Environment-dependent logistic equations applied to natural pasture growth curves
✍ Scribed by Daniel Wallach; Mario Gutman
- Book ID
- 102980242
- Publisher
- Elsevier Science
- Year
- 1976
- Weight
- 811 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0002-1571
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✦ Synopsis
Wallach, D. and Gutman, M., 1976
. Environment-dependent logistic equations applied to natural pasture growth curves. Agric. Meteorol., 16: 389--404.
Logistic equations, in which the relative growth rates are assumed to be functions of daily radiation, temperature, and soil moisture, are fitted to the growth curves of two natural pastures in Israel. Two functional forms for R, the relative growth rate, are considered. R as a product of a maximum relative growth rate and sigrnoid reduction factors due to the environmental variables gives better results than R as a linear function of environmental variables. The best model at one site contains reduction factors due to radiation and soil moisture. At the other site the best model contains reduction factors due to all three environmental variables. In all cases the best soil moisture reduction factor is nearly a step function. The maximum relative growth rates are 9.4%]day for the first site and 10%/day for the second site.
INTRODUC~ON