|
|
|
|
|
| Souza,Leandro Vagno de; Miranda,Glauco Vieira; Galvão,João Carlos Cardoso; Eckert,Fernando Roberto; Mantovani,Éder Eduardo; Lima,Rodrigo Oliveira; Guimarães,Lauro José Moreira. |
| The objectives of this work were to study the genetic control of grain yield (GY) and nitrogen (N) use efficiency (NUE, grain yield/N applied) and its primary components, N uptake efficiency (NUpE, N uptake/N applied) and N utilization efficiency (NUtE, grain yield/N uptake), in maize grown in environments with high and low N availability. Experiments with 31 maize genotypes (28 hybrid crosses and three controls) were carried out in soils with high and low N rates, in the southeast of the state of Minas Gerais, Brazil. There was a reduction of 23.2% in average GY for maize grown in soil with low N, in comparison to that obtained with high N. There were 26.5, 199 and 400% increases in NUtE, NUpE, and NUE, respectively, for maize grown with low N. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Abiotic stress; Absorption efficiency; Combining ability; Commercial hybrids; Utilization efficiency. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008001100010 |
| |
|
|
| Costa,Sérgio Ely Valadão Gigante de Andrade; Souza,Edicarlos Damaceno de; Anghinoni,Ibanor; Flores,João Paulo Cassol; Cao,Eduardo Giacomelli; Holzschuh,Marquel Jonas. |
| Soil and fertilizer management during cultivation can affect crop productivity and profitability. Long-term experiments are therefore necessary to determine the dynamics of nutrient and root distribution as related to soil profile, as well as the effects on nutrient uptake and crop growth. An 18-year experiment was conducted at the Federal University of Rio Grande do Sul State (UFRGS), in Eldorado do Sul, Brazil, on Rhodic Paleudult soil. Black oat and vetch were planted in the winter and corn in the summer. The soil management methods were conventional, involving no-tillage and strip tillage techniques and broadcast, row-and strip-applied fertilizer placement (triple superphosphate). Available P (Mehlich-1) and root distribution were determined in soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil tillage; P fertilization; Utilization efficiency. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000500017 |
| |
|
|
| Martins,Priscila Oliveira; Crusciol,Carlos Alexandre Costa; Pilon,Cristiane. |
| Silicon is considered an important chemical element for rice, because it can improve tolerance to biotic and abiotic stress. However, in many situations no positive effect of silicon was observed, probably due to genetic factors. The objective of this research was to monitor Si uptake kinetics and identify responses of rice cultivars in terms of Si uptake capacity and use. The experiment was carried out in a greenhouse of the São Paulo State University (UNESP), Brazil. The experiment was arranged in a completely randomized, factorial design with three replications. that consisted of two rice cultivars and two Si levels. Kinetic parameters (Vmax, Km, and Cmin), root morphology variables, dry matter yield, Si accumulation and levels in shoots and roots,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa L.; Uptake efficiency; Utilization efficiency. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000100016 |
| |
|
|
|
