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University of Reading (1992)

A simulation study of sorghum and pearl millet forage crops in semi-arid Mexico

Gonzalez, Alma Delia Baez

Titre : A simulation study of sorghum and pearl millet forage crops in semi-arid Mexico

Auteur : Gonzalez, Alma Delia Baez

Université de soutenance : University of Reading

Grade :Doctor of Philosophy (Ph.D.) : 1992

Résumé
The sorghum and pearl millet forage crops were studied by the use of simulation models. The general objective was to test the possibility of including pearl millet as an alternative crop to grow under the same environment, soil type and management conditions as sorghum in semi-arid Mexico. The dynamic and deterministic models of sorghum (SorModel) and pearl millet (PmModel) were based on plant-soil water flow relationships. The plant submodel comprises the growth and development processes. It is mainly based on the Simple and Universal Crop growth Simulation Model (SUCROS). The soil water flow submodel considers four soil textures and comprises the infiltration, drainage and evapotranspiration processes. The simulated production of sorghum and pearl millet were compared with results of field experiments carried out in semi-arid Mexico. The models showed reasonable agreement with observed total dry matter production for both crops and it is suggested that the models can be used, within reasonable limits, to simulate the production of these crops in dryland agriculture. The models were applied to assess the feasibility of producing sorghum and pearl millet forage crops in different agroclimatic regions and to establish the response of both crops to initial soil moisture, seed rate and total water in such a way that management policies were generated. It is shown that pearl millet is an alternative crop in semi-arid Mexico for areas with 300 mm or more of precipitation and regardless of soil texture. A seed rate of 20 kg ha-1 is recommended. Furthermore, early planting can be carried out in pearl millet, because of its response to low initial soil moisture

Mots clés : Agronomy Agronomy Plant diseases Horticulture Botany Agronomy Botany

Annonce : EThOS)

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