosa; e a produção de ...