Weed vegetation of sugarcane cropping systems of northern argentina data mining methods for assessing the environmental and management effects on species composition

Weed composition may vary because of natural environment, management practices, and their interactions. In this study we presented a systematic approach for analyzing the relative importance of environmental and management factors on weed composition of the most conspicuous species in sugarcane. A d...

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Detalles Bibliográficos
Autor principal: Ferraro, Diego Omar
Otros Autores: Ghersa, Claudio Marco, Rivero, Darío Ernesto
Formato: Artículo
Lenguaje:Inglés
Materias:
CLASSIFICATION AND REGRESSION TREES
STATISTICS
SUGARCANE
WEED COMPOSITION
ABUNDANCE
CLUSTER ANALYSIS
CROPPING PRACTICE
DATA MINING
ENVIRONMENTAL FACTOR
GRASS
INTEGRATED APPROACH
INTEGRATED PEST MANAGEMENT
MANAGEMENT PRACTICE
RAINFALL
SOIL FERTILITY
SOIL TYPE
SUGAR CANE
WEED CONTROL
ARGENTINA
CYNODON [ANGIOSPERM]
CYNODON DACTYLON
CYPERUS ROTUNDUS
ROTTBOELLIA
ROTTBOELLIA COCHINCHINENSIS
SORGHUM HALEPENSE
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2012Ferraro2.pdf
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Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
Descripción
Sumario:Weed composition may vary because of natural environment, management practices, and their interactions. In this study we presented a systematic approach for analyzing the relative importance of environmental and management factors on weed composition of the most conspicuous species in sugarcane. A data-mining approach represented by k-means cluster and classification and regression trees [CART] were used for analyzing the 11 most frequent weeds recorded in sugarcane cropping systems of northern Argentina. Data of weed abundance and explanatory factors contained records from 1976 sugarcane fields over 2 consecutive years. The k-means method selected five different weed clusters. One cluster contained 44 percent of the data and exhibited the lowest overall weed abundance. The other four clusters were dominated by three perennial species, bermudagrass, johnsongrass, and purple nutsedge, and the annual itchgrass. The CART model was able to explain 44 percent of the sugarcane's weed composition variability. Four of the five clusters were represented in the terminal nodes of the final CART model. Sugarcane burning before harvesting was the first factor selected in the CART, and all nodes resulting from this split were characterized by low abundance of weeds. Regarding the predictive power of the variables, rainfall and the genotype identity were the most important predictors. These results have management implications as they indicate that the genotype identity would be a more important factor than crop age when designing sugarcane weed management. Moreover, the abiotic control of cropweed interaction would be more related to rainfall than the environmental heterogeneity related to soil type, for example soil fertility. Although all these exploratory patterns resulting from the CART data-mining procedure should be refined, it became clear that this information may be used to develop an experimental framework to study the factors driving weed assembly. Nomenclature: Bermudagrass, Cynodon dactylon Pers. [CYNDA]; johnsongrass, Sorghum halepense [L.] Pers. [SORHA]; purple nutsedge, Cyperus rotundus L. [CYPRO]; itchgrass, Rottboellia exaltata [L.] L.f.[ROOEX].
ISSN:0043-1745

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