Soil Factors, Farmer's Practices and Chestnut Ink Disease: Some Interactions

Portela, E.; Aranha, J.; Martins, A.; Pires, A. L.

doi:10.17660/actahortic.1999.494.65

Cited by 24 publications

(31 citation statements)

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“…In general, it is assumed that the trend in the chestnut productivity time series can be due to factors that do not remain constant during the study period such as the introduction of new agriculture techniques, pesticides, laws and government policies, crop diseases and plagues (Portela et al, 1999;Gentile et al, 2009;Ghezi et al, 2010). In fact, chestnut diseases, such as ink and cancer, which reached Portugal in the 19th century and ended in the 20th century, respectively, could be among the possible reasons for the long-term linear decreasing tendency (Kiple and Ornelas, 2000).…”

Section: Resultsmentioning

confidence: 99%

Assessment of weather-related risk on chestnut productivity

Pereira

Caramelo

Gouveia

et al. 2011

Nat. Hazards Earth Syst. Sci.

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Abstract. Due to its economic and nutritional value, the world production of chestnuts is increasing as new stands are being planted in various regions of the world. This work focuses on the relation between weather and annual chestnut production to model the role of weather, to assess the impacts of climate change and to identify appropriate locations for new groves. The exploratory analysis of chestnut production time series and the striking increase of production area have motivated the use for chestnut productivity. A large set of meteorological variables and remote sensing indices were computed and their role on chestnut productivity evaluated with composite and correlation analyses. These results allow for the identification of the variables cluster with a high correlation and impact on chestnut production. Then, different selection methods were used to develop multiple regression models able to explain a considerable fraction of productivity variance: (i) a simulation model (R 2 -value = 87 %) based on the winter and summer temperature and on spring and summer precipitation variables; and, (ii) a model to predict yearly chestnut productivity (R 2 -value of 63 %) with five months in advance, combining meteorological variables and NDVI. Goodness of fit statistic, cross validation and residual analysis demonstrate the model's quality, usefulness and consistency of obtained results.

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Section: Resultsmentioning

confidence: 99%

Assessment of weather-related risk on chestnut productivity

Pereira

Caramelo

Gouveia

et al. 2011

Nat. Hazards Earth Syst. Sci.

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“…Tillage operations are used to incorporate leaves and burs into the soil * Corresponding author: fraimund@utad.pt and to control weeds, with the objective of reducing competition for water and nutrients. However, this system has been reported as the most important factor for physical, chemical and biological soil degradation (Portela et al, 1999;Raimundo et al, 2001) in the abovementioned chestnut stands. Therefore, it is necessary to establish management systems in chestnut stands to improve their productivity and sustainability, and to ameliorate soil quality.…”

Section: Introductionmentioning

confidence: 98%

Decomposition of chestnut litterfall and eight-year soil chemical changes under a no-tillage management system in Northern Portugal

Raimundo

Martins

Madeira³

2008

Ann. For. Sci.

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-• Chestnut stands (Castanea sativa Mill.) for fruit production, in Northern Portugal, are subjected to frequent soil tillage operations, which is considered a threat for the system sustainability.• The effects of replacement of conventional tillage by the no-tillage system in chestnut stands on decomposition and nutrient dynamics of leaf litter and burs were evaluated, using the litterbag methodology. Amounts of mass and nutrients in the organic layers, and chemical characteristics of the 0-20 cm top soil layer were assessed after eight years.• The mass loss and release of N, P, Ca and Mg from both leaves and burs buried in the soil were faster than from those placed on the soil surface. Burs decomposed and released nutrients more slowly than leaf litter. The no-tillage system led to the formation of organic layers, which retained great amounts of N (249.2 kg ha −1 ) and Ca (215.5 kg ha −1 ). Such a management system increased the concentration of organic C and nutrients in the 0-5 cm top soil layer, but significant differences were only observed for exchangeable Ca.• The no-tillage system may enhance organic C accumulation regarding the conventional system, due to the increment in both organic and mineral soil layers.litterfall decomposition / litterbag / nutrient dynamics / chestnut stand / soil management / decomposition models / no-tillage / conventional tillage Résumé -Décomposition des chutes de litière de châtaignier et huit années de changements chimiques du sol sous un système de gestion sans labour dans le Nord du Portugal.• Les peuplements de châtaignier (Castanea sativa Mill.) pour la production de fruits dans le Nord du Portugal font l'objet de fréquentes opérations de labour, qui sont considérées comme une menace pour un système de gestion durable.• Les effets de remplacement du labour traditionnel par un système sans labour dans les peuplements de châtaignier sur la décomposition et la dynamique des nutriments des feuilles de la litière et des bogues, ont été évalués en utilisant la technique des sacs à litière. La masse totale des nutriments dans les strates organiques et les caractéristiques chimiques de la partie supérieure (0-20 cm) du sol ont été estimées au bout de huit ans.• La perte de masse et la libération de N, P, Ca et Mg provenant des feuilles et des bogues enfouies dans le sol ont été plus rapides que dans le cas de feuilles et bogues placées à la surface du sol. Les bogues se décomposent et libèrent des nutriments plus lentement que les feuilles de la litière. Le système d'absence de labour a conduit à la formation de strates organiques, qui retiennent une grande quantité de N (249,2Kg ha −1 ) et de Ca (215,5 kg ha −1 ). Un tel système de gestion a accru la concentration en C organique et en nutriments dans la strate de la partie supérieure du sol (0-5cm), mais des différences significatives ont été observées seulement pour le Ca échangeable.• Le système sans labour peut accroître l'accumulation de C organique par rapport au système traditionnel à cause de l'accroissement ...

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“…In northern Portugal, chestnut trees are grown in mountain areas from 600 to 1000 m a.s.l., with rye and potatoes as understorey crops. Soils are usually shallow with high acidity and low organic matter content, as well as low extractable phosphorus and exchangeable bases (Portela et al, 2003(Portela et al, , 1999. Soil compaction and root damage from wheel traffic and equipment associated with tillage are common (Fonseca et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Temporal Analysis of Sweet Chestnut Decline in Northeastern Portugal Using Geostatistical Tools

Castro¹,

Azevedo²,

Martins³

2010

Acta Hortic.

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The rising demand for sweet chestnut (Castanea sativa) in Portugal and elsewhere in Europe has led to more intensive management practices to increase nut production. This intensification has potentially increased the widespread of ink and chestnut blight diseases, causing decline in sweet chestnut orchards health and production and limiting the establishment of new planted areas. In this study we estimated chestnut decline along the last twenty years (1986 to 2006) in the northern part of Portugal using 1986, 1995 and 2006 aerial photography to quantify the damage at the tree level within fixed sample plots according to a categorical scale. Mean damage and damage variance in each date, however, were not significantly different. Geostatistical analyses indicated, however, changes in the spatial distribution of damaged and undamaged areas over time. The spread of decline in the region of study was estimated using Kriging based on the spherical model. During the examined period we observed spread of chestnut decline and increasing damage levels in regions where damage is systematically high. The chestnut productive surface in the region has increased in the last twenty years because new plantations exceeded mortality areas. The spatial analyses applied here have made clearer the relations between the spread of chestnut decline and geographical variables.

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Soil Factors, Farmer's Practices and Chestnut Ink Disease: Some Interactions

Cited by 24 publications

References 0 publications

Assessment of weather-related risk on chestnut productivity

Assessment of weather-related risk on chestnut productivity

Decomposition of chestnut litterfall and eight-year soil chemical changes under a no-tillage management system in Northern Portugal

Temporal Analysis of Sweet Chestnut Decline in Northeastern Portugal Using Geostatistical Tools

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