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Agroclimatic classification: numerical- taxonomic procedures - a review. Repositório Alice
REDDY, S. J..
The paper catalogues the procedures and steps involved in agroclimatic classification. These vary from conventional descriptive methods to modern computer-based numerical techniques. There are three mutually independent numerical classification techniques, namely Ordination, Cluster analysis, and Minimum spanning tree; and under each technique there are several forms of grouping techniques existing. The vhoice of numerical classification procedure differs with the type of data set. In the case of numerical continuous data sets with booth positive and negative values, the simple and least controversial procedures are unweighted pair group method (UPGMA) and weighted pair group method (WPGMA) under clustering techniques with similarity measure obtained...
Tipo: Artigo de periódico Palavras-chave: Classificacao; Agroclimatic; Climatic.; Clima; Agricultura; Climatologia.; Classification..
Ano: 1983 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/132990
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Agroclimatic classification of the semi-arid tropics. II. Identification of classification variables. Repositório Alice
REDDY, S. J..
Eight agroclimatic variables related to crop production potential in the semi-arid tropics of India are identified. These are used to assess dry-seeding feasibility, water-logging hazard, risk in agricultural production, cropping patterns and their spatial distribution, using data from 80 locations in India. Regression analysis has been used to identify differences between locations at different scales, i.e., local differences caused by orography, region differences associated with general circulation patterns. Using the data of 08 variables from 199 locations in India and two west African countries (Senegal and Upper Volta) three dissimilarity parameters were derived. The basic dissimilarity observed on a continental scale is that for the same amount of...
Tipo: Artigo de periódico Palavras-chave: Classificacao; Variacao; Tropico semi-arido; Agroclimatic; Production; Variation; Semi-arid tropic; Agricultura; Climatologia; Produção; Risco; Risk.
Ano: 1983 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/132991
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Agroclimatic classification of the semi-arid tropics. I. A method for the computation of classificatory variables. Repositório Alice
REDDY, S. J..
A simple method based on rainfall (R) and potential evapotranspiration (PE) for deriving variables to classify the semi-arid tropics into relevant agronomically homogeneous zones in suggested. A term 'available effective rainy period' is introduced for this purpose. The available effective rainy period is defined as the number of consecutive weeks in which the 14-week moving average of R/PE is >ou= 0.75, but for the initial week the value of R/PE is >ou= 0.50. The preceding week is taken to be the week of commencement of the sowing rains. The method permits estimation of weet and dry spells during the available effective rainy periodo and an estimate of the likely percentage of cropfailure years. These selected parameters allow a more relevant and...
Tipo: Artigo de periódico Palavras-chave: Classificacao; Tropico semi-arido; Agroclimatic; Methods; Semi-arid tropic; Agricultura; Climatologia; Evapotranspiração; Método; Classification; Evapotranspiration.
Ano: 1983 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/133001
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