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Development and recovery of iron deficiency by iron resupply to roots or leaves...
Pestana, M.; Correia, P. J.; Saavedra, Teresa; Gama, Florinda; Abadía, Anunciación; Varennes, Amarilis deBare-root transplants of strawberry (Fragaria ananassa Duch. cv. ‘Selva’) were transferred to nutrient solutions with or without iron (Fe). After six weeks of growth, plants grown in solution lacking Fe were chlorotic and showed morphological changes in roots typical of Fe deficiency. Subsequently, four treatments were applied for nine days: plants grown in continued absence of Fe (Fe0); plants grown in continu...
The root ferric-chelate reductase of Ceratonia siliqua (L.) and Poncirus trifol...
Pestana, M.; Gama, Florinda; Saavedra, Teresa; Varennes, Amarilis de; Correia, P. J.Iron (Fe) deficiency is a common nutritional disorder in several crops grown in calcareous soils, but some species are well adapted to these conditions. A hydroponic experiment was conducted to compare the response of a calcicole species Ceratonia siliqua L. (carob) and of Poncirus trifoliata (L.) Raf., a citrus rootstock very sensitive to Fe deficiency. Rootstocks from both species were grown in nutrient solut...
A caracterização e correção da deficiência de ferro em plantas de morangueiro: ...
Pestana, Maribela; Gama, Florinda; Saavedra, Teresa; Pinto, João Castro; Abadia, Anunciación; Varennes, Amarilis de; Correia, Pedro JoséIron (Fe) is abundant in soils and although it is required in small amounts by plants the incidence of iron chlorosis (Fe deficiency) is very common in a number of crops and requires massive soil application of Fe-chelates to correct it. In this work, we present the most important results obtained in several experiments conducted with strawberry to study the physiological and biochemical response mechanisms to ...
Consequences of iron deficiency on fruit quality in citrus and stawberry
Pestana, M.; Varennes, Amarilis de; Miguel, Maria Graça; Correia, P. J.Proceedings of the International Conference “Environmentally friendly and safe technologies for quality of fruit and vegetables”, held in Universidade do Algarve, Faro, Portugal, on January 14-16, 2009. This Conference was a join activity with COST Action 924. ; Iron deficiency (iron chlorosis) is an important nutritional disorder in several plants, including fruit trees and strawberry. Iron chlorosis does not...
O uso da semente de tremoço como fertilizante azotado
Teixeira, Gonçalo; Katrochan, Kay; Varennes, Amarilis de; Martins, João Neves; Stuetzel, HartmutWe studied the use of lupine seeds as fertilizer to provide a slow release N source. The main objective was to compare different strategies to apply lupine seeds (Lupinus angustifolius L. cv. Azuro and cv. Boruta) as N-fertilizers for a white cabbage crop (Brassica oleracea capitata L. cv. Impuls). Since during the germination process the seedlings use storage carbohydrates as an energy source by respiration, t...
Improvement in soil and sorghum health following the application of polyacrylat...
Varennes, Amarilis de; Mourato, M.P.; Martins, L.L.; Cardoso, A.I.; Mota, A.M.; Pinto, A.P.; Gonçalves, M.L.; Guiwei, QuResearch Article ; Contamination of soils with cadmium (Cd) is a serious global issue due to its high mobility and toxicity. We investigated the application of insoluble polyacrylate polymers to improve soil and plant health. Sorghum was grown in a Cd-contaminated sandy soil. Polyacrylate polymers at 0.2% (w/w) were added to half of the soil. Control soil without plants was also included in the experiment. Gro...
Amendment of an acid mine soil with compost and polyacrylate polymers enhances ...
Varennes, Amarilis de; Queda, Cristina Cunha; Guiwei, QuMany soils derived from pyrite mines spoils are acidic, poor in organic matter and plant nutrients, contaminated with trace elements, and support only sparse vegetation. The establishment of a plant cover is essential to decrease erosion and the contamination of water bodies with acid drainage containing large concentrations of trace elements. We tested the application of compost and polyacrylate polymers to pr...
Polyacrylate polymers as immobilizing agents to aid phytostabilization of two m...
Varennes, Amarilis de; Queda, Cristina Cunha; Ramos, A.R.We evaluated the effect of polyacrylate polymers as immobilizing agents to aid phytostabilization of two mine soils. One soil had a very low pH (3.7) and a large Pb content, while the other was less acidic but had a greater content of Cu and Zn. Growth of perennial ryegrass (Lolium perenne L. cv. Victorian) was stimulated in polymer-amended soils. After ryegrass had been growing for 35 days, the amounts of wate...
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...
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