期刊论文详细信息
Pesquisa Agropecuária Brasileira
Simulation of growth and development of irrigated cowpea in Piauí State by CROPGRO model
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
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【 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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