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Simulating Leaf Appearance in Rice

^a Dep. de Fitotecnia, Centro de Ciências Rurais, Univ. Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil
^b Programa de Pós-graduação em Agronomia, Univ. Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil

View larger version (14K): [in this window] [in a new window]   Fig. 1. (a) The temperature response function (Eq. [2, 3]) in the Wang and Engel (WE) and Streck leaf appearance models with cardinal temperatures for rice of 11, 26, and 40°C; (b) the chronology response function (Eq. [4, 5]) used in the Streck leaf appearance model; (c) method of calculating daily values of thermal time (TT; Eq. [7, 8]) for leaf appearance in rice with cardinal temperatures of 11, 26, and 40°C.

View larger version (40K): [in this window] [in a new window]   Fig. 2. Predicted vs. observed values of main stem Haun Stage in rice using the three leaf appearance rate (LAR) models [Streck; Wang and Engel (WE); phyllochron]. Data are pooled for seven rice cultivars [IRGA 421, IRGA 420, IRGA 416, IRGA 417, BRS 7 (TAIM), BR-IRGA 409, and EPAGRI 109] sown on 10 dates in pots at Santa Maria, RS, Brazil, during three growing seasons (2004–2005, 2005–2006, and 2006–2007). Panels a, b, and c are data when the simulation started at emergence. Panels d, e, and f are data when the simulation started at the day of the first observed Haun Stage. The solid line is the 1:1 line.

View larger version (34K): [in this window] [in a new window]   Fig. 3. Predicted vs. observed values of main stem Haun Stage in rice using the three leaf appearance rate (LAR) models [Streck; Wang and Engel (WE); phyllochron]. Data are pooled for two rice cultivars (IRGA 421 and EPAGRI 109) sown on two dates in a paddy rice field at Santa Maria, RS, Brazil, during the 2006–2007 growing season. Panels a, b, and c are data when the simulation started at emergence. Panels d, e, and f are data when the simulation started at the day of first observed Haun Stage. The solid line is the 1:1 line.

View larger version (19K): [in this window] [in a new window]   Fig. 4. Observed main stem Haun Stage and values predicted by the Streck model for (a) ‘BR-IRGA 409’ rice grown in pots in five sowing dates [2 Sept. 2004 (DOY = 245), 7 Oct. 2004 (DOY = 280), 4 Nov. 2004 (DOY = 308), 3 Dec. 2004 (DOY = 337) and 2 Mar. 2005 (DOY = 61)] and for (b) ‘IRGA 421’ and (c) ‘EPAGRI 109’ rice grown in the paddy rice field in two sowing dates [13 Dec. 2006 (DOY = 347), and 16 Jan. 2007 (DOY = 16)]. Santa Maria, RS, Brazil, 2004–2007.