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Published in Crop Sci 14:365-367 (1974)
© 1974 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Model for Predicting Emergence of Grain Sorghum1

R. D. Horrocks and F. D. Cloninger2

Six planting depths (1.3 to 7.6 cm in 1.27-cm increments) and five day/night temperature regimes (17/7C to 37/27C in 5/5C increments) were used to develop a model capable of predicting grain sorghum (Sorghum bicolor (L.) Moench.) emergence. Polynomial components in the analysis of variance indicated that 24 variables were significant at the 1% level. Regression analysis showed that these 24 variables accounted for 92% of the variation in the observed emergence. The standard error of the estimate was 11.0%. The model generally predicted less emergence at the lower temperatures and more at the higher temperatures than was observed. Only recently have some physical, biological, and physiological processes relating to plant growth been defined mathematically. The quantification reported here adds to the growing list. Its utility lies in three areas: 1) in its present form we are able to make reasonably accurate estimates of emergence if the soil water supply is adequate; 2) it can serve as a definition for one of the steps in the complete plant-production system; and 3) it will serve as a basis for developing a more sophisticated model as additional data become available.

Key Words: Polynomial components • Planting depth • Soil temperature

1 Contribution of the Department of Agronomy, Missouri Agricultural Experiment Station. Journal Series Number 6666. Approved March 12, 1973.

2 Associate Professor of Agronomy. University of Missouri, Columbia, MO 65201; and Plant Breeder, The Robinson Seed Co., Waterloo, NE 68069.

Received for publication March 28, 1973.




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