Simulation of growth and development of irrigated cowpea in Piauí State by CROPGRO model

Pesquisa Agropecuária Brasileira

Edson Alves Bastos²  Marcos Vinícius Folegatti¹  Rogério Teixeira De Faria¹  Aderson Soares De Andrade Júnior²  Milton José Cardoso² 

[1] ,Embrapa-Centro de Pesquisa Agropecuária do Meio-NorteParnaíba PI

关键词: Vigna unguiculata;    models;    climatic factors;    edaphic factor;    water availability;    DSSAT;    Vigna unguiculata;    modelo;    fator climático;    fator edáfico;    disponibilidade hídrica;    DSSAT;   

DOI  :  10.1590/S0100-204X2002001000005

来源: SciELO

【 摘 要 】

The objective of this work was to adapt the CROPGRO model, which is part of the DSSAT system, for simulating the cowpea (Vigna unguiculata) growth and development under soil and climate conditions of the Baixo Parnaíba region, Piauí State, Brazil. In the CROPGRO, only input parameters that define crop species, cultivars, and ecotype were changed in order to characterize the cowpea crop. Soil and climate files were created for the considered site. Field experiments without water deficit were used to calibrate the model. In these experiments, dry matter (DM), leaf area index (LAI), yield components and grain yield of cowpea (cv. BR 14 Mulato) were evaluated. The results showed good fit for DM and LAI estimates. The medium values of R² and medium absolute error (MAE) were, respectively, 0.95 and 264.9 kg ha-1 for DM, and 0.97 and 0.22 for LAI. The difference between observed and simulated values of plant phenology varied from 0 to 3 days. The model also presented good performance for yield components simulation, excluding 100-grain weight, for which the error ranged from 20.9% to 34.3%. Considering the medium values of crop yield in two years, the model presented an error from 5.6%.

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