By R. Sattler
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0 based on four critical curve definition points. ACSTF is a soil temperature factor that affects potential and actual N-fixation rates. ACSTG is a soil temperature factor that affects nodule growth rate. FLDSUM is related to excess soil moisture and affects N-fixation rates. 0) FLDSUM = FLDSUM + DLAYR(I) * FLAYR * CURV(TYPFXW,FNFXW(1),FNFXW(2),FNFXW(3),FNFXW(4),EPORS) These factors are then divided by DNOD, the depth of the nodule zone, to yield the nodule growth and fixation factors, TNFIX, TNGRO, and FLDACT: TNFIX = ACSTF / DNOD TNGRO = ACSTG / DNOD FLDACT = FLDSUM / DNOD Other factors that are computed are SWFACT, a drought factor based on TURFAC (water stress factor), and NFXAGE, which determines the effect of canopy age on N growth rates: SWFACT = CURV(TYPFXD,FNFXD(1),FNFXD(2),FNFXD(3), FNFXD(4),TURFAC) NFXAGE = CURV(TYPFXA,FNFXA(1),FNFXA(2),FNFXA(3), FNFXA(4),DXR57) A running average of the last 8 days of water deficit factor (SWFACT) is kept.
Godwin, B. Baer, K. J. Boote, J. T. Ritchie, and J. W. White. 1994. Crop models. In DSSAT Version 3, ed. G. Y. Tsuji, G. Uehara, and S. Balas, vol. 2, 95–244. Honolulu: Univ. of Hawaii. , J. W. Jones, P. W. Wilkens, C. H. Porter, W. D. Batchelor, L. A. Hunt, K. J. Boote, U. Singh, O. Uryasev, W. T. Bowen, A. J. Gijsman, A. du Toit, J. W. White, and G. Y. Tsuji. 2004. 0 [CD-ROM]. University of Hawaii, Honolulu, HI. Jones, J. , G. Hoogenboom, C. H. Porter, K. J. Boote, W. D. Batchelor, L. A. Hunt, P.
The input data includes curve information for determining the effect of temperature, canopy age, dry soil, and wet soil on N fixation and nodule growth rates. 2 Seasonal Initialization Several variables are set to zero at the beginning of each season of simulation in the “Seasonal Initialization” section. 3 Rate/Integration The N2 fixation component in CROPGRO has been changed considerably since the earlier versions in 1992–1993. There is a thermal-time requirement for initiating first-nodule mass.