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New Perennial Forage Model in DSSAT 4.7

We are pleased to announce the release of the CSM-CROPGRO-Perennial-Forage model in DSSAT Version 4.7, complete with species adaptations and data files for three perennial forages:  Brachiaria brizantha Stapf cv. Marandu, ‘Tifton 85’ bermudagrass (Cynodon spp.), and alfalfa (Medicago sativa L.) cv. Aragón.

The CROPGRO Perennial Forage Model (CROPGRO-PFM) was developed from the annual crop version of CROPGRO by Rymph (2004) in order to allow simulations with periodic partial to complete defoliation and subsequent regrowth using newly added state variables for storage of carbohydrate and nitrogen reserves in a new storage tissue type (stolon, rhizome, crown, taproot), along with rules for use and re-fill of those reserves for re-growth even after complete defoliation or surface winter-kill. From 2004 until recently, this model version had remained as a standalone model outside of the DSSAT shell, even while its species, ecotype, and cultivar files were adapted to simulate growth responses of several perennial forage genotypes such as Paspalum notatum Flüegge cv. Pensacola (Rymph, 2004; Rymph et al., 2004), Brachiaria brizantha Stapf cv. Xaraés (Pedreira et al., 2011), Panicum maximum Jacq cv. Tanzânia (Lara et al., 2012), Brachiaria brizantha Stapf cv. Marandu (Pequeno et al., 2014), ‘Tifton 85’ bermudagrass (Cynodon spp.), and Brachiaria hybrid cv. Mulato II (CIAT 36061) (Pequeno et al., 2017).

In 2017, the CROPGRO-PFM was brought into the Cropping System Model code and shell of the DSSAT Version 4.7 release, with species parameterization and data files for Brachiaria brizantha Stapf cv. Marandu and ‘Tifton 85’ bermudagrass (Cynodon spp.) from Pequeno et al. (2017) and alfalfa (Medicago sativa L.) cv. Aragón dormancy group 7 (Malik et al., 2018).

For further information and complete references, see the main page for CSM-CROPGRO-Perennial-Forage.

Jeffrey White

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