Stewart, D.W. and Dwyer, L.M. and Carrigan, L.L. (1998) Phenological temperature response of maize. Agronomy Journal, 90 (1). pp. 73-79.
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Abstract
Variability of development rate estimates across locations and years using the current heat unit system of growing degree-days (GDD) with maximum and minimum temperature thresholds of 30 and 10°C (GDD30,10) limits predictability of maturity in hybrid maize (Zea mays L.). Data sets of daily maximum and minimum air temperatures and dates of maize development stages were collected for a range of hybrids at locations in Canada and the northern USA (39° to 45° N lat). Data were analyzed to improve the temperature response functions for maize at different stages of development. Results indicate that during vegetative growth, phenological response to mean daily air temperature followed a sigmoidal curve beginning below 5°C, with maximum response to temperatures between 25 and 30°C. During reproductive growth, the temperature response function was flat from 0 to 12°C and rose significantly only with mean daily air temperatures greater than this range. A general thermal index (GTI) based on these two response functions improved estimation of maturity dates by 50% over estimates made using GDD30,10 (SE of 6.7 d for GTI and 13.6 d for GDD30,10 in estimating time from planting to maturity). The greatest improvement using GTI occurred for the reproductive period (SE of 5.8 d using GTI, compared with 12.1 d using GDD30,10). These results suggest that incorporating the temperature response function reported in this paper would improve prediction of maize development.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Agric. & Agri-Food Canada, Eastern Cereal & Oilseed Res. Ctr., Ottawa, ON K1A OC6, Canada |
| Subjects: | Plant Physiology and Biochemistry > Biochemistry |
| Divisions: | Maize |
| Depositing User: | Sandhya Gir |
| Date Deposited: | 06 Feb 2011 22:19 |
| Last Modified: | 06 Feb 2011 22:19 |
| Official URL: | http://dx.doi.org/10.2134/agronj1998.0002196200900... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/1479 |
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