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| Hernández,LF. |
| The relationships between (1) leaf biomass and morphology (lamina area and petiole and lamina inclination), (2) petiole's mechanical and structural properties, and (3) the vertical light gradient inside the crop's canopy were studied in field grown sunflower (Helianthus annuus L.) plants, maintained at optimum soil water and mineral levels. At flowering, incident photosynthetic active radiation (PAR) was measured at the top of the canopy and on individual leaves using a quantum sensor. The fraction of direct incident radiation which passed through the canopy reaching each individual leaf was then calculated. Individual petiole and lamina inclination angles (iaPetiole and iaLamina, respectively) were measured from sequential digital images. These were taken... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomechanics; Helianthus; Leaf angle; Light interception; Sunflower. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000200001 |
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| CIESLIK,L.F.; VIDAL,R.A.; MACHADO,A.B.; TREZZI,M.M.. |
| ABSTRACT Grass weeds are common in summer crops and strongly decreases the grain yield of the common bean crop. The time of herbicide application influences the variability of environmental conditions and affects the product performance. The objectives of this work were to identify the time of fluazifop-p-butyl (fluazifop) application which gives best grass weed control in the common bean crop and to elucidate the environmental variables most important for the efficacy of this herbicide. Field experiments were conducted involving five application times (2 a.m., 6 a.m., 11 a.m., 4 p.m. and 9 p.m.) and five doses of fluazifop (80, 110, 140, 170 and 200 g ha-1), with additional no-herbicide control. At the time of the herbicide application it was determined... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chemical control; Environmental conditions; Leaf angle; Conceptual map. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100219 |
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