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CROP BREEDING & GENETICS

Determination of Cultivar Coefficients of Peanut Lines for Breeding Applications of the CSM-CROPGRO-Peanut Model

^a Dep. of Agronomy, Faculty of Agriculture, Khon Kaen Univ., Khon Kaen 40002, Thailand
^b Dep. of Biological and Agricultural Engineering, the Univ. of Georgia, Griffin, GA 30223-1797, USA

^* Corresponding author (aran{at}kku.ac.th).

Breeding applications of a crop simulation model require cultivar coefficients for a large number of breeding lines, making the recommendation to determine these coefficients from field experiments conducted over several environments impractical. The objective of this study was to confirm our earlier findings that experimental data from only two seasons are sufficient to determine the cultivar coefficients of peanut lines for breeding applications of the CSM-CROPGRO Peanut model. Seventeen peanut lines varying in yield level, seed type and maturity duration were selected for this study and were grown during the 2002 rainy and 2003 dry seasons. Data were collected on plant development and growth characteristics and were then used for model calibration to determine the cultivar coefficients of the individual peanut lines. A separate experiment was conducted in the dry season of 2004 for model evaluation. The calibration resulted in cultivar coefficients that provided simulated values of the various traits that were close to their corresponding observed values. Similar results were obtained for model evaluation with an independent data set. Differences among peanut lines were also expressed in the derived cultivar coefficients. These results confirmed our earlier finding that the cultivar coefficients of peanut lines derived from detailed experimental data for two seasons are sufficiently accurate for breeding applications of the CSM-CROPGRO-Peanut model.

Abbreviations: CV, coefficient of variation • CSDL, critical daylength for photoperiod • EMFL, emergence to flowering • FLLF, first flowering to end of leaf expansion • FLSD, first flowering to first seed • FLSH, first flowering to first pod • LAI, leaf area index • LFMAX, maximum leaf photosynthetic rate • PD, photothermal days • PODUR, time required for a cultivar to reach final pod load • PPSEN, sensitivity to photoperiod • RMSE, root mean square error • SFDUR, seed filling duration for an individual pod cohort • SDPM, first seed to physiological maturity • SIZELF, maximum size of a full leaf • SLA, specific leaf area • SLAVR, specific leaf area • SLPF, soil fertility factor • SDPDV, averaged seed number per pod • WP, wettable powder • WTPSD, individual seed size • XFRT, maximum fraction of daily growth that is allocated to seed and shell.