Modelling impact of climate variability on rainfed groundnut

Gadgil, S. and Rao, P.R.S. and Sridhara, S. (1999) Modelling impact of climate variability on rainfed groundnut. Current Science , 76 (4). pp. 557-569.

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We present here a heuristic model for the indirect impact of climate variability via the triggering of pests/diseases/weeds for rainfed groundnut over the Anantapur region. A simple hydrological model is used to determine the soil moisture for the rainfall pattern, in any given year. The criteria for determining when specific farming operations, such as ploughing and sowing, are performed are defined in terms of the soil moisture, on the basis of the farming practices in the region. With the sowing date so determined, the dates of occurrence of the different life history stages are known for any specific year. The events that trigger the growth and incidence/infestation of the major pests/diseases, viz. wet/dry spells, are also defined in terms of the soil moisture and/or rainfall. The probabilities of the occurrence of the different pests/diseases incorporated in the model are then calculated by running the model for eighty years for which daily rainfall data at the Ananthapur observatory have been obtained from the India Meteorological Department. The model has been validated by comparison of the results with the observations of the incidence/infestation of specific pests/diseases at the Anantapur agricultural station of the Andhra Pradesh University.

Item Type: Article
Additional Information: Dr S N Nigam research collection - Box No:3
Uncontrolled Keywords: Rainfed groundnut, Climate variability, Modelling impact
Author Affiliation: Centre for Ecological Sciences, Indian Institute of Science, India
Subjects: Atmosperic Science > Climatology
Plant Production
Plant Protection
Crop Improvement
Divisions: Groundnut
Depositing User: Mr Arbind Seth
Date Deposited: 28 Mar 2013 13:55
Last Modified: 28 Mar 2013 13:56
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