Encontrados 4 documentos, a visualizar página 1 de 1
Práticas alternativas de correcção da clorose férrica em citrinos
Varennes, Amarilis de; Pestana, M.; Correia, P.J.; Faria, E.A.The correction of iron chlorosis in trees grown on calcareous soils is normally achieved by the application of Fe (III)chelates such as iron ethylenediaminedi-ohydroxyphenylacetate (Fe-EDDHA) to the soil. This practice is very expensive and has to be repeated every year because iron is rapidly immobilized in the soil or leached out of the root zone. The responses of orange trees (Citrus sinensis (L.) Osb. cv. ‘...
Relationships between nutrient composition of flowers and fruit quality in oran...
Pestana, M.; Beja, P.; Correia, P. J.; Varennes, Amarilis de; Faria, E. A.A field experiment was conducted in a commercial orange orchard (Citrus sinensis (L.) Osb. cv. ‘Valencia late’ grafted on Citrange Troyer) established on a calcareous soil in the south of Portugal, to investigate if flower analysis could be used to predict fruit quality. In April 1996, during full bloom, flowers were collected from 20 trees. In March 1997 the fruits were harvested and their quality evaluate...
Neural network models in greenhouse air temperature prediction
Ferreira, P. M.; Faria, E. A.; Ruano, A. E.The adequacy of radial basis function neural networks to model the inside air temperature of a hydroponic greenhouse as a function of the outside air temperature and solar radiation, and the inside relative humidity, is addressed. As the model is intended to be incorporated in an environmental control strategy both off-line and on-line methods could be of use to accomplish this task. In this paper known hybrid ...
Responses of “Newhall" orange trees to iron deficiency in hydroponics: effects ...
Pestana, M.; David, Maria Manuela; De Varennes, Amarilis; Abadía, Javier; Faria, E. A.Orange (Citrus sinensis L. Osb. cv. ‘Newhall’) plants grafted on Citrange troyer rootstock were grown in nutrient solution with 0, 5, 10 or 20 M Fe, with and without calcium carbonate. Calcium carbonate was added in order to mimic the natural conditions in calcareous soils. Leaf chlorophyll concentration was estimated every 3–4 days using the portable instrument SPAD-502 meter. Chlorophyll fluorescence paramet...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||