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| Megda,Michele Xavier Vieira; Mariano,Eduardo; Leite,José Marcos; Megda,Marcio Mahmoud; Trivelin,Paulo Cesar Ocheuze. |
| Abstract: The objective of this work was to evaluate the effect of the application of ammonium chloride as a nitrogen source for sugarcane (Saccharum sp.) on the development of the crop’s shoot and roots during two consecutive cycles. The experiment was conducted on a Typic Hapludox in the first and second sugarcane ratoons. The treatments consisted of four N doses (50, 100, 150, and 200 kg ha-1) applied as ammonium chloride (NH4Cl), besides a control, without the application of N. The increase in the NH4Cl dose increased in up to three times soil electrical conductivity in the layer of 0.0-0.2 m, with a consequent increase in the concentration of chlorine in leaves. In the second cycle, the contents of chlorine increased in 1,900 mg kg-1 in the leaf with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Saccharum; Electrical conductivity; Nitrogen fertilization; Root system; Stalk productivity. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102100 |
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| Theago,Eduardo Quimello; Buzetti,Salatiér; Teixeira Filho,Marcelo Carvalho Minhoto; Andreotti,Marcelo; Megda,Marcio Mahmoud; Benett,Cleiton Gredson Sabin. |
| Para obter altas produtividades de trigo, são necessários o manejo correto da adubação nitrogenada e a utilização de cultivares de alto potencial produtivo. Sendo assim, objetivou-se avaliar doses e fontes de nitrogênio (N), aplicadas totalmente em semeadura ou em cobertura, na produção e nos seus componentes em dois cultivares de trigo irrigado, em sistema de plantio direto, cultivado numa região de cerrado de baixa altitude. O delineamento experimental foi em blocos ao acaso, em esquema fatorial 5 × 3 × 2 × 2, com três repetições, combinando cinco doses de N (0, 50, 100, 150 e 200 kg ha-1), três fontes de N (Entec®, sulfato de amônio e ureia), duas épocas de aplicação de N (na semeadura, ao lado das linhas, ou em cobertura), e em dois cultivares de trigo... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Triticum aestivum L.; Adubação nitrogenada; Cerrado; Cereais de inverno; Plantio direto. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000600017 |
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| Megda,Marcio Mahmoud; Carvalho,Morel de Passos e; Vieira,Michele Xavier; Andreotti,Marcelo; Pereira,Elaine Cristina. |
| A porosidade do solo exerce grande influência sobre o crescimento e desenvolvimento vegetal, uma vez que o crescimento das raízes, tal como a produtividade das culturas, é limitado pela profundidade que atingem. Portanto, o objetivo deste trabalho foi estudar a variabilidade espacial e as correlações lineares entre a produtividade de feijão e a porosidade do solo. No ano de 2004/2005, no município de Selvíria, MS, foram analisadas a produtividade de grãos de feijão (PG), cultivar IAC Carioca, irrigado, a macroporosidade (MA), a microporosidade (MI) e a porosidade total (PT) do solo em quatro profundidades: 1 (0,0-0,10); 2(0,10-0,20); 3(0,20-0,30) e 4(0,30-0,40 m), num Latossolo Vermelho distroférrico. As amostras de solo e planta foram coletadas em uma... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Variabilidade espacial; Manejo do solo; Plantio direto; Phaseolus vulgaris L. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000200032 |
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| Megda,Marcio Mahmoud; Monteiro,Francisco Antonio. |
| The objective of this work was to study morphogenic characteristics, and dry matter production of roots and shoots of marandu palisadegrass (Brachiaria brizantha cv. Marandu) submitted to combinations of nitrogen and potassium, in a nutritive solution, employing silica as substrate. The experiment was carried out in a greenhouse during the summer. It was used a 5² fractionated factorial scheme with 13 combinations of nitrogen and potassium, which were distributed in a randomized block design, with four replications. The nitrogen × potassium interaction was significant for the number of tillers and leaves, for leaf area, for shoots and root section dry mass, for total length and surface and specific length and surface in the roots. Production of aerial part... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachiaria brizantha; Leaf; Nutrient solution; Root; Shoot; Tiller. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000800007 |
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| Garcez,Tiago Barreto; Megda,Marcio Mahmoud; Artur,Adriana Guirado; Monteiro,Francisco Antonio. |
| The development of root system of forage grasses is influenced by the supply of mineral nutrients. The experiment was carried out in a greenhouse in Piracicaba, São Paulo State, with the objective of evaluating the effect of nitrogen and magnesium rates on dry mass yield, total length and surface, specific length and surface, and concentrations of nitrogen, magnesium, calcium and potassium in the root system of Brachiaria brizantha Stapf. cv. Marandu. It was studied five rates of nitrogen (2, 9, 16, 23 and 30 mmol L-1) and five rates of magnesium (0.05, 0.70, 1.35, 2.00 and 2.65 mmol L-1) in nutrient solutions in an incomplete 5² factorial arrangement, which resulted in the following combinations: 2/0.05; 2/1.35; 2/2.65; 9/0.70; 9/2.00; 16/0.05; 16/1.35;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brachiaria brizantha; Nutrient; Nutrient solution; Root; Root length; Root surface. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000700005 |
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| Pereira,David Gabriel Campos; Santana,Isadora Alves; Megda,Marcio Mahmoud; Megda,Michele Xavier Vieira. |
| ABSTRACT: Potassium chloride is the most widely used potassium source worldwide, and due to its continuous use, the accumulation of its salts in the soil and in plants is becoming more common. Excess available ions can cause a series of physiological disturbances in organisms and can become a biocide in the soil. The objective of this study was to evaluate the effects of the application of KCl and banana crop residues on soil chloride content, microbial activity, and soil ammonification. The experiment utilized a completely randomized 2 × 4 factorial design with four replicates. Treatments were as follows: two doses of vegetal residue (200 and 400 mg dm-3) × four doses of KCl (0, 167, 334, and 668 mg dm-3 of KCl) and a control (untreated soil). The CO2... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Respirometry; Salinity; Bananeira residues; Ammonification.. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000500250 |
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