SSM-iLegume

SSM-iCrop was substituted for SSM-iLegume. We no longer update SSM-iLegume. SSM-iCrop and SSM-iCrop2 and SSM-iCrop2N are our active versions.

SSM-iLegume is a model to simulate grain legumes such as soybean, chickpea, peanut, dry bean and cowpea. The model was derived from the general model described in the book. The differences between these two models are:

• Phenological stages of emergence, R1, R3, R5, R7 and R8 which are well-known crop stages in grain legumes are predicted based on temperature and photoperiod.
• Leaf growth and seed growth may have overlap unlike what was assumed in the book. This modification was necessary especially for peanut.
• Yield formation is simulated as described for SSM-chickpea. That is, yield formation is simulated based on linear increase in harvest index, but daily seed growth rate is limited to current crop photosynthesis plus daily rate mobilized dry matter from vegetative organs. Slope of linear increase in harvest index is adjusted for pre-seed growth conditions experienced by the crop. Crop mass at beginning seed growth is used as an indicator of the conditions.

SSM-chickpea is a model for chickpea development, growth and yield (Soltani and Sinclair, 2011). The model is based on an older chickpea model (Soltani et al., 1999) which was revised and improved in the light of new quantitative findings in this crop (Soltani et al., 2005; 2006abcde).

The model can be downloaded from this page (please see the bottom of the page).

The model is similar to the general model described in the book, except for yield formation. Yield formation is simulated based on linear increase in harvest index, but daily seed growth rate is limited to current crop photosynthesis plus daily rate of mobilized dry matter from vegetative organs. Slope of linear increase in harvest index is adjusted for pre-seed growth conditions experienced by the crop. Crop mass at beginning seed growth is used as an indicator of the conditions.

For more information refer to:

Soltani, A., Ghassemi-Golezani, K., Rahimzadeh-Khooie, F., Moghaddam, M., 1999. A simple model for chickpea growth and yield. Field Crops Res. 62, 213-224.

Soltani, A., F. R. Khooie, K. Ghassemi-Golezani, and M. Moghaddam. 2000.  Thresholds for chickpea leaf expansion and transpiration response to soil water deficit. Field Crops Res. 68: 205-210.

Soltani, A., Khooie, F.R., Ghassemi-Golezani, K., Moghaddam, M., 2001. A simulation study of chickpea crop response to limited irrigation in a semiarid environment. Agric. Water Manag. 49: 225-237.

Soltani, A., Torabi, B., Zeinali, E., Sarparast, R., 2004. Response of chickpea to photoperiod as a qualitative long-day plant. Asian J. Plant Sci. 3(6), 705-708.

Soltani, A., Torabi, B., Zarei, H., 2005. Modeling crop yield using a modified harvest index-based approach: Application in chickpea. Field Crops Res. 91, 273-285.

Soltani A., Robertson, M.J., Torabi, B., Yousefi-Daz, M., Sarparast, R., 2006a. Modeling seedling emergence in chickpea as influenced by temperature and sowing depth. Agric. For. Meteorol. 138: 156-167.

Soltani A., Hammer, G.L., Torabi, B., Robertson, M.J., Zeinali, E., 2006b. Modeling chickpea growth and development: phenological development. Field Crops Res. 99: 1-13.  

Soltani A., Robertson, M.J., Mohammad-Nejad, Y., Hammer, G.L., 2006c. Modeling chickpea growth and development: leaf production and senescence. Field Crops Res. 99: 14-23. 

Soltani, A., M.J. Robertson, A. Rahemi-Karizaki, J. Poorreza, and H. Zarei. 2006d.Modeling biomass accumulation and partitioning in chickpea (Cicer arietinum L.). J. Agron. Crop Sci. 192: 379-389.  

Soltani A., Robertson, M.J., Manschadi, A.M., 2006e. Modeling chickpea growth and development: nitrogen accumulation and use. Field Crops Res. 99: 24-34.

Soltani, A., Sinclair, T.R., 2011. An improved model of chickpea growth and yield. Field Crops Res. 124: 252-260.