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Leaf expansion is an important factor determining the competitive ability of a crop or weed. Crop models for leaf expansion have been under study and development for some time; we report here an explo...ratory effort to develop a similar information base for weed models. Such models summarise what is known about plant behavior; study of crop: weed competition models may lead to better methods for weed control and better predictions of crop yield. Crop and weed plants were grown in growth cabinets to determine the effect of temperature on leaf appearance rate; such information was used to develop speciesspecific degree day models for germination, seedling emergence to the first leaf, and the appearance of successive mainstem leaves. Total leaf area was measured on seedlings with a range of mainstem leaf numbers, in both controlled environment and field conditions. Area per plant vs. accumulated degree days could then be determined from the predicted mainstem leaf number, using the degree day models and derived, allometric relationships between leaf numbers and accumulated area. A method for estimating threshold temperatures for leaf expansion was also developed. Limitations to such a simple model for predicting seedling leaf area are discussed, with an indication of improvements needed.show more
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Export Mendeley
KJ00004506745