Dr. A. Elings
Centro International de Mejoramiento de Mais y trigo (CIMMYT)
Apdo. Postal 6-641
MEXICO Phone: +.595.54400/54410
Fax : +595.54425
BLIGHT is a combination model with sections on crop growth and development, and sections which account for the plant x disease interaction. The crop sections are, apart from some minor changes, very similar to ORYZA_1*. Effects of the disease on crop growth processes comprise the effects on the characteristics of the photosynthesis light response curve. Effects of the disease on crop on green leaf and stem area, dry matter partitioning, leaf nitrogen content, and relative senescence rate are described in the input data. These and other plant characteristics have to be introduced as forcing functions. Three types of leaf area are introduced into the model, viz. as fractions healthy and diseased leaf area, from which fraction dead leaf area is calculated. Diseased leaf area and diseased stem area are described by their respective disease severities. In contrast to ORYZA_1*, in which a single leaf layer is considered, in BLIGHT the canopy is subdivided into three layers which are characterized separately. (Photosynthesis rates per canopy layer are combined to daily gross canopy photosynthesis.) The effects on photosynthesis of diseased leaf area are introduced into the model as correction factors related to disease severity on the initial light use efficiency and the assimilation rate at light saturation. Similarly, the maintenance respiration of diseased leaf area is given a correction factor. Photosynthesis rates of healthy and dead leaf area are assumed to be unaffected and zero, respectively.
Author of the abstract:
CAMASE Register of Agro-ecosystems Models
Reddy, P.R., 1994. Simulation of the effect of Bacterial Blight disease on crop growth and yield of rice. SARPinternal publication, 46 pp.
Elings, A. & E.G. Rubia (Eds.), 1994. SARP Research Proceedings. (in prep.)