Using geostatistical analysis to evaluate the presence of Rotylenchulus reniformis in cotton crops in Brazil: Economic implications

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Data

2002-09-01

Autores

Farias, PRS
Sanchez-Vila, X
Barbosa, J. C.
Vieira, SR
Ferraz, LCCB
Soliz-Delfin, J.

Título da Revista

ISSN da Revista

Título de Volume

Editor

Soc Nematologists

Resumo

In recent years, the productivity of cotton in Brazil has been progressively decreasing, often the result of the reniform nematode Rotylenchulus reniformis. This species call reduce crop productivity by up to 40%. Nematodes can be controlled by nematicides but, because of expense and toxicity, application of nematicides to large crop areas may be undesirable. In this Work. a methodology using geostatistics for quantifying the risk of nematicide application to small crop areas is proposed. This risk, in economic terms, can be compared to nematicide cost to develop an optimal strategy for Precision Farming, Soil (300 cm(3)) was sampled in a regular network from a R. reniformis-infested area that was a cotton monoculture for 20 years. The number of nematodes in each sample was counted. The nematode number per volume of soil was characterized using geostatistics, and 100 conditional simulations were conducted. Based on the simulations, risk maps were plotted showing the areas where nematicide should be applied in a Precision Farming context. The methodology developed can be applied to farming in countries that ale highly dependent on agriculture, with useful economic implications.

Descrição

Palavras-chave

conditional simulations, cotton, Geostatistics, Kriging, Precision farming, Rotylenchulus reniformis, semivariogram

Como citar

Journal of Nematology. Marceline: Soc Nematologists, v. 34, n. 3, p. 232-238, 2002.