Modeling the seed emergence rate of two plant species cultivars in field conditions


  • Mohammad Reza Shahsavari Horticulture Crops Research Department, Isfahan Agricultural and Natural Resources Research and Education Center, AREEO, Isfahan, Iran.
  • Talat Yasari Department of Science, Zabol University, Zabol, Iran.


Emergence, Modeling, Safflower, Soybean, Temperature


The plant's vital cycle begins with seed germination in the soil. The length and seed rate emergence depends on the temperature, moisture and oxygen of soil and the quality of the seedbed. In irrigation conditions, temperature is one of the most influential factors on the emergence stage. In order to determine the seed emergence rate of safflower and soybean cultivars, planting dates of these cultivars during different years in research fields of Isfahan province were used. To determine the emergence rate the length of emergence period inversed. Emergence rate considered as dependent variable and thermal factors were used as independent variables in the stepwise regression. With increasing temperature, the length of the emergence period decreased. The coefficients of determination for determining the rate of emergence stage for safflower cultivars namely Arak, Sofeh and Goldasht, were 75.99, 69.75 and 76.07 percent respectively, and for soybean cultivars namely Hack, Williams and Steel,  were 63, 70.4 and 70.2 percent respectively. Based on the results, the contribution of heat parameters to determining the seed emergence rate of different cultivars is not constant.


Arechiga, M.R., Carlos, V., 2000. Cactus seed germination a review. J. Arid Environ., 44, 85-104.

Cirak, C., Ayan, A., Kevseroglu, K., 2004a. The effects of light and some pre-soaking treatments on germination rate of St. John’s worth (Hypericum perforatum L.) seeds. Pak. J. Biol. Sci., 7, 182-186.

Cirak, C., Ayan, A., Kevseroglu, K., Caliskan, O., 2004b. Germination rate of St. John’s worth (Hypericum perforatum L.) seeds exposed to different light intensities and illumination periods. J. Biol. Sci., 4, 279-282.

Fehr, W.R., Caviness, C.E., Burmood, D.T., Peningtton, J.S., 1971. Stage of development description for soybean. Crop Sci., 11, 929-931.

Flores, J., Briones, O., 2001. Plant life-form and germination in a Mexican inter-tropical desert: effects of soil water potential and temperature. J. Arid Environ., 47, 485-497.

Hakansson, I., Myrbeck, A., Ararso, E., 2002. A review of research on seedbed preparation for small grains in Sweden. Soil Till Res., 64, 23-40.

Khajehpour, M.R., 1997. Fundamentals of agriculture. 2 th-ed. Jehadeh- Daneshgahi.

Robertson, G.W., 1983. Weather based mathematical models for estimating development and ripening of crop. Technical Note, 180, 1-99.

Seefeldr, S.S., Kimberlee, K., John, E., 2002. Base growth temperatures, germination rates and growth response of contemporary spring wheat cultivars from the US Pacific Northwest. Field Crop. Res., 75, 47-52.

Villalobos, A.E., Pelaez, D.V., 2001. Influences of temperature and water stress on germination and establishment of Prosopis caldenia Burk. J. Arid Environ., 49, 321-328.

Zadeh, F.S., Alistair, J.M., 2001. The effect of temperature and moisture on after-ripening of Cenchrus ciliaris seds. J. Arid Environ., 49, 823-831.



How to Cite

Shahsavari, M. R. ., & Yasari, T. . (2021). Modeling the seed emergence rate of two plant species cultivars in field conditions. Scientific Journal of Crop Science, 10(3), 470-476. Retrieved from



Original Article