Zobrazeno 1 - 10
of 50
pro vyhledávání: '"Douglas Ramos Guelfi Silva"'
Autor:
Giuliano Marchi, Josefino de Freitas Fialho, Thomaz Adolpho Rein, João de Deus Gomes dos Santos Junior, Eduardo Alano Vieira, José Carlos Sousa-Silva, Juaci Vitória Malaquias, Douglas Ramos Guelfi Silva
Publikováno v:
Pesquisa Agropecuária Tropical, Vol 50, p e66133 (2020)
Organic management farms in the Federal District, Brazil, usually present overlimed and overfertilized soils, with high content of organic matter and high pH. These conditions lead to a low availability of manganese to crops. Many sweet cassava (Mani
Externí odkaz:
https://doaj.org/article/16f5e20dea654df3b3802103e5832bd5
Autor:
Eduardo Lopes Cancellier, Douglas Ramos Guelfi Silva, Valdemar Faquin, Bruno de Almeida Gonçalves, Leandro Lopes Cancellier, Carlos Roberto Spehar
Publikováno v:
Ciência e Agrotecnologia, Vol 40, Iss 2, Pp 133-144 (2016)
ABSTRACT High nitrogen losses by ammonia volatilization are expected when urea is used as the source of N. The use of controlled-release urea and urease inhibitors are possible strategies to reduce such losses and increase nitrogen use efficiency. Th
Externí odkaz:
https://doaj.org/article/47372aaf471c4c379c51adb621c74577
Autor:
Vanessa Martins, Douglas Ramos Guelfi Silva, Giuliano Marchi, Maurício Cunha Almeida Leite, Éder de Souza Martins, Ana Stella Freire Gonçalves, Luiz Roberto Guimarães Guilherme
Publikováno v:
Revista Brasileira de Ciência do Solo, Vol 39, Iss 1, Pp 194-204 (2015)
The current high price of potassium chloride and the dependence of Brazil on imported materials to supply the domestic demand call for studies evaluating the efficiency of alternative sources of nutrients. The aim of this work was to evaluate the eff
Externí odkaz:
https://doaj.org/article/01e77fd825d849449eebac22761e6a7e
Autor:
Douglas Ramos Guelfi Silva, Kátia Aparecida de Pinho Costa, Valdemar Faquin, Itamar Pereira de Oliveira, Thiago Fernandes Bernardes
Publikováno v:
Revista Ciência Agronômica, Vol 44, Iss 1, Pp 184-191 (2013)
A reconstituição da fertilidade do solo é um dos caminhos para se recuperar a capacidade produtiva da pastagem em degradação. A adubação nitrogenada é fundamental para o aumento da produção de forragem, principalmente, quando se trata da re
Externí odkaz:
https://doaj.org/article/cd62867b59444dce9ac6ee787d8a1310
Autor:
Fabricio William Ávila, Valdemar Faquin, Douglas Ramos Guelfi Silva, Carla Elisa Alves Bastos, Nilma Portela Oliveira, Danilo Araújo Soares
Publikováno v:
Ciência e Agrotecnologia, Vol 36, Iss 6, Pp 639-648 (2012)
The effects of foliar and soil applied phosphite on grain yield in common bean (Phaseolus vulgaris L.) grown in a weathered soil under low and adequate phosphate availability were evaluated. In the first experiment, treatments were composed of a 2 x
Externí odkaz:
https://doaj.org/article/799eb6a360bb4abe82db9dc853bc614c
Autor:
Douglas Ramos Guelfi Silva, Giuliano Marchi, Carlos Roberto Spehar, Luiz Roberto Guimarães Guilherme, Thomaz Adolpho Rein, Danilo Araújo Soares, Fabrício William Ávila
Publikováno v:
Revista Brasileira de Ciência do Solo, Vol 36, Iss 3, Pp 951-962 (2012)
The expansion of Brazilian agriculture has led to a heavy dependence on imported fertilizers to ensure the supply of the growing food demand. This fact has contributed to a growing interest in alternative nutrient sources, such as ground silicate roc
Externí odkaz:
https://doaj.org/article/583c111ee75d4bd6a3f90138076c2717
Autor:
Marcos André Silva Souza, Douglas Ramos Guelfi Silva, Fabrício William Ávila, Valdemar Faquin, Geraldo César de Oliveira, Carla Elisa Alves Bastos
Publikováno v:
Ciência e Agrotecnologia, Vol 35, Iss 6, Pp 1132-1140 (2011)
Soil compaction directly interferes on crop yield. The objectives of this work were to evaluate the effect of previous cultivation with palisade grass [Urochloa brizantha (C. Hochstetter ex A. Rich.) R. Webster cv. Marandu] and the use of soil correc
Externí odkaz:
https://doaj.org/article/563afa23c3784208b20dd808e9723794
Autor:
Douglas Ramos Guelfi Silva, André Ferreira Pereira, Ronaldo Liberato Dourado, Frederico Pinto da Silva, Fabrício William Ávila, Valdemar Faquin
Publikováno v:
Ciência e Agrotecnologia, Vol 35, Iss 3, Pp 516-523 (2011)
The management of nitrogen fertilization is complex due to the various transformations of the nitrogen that occur in the soil-plant-atmosphere system, reducing the efficiency of the fertilization, productivity and the profit margin of the maize produ
Externí odkaz:
https://doaj.org/article/8af8a6d8a5134c8ea14a8e0faa14844a
Autor:
Douglas Ramos Guelfi Silva, Kátia Aparecida de Pinho Costa, Valdemar Faquin, Itamar Pereira de Oliveira, Milena Rízzia Ferreira de Souza, Marcos André Silva Souza
Publikováno v:
Ciência e Agrotecnologia, Vol 35, Iss 2, Pp 242-249 (2011)
O presente estudo foi desenvolvido sob condições de campo, visando avaliar a eficiência no uso e no aproveitamento do nitrogênio pelo capim-marandu por meio de diversos índices. O experimento foi conduzido na Fazenda Modelo da Universidade Estad
Externí odkaz:
https://doaj.org/article/672c790f7ada4b4d91a6ee4c78aa8253
Autor:
Eduardo Bucsan Emrich, Rovilson José de Souza, Antonio Anicete de Lima, Felipe Campos Figueiredo, Douglas Ramos Guelfi Silva
Publikováno v:
Ciência e Agrotecnologia, Vol 35, Iss 1, Pp 56-61 (2011)
Conduziu-se este trabalho, com o objetivo de avaliar o efeito da aplicação, via foliar, de diferentes doses de silicato de potássio, sob os teores de clorofila a, b e total em folhas de tomateiro cultivados em dois substratos e a influência desse
Externí odkaz:
https://doaj.org/article/84ee5fd47df24bcca2eb2d004bfb4dff