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| Maia,Suelen Cristina Mendonça; Soratto,Rogério Peres; Liebe,Suzane Maria; Almeida,Adriana Queiroz de. |
| Abstract: The objective of this work was to establish the diagnostic leaf and the nitrogen sufficiency index (NSI) values most appropriate to estimate N requirement by the 'Pérola' common bean (Phaseolus vulgaris), based on chlorophyll meter monitoring. The diagnostic leaf was defined in an experiment with five N rates, and up to four sampling dates of the diagnostic leaves were evaluated (first, second, and third completely expanded leaves from the apex). The NSI was established in two crop seasons, under six N managements: M1, 40 kg ha-1 N at sowing + 80 kg ha-1 10 days after emergence (DAE) + 80 kg ha-1 20 DAE (reference rate); M2, 20 kg ha-1 at sowing + 40 kg ha-1 10 DAE + 40 kg ha-1 20 DAE (recommended rate); M3, 20 kg ha-1 at sowing + 30 kg ha-1 when... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris; Diagnostic leaf; Nitrogen fertilization; Nitrogen sufficiency index; Nitrogen use efficiency; Relative chlorophyll index. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000700512 |
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| Pivetta,Laércio Augusto; Castoldi,Gustavo; Pivetta,Laerte Gustavo; Maia,Suelen Cristina Mendonça; Rosolem,Ciro Antonio. |
| ABSTRACT Since there is no consensus on phosphogypsum (PG) rates to be used in agriculture, a better understanding of its effects on the soil solution is needed. Cotton root growth was evaluated as related to Al and Ca activity in soil solution affected by PG. The experiment was carried out in rhizotrons filled with30∙dm–3 of soil. PG rates were estimated by multiplying the soil clay content by 0.0, 1.5, 3.0, 6.0 and 12.0, and it was mixed to the sub-soil.In the upper soil layer, limestone was applied. After 90 days, samples were taken for analysis, and cotton was planted. After27 days, plants were harvested. PG increased soil pH and decreased Al content and activity. Without PG, dissolved organic carbon concentration was high in the soil solution, which... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aluminum; Dissolved organic carbon; Soil chemistry. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000200264 |
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| Freitas,Lucas Barbosa de; Fernandes,Dirceu Maximino; Maia,Suelen Cristina Mendonça. |
| Solos com altos teores de Al tóxico podem causar diversos danos às plantas e, como consequência, diminuir sua produtividade; assim, seu manejo torna-se imprescindível para obter maiores produtividades, e o Si pode ser alternativa para diminuir a toxidez por Al em plantas. O objetivo deste trabalho foi avaliar a interação entre Si e Al em plantas de arroz de terras altas cultivadas em solo naturalmente alumínico de textura média arenosa. O delineamento experimental utilizado foi o de blocos inteiramente casualizados, dispostos em esquema fatorial 2 x 5 com quatro repetições. Os tratamentos empregados foram dois cultivares de arroz de terras altas: BRS Talento (não tolerante ao Al, moderno) e Guarani (tolerante ao Al3+, tradicional), além de cinco doses de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oriza sativa L; Toxidez ao alumínio; Silicato. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000200020 |
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