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Simulation Models for Studying Limiting Factors in Potato Production
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GIS-linked simulation models can be used to study the effect of yield limiting factors on potato production. Both differences between areas and between cultivars can be assessed. With a crop growth model, standard varieties can be compared with either ideo-typed or existing improved varieties. By linking a model to a GIS, the potential benefit of cultures replacement can be studied over large regions.

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The simulation models are driven by weather data interpolated on a grid. Monthly values of minimum and maximum temperature are used to determine potential growing seasons for each grid cell, precipitation and potential evapotranspiration data are used to determine growing seasons for rain fed cropping.

Potential potato production zones in the Andean countries
In addition, monthly radiation data are used to calculate yields. The monthly values are supplied as inputs to a weather generator which produces years with different daily weather used by the potato growth simulation model. The work is carried out on a PC using IDRISI software. result.jpg 1.67 K
The GIS-linked simulation models are useful tools for:
  • guiding crop improvement efforts,
  • studying the importance of yield limiting factors,
  • enabling a better estimation of the effect on yield of new varieties and their potential adoption.

Comparison of potential and rain fed potato yield in Ecuador

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Contact : Robert J. Hijmans, International Potato Center (CIP)
Apartado 1558, La Molina, Lima 12, Peru
Fax: +51.1.3495638
E-mail: r.hijmans@cgnet.com | http://www.cipotato.org/