Climatic fluctuations and homogenization of Northeast Brazil using precipitation data.

Before using the basic precipitation data in any agroclimatic study to assess the productivity it is important to check the data series for homogeneity. For this purpose data of 105 locations for the period 1912-1981 over northeast Brazil were used. The preliminary study indicate nonhomogeneity in the time series during 1940's at few locations. The amplitude of variation of time series when taken as 10-year moving average show quite different for different regions. It appears that this amplitude is related to time of onset of effective rains in some extent. There is also great diversity in the fluctuations. They present a great regional diversity. Some diversity. Some of the data in the low latitudes indicate presence of four cycles namely 52, 26, 13 & 6.5. years. The 52-year cycle is also evident in the case of onset of southwest Monsoon over a low latitude zone (Kerala Coast) in India. In the case of south Africa the prominent cycles are 60, 30, 15 & 10 similar situation appears to be present in the higher latitudes of northeast Brazil.

Climatic classification: the semi-arid tropics and its environment a review.

This paper analyses the advantages and limitations in using the Troll, Hargreaves and modified Thornthwaite approaches for the demarcation of the semi-arid tropics. Data from India, Africa, Brazil, Australia and Thailand, were used for the comparison of these three methods. The modified Thornthwaite approach provided the most relevant agriculturally oriented demarcation of the semi-arid tropics. This method in not only simple, tut uses input data that are avaliable for a global network of stations. Using this method the semi-arid tropics include major dryland or rainfed agricultural zones with annual rainfall varying from about 400 to 1,250 mm. Major dryland crops are pearl millet, sorghum, pigeonpea and groundnut. This paper also presents the brief description of climate, soils and farming systems of the semi-arid tropics.

The Araucaria dendrochronological network: growth patterns and climatic signals of paraná-pine on the Southern Brazilian plateau.

2016

Climatic zoning of the Ibero-American viticultural regions.

The Ibero-American Network of Viticulture, a component of the program of agricultural technology of the CYTED (Ibero-American Program of Science and Technology for Development), is developing the project ?Zoning Methodology and Application in Viticultural Regions of Ibero-America?. An objective of the project is the climatic characterization of this large viticultural region with the participation of ten countries: Argentine, Bolivia, Brazil, Chile, Cuba, Spain, Mexico, Peru, Portugal, and Uruguay.

Climatic zoning of viticultural production periods over the year in the tropical zone: application of the methodology of the géoviticulture MCC System.

2005

Appleclim project: innovative approaches to develop apple cultivars adapted to the Southern-Brazilian climatic conditions.

2011

Climatic potential for viticulture in Central Chile.

2012

Climatic groups in Ibero-America viticulture compared to worldwide wine producer regions.

The wine production is an important activity in many Ibero-American countries. The wine producer regions of these countries configure a large use of different climate types and viticultural climates. In a vitivinicultural zoning project of CYTED (Ibero-American Program for Science, Technology and Development), a viticultural climatic characterization was done in this macro viticultural region. The project have assembled a climatic database that characterizes the viticultural regions, including relevant variables for viticulture: air temperature (mean, maximum, and minimum), precipitation, relative humidity, solar radiation, number of sunshine hours, wind speed, and evapotranspiration. Using indices of the Geoviticulture MCC System (HI, CI and DI), more than 70 viticultural regions in different countries (Argentina, Bolivia, Brazil, Chile, Cuba, Spain, Mexico, Peru, Portugal and Uruguay) were characterized according to its viticultural climatic. The results, which will be integrated to the worldwide database of the MCC System, showed that the Ibero-American viticulture is placed in a wide range of climatic groups of the wine producing regions around the world. This article presents the climatic groups found in Ibero-America, identifying also some new climatic groups not yet found in other regions of the world. This work also identifies some climatic groups not found in Ibero-America viticulture. The research has also highlighted viticultural areas characterized by climates with ?intra-annual climatic variability?, with the potential to produce more than one growing cycle per year. The results allow to conclude that the wide variability and climatic diversity present in Ibero-America may be one of the reasons to explain the diversity in terms of wine types, sensorial characteristics, typicity and uniqueness of wines produced on this macro-region.

The influence of climatic conditions on the phenolic composition of tropical Brazilian wines.

2012

Reação de genótipos de girassol à podridão branca (sclerotinia sclerotiorum) em condições de campo, na safrinha 2014.

RESUMO: O objetivo do presente trabalho foi avaliar a reação de genótipos de girassol à podridão branca, causada por Sclerotinia sclerotiorum, no colo e no capítulo, em condições de campo. Dezoito cultivares de girassol foram avaliadas, em experimento implantado em maio de 2014, em Mauá da Serra, PR, em condições de infecção natural do fungo. A avaliação das plantas indicou que a doença foi favorecida pelas condições climáticas de baixa temperatura e alta umidade, ocorrida na região na época de condução do experimento. Todos os genótipos de girassol avaliados foram suscetíveis a S. sclerotiorum. ABSTRACT: The objective of the present work was to evaluate the reaction of sunflower genotypes to Sclerotinia stalk and head rot, caused by Sclerotinia esclerotiorum. Eighteen cultivars were evaluated in a field experiments sowed in May 2014, in Maua da Serra, PR, Brazil, under natural infection in the field. The evaluation of the plants indicated that the disease was favored by the climatic conditions of low temperature and high humidity, which occurred in the region during the time of conducting the experiment. All sunflower genotypes tested are susceptible to Sclerotinia stalk and/or head rot.