Phasic development in field crops I. Thermal response in the seedling phase

Angus, J.F. and Cunningham, R.B. and Moncur, M.W. and Mackenzie, D.H. (1981) Phasic development in field crops I. Thermal response in the seedling phase. Field crops Research, 3 (4). pp. 365-378.

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A study is described in which cultivars of 44 species of field crops were sown at monthly intervals at three site in eastern Australia, and observations made on the duration of the developmental phases. The aim of the work was to devise models and estimate parameters for predicting phasic development in whole crop simulations. In this paper we describe the effect of temperature on the time from sowing to emergence. A number of different models was investigated including linear and non-linear equations using daily mean temperature. We also compared the use of soil temperature with screen temperature and the use of daily mean temperatures with temperatures measured at 2-h intervals. Of all the systems used the modified linear day-degree system with daily steps of mean screen temperature was found to be the most satisfactory for our purpose and not significantly inferior to any other model tested. Parameters of equations for predicting emergence for 30 of the 44 species are presented. The other 14 are temperate species which apparently suffered delayed emergence in our experimental conditions. The results are discussed in terms of the ecological and physiological significance which may be placed on the base temperature used in the day-degree system.

Item Type: Article
Additional Information: SNNigam Collection
Author Affiliation: Division of Land Use Research, CSIRO, Canberra City, A.C.T., Australia 2601.
Subjects: Plant Production
Statistics and Experimentation
Crop Improvement
Divisions: General
Depositing User: Mr B Krishnamurthy
Date Deposited: 02 Aug 2013 07:52
Last Modified: 02 Aug 2013 07:53
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