Modelling growth responses of annual legumes to water shortage
2008
Vrahnakis, M.S.; Kostopoulou, P., Technological Educational Institute of Larisa, Karditsa (Greece). School of Forestry and Management of Natural Environment | Lazaridou, M.; Merou, T.; Fotiadis, G., Technological Educational Institute of Kavala, Drama (Greece). School of Forestry and Management of Natural Environment
Knowing growth changes of plants as a response to environmental constraints is essential in management. The acquisition of this knowledge can be greatly facilitated by testing several growth models and chosing the best in terms of fitting. The present research models growth responses of three annual legumes [Trifolium angustifolium L., Medicago disciformis DC., and Onobrychis caput-galli (L.) Lam.] to water shortage. The plants were left to grow as monocultures (nine plants) in pots. Two irrigation treatments were applied: (i) full irrigation (at field capacity); and (ii) low irrigation (40 per cent of the field capacity). There were three replications for each treatment. After seedling emergence, plant height was recorded approximately every four days. Twelve growth models were tested to find out the best in terms of fitting. Model diagnosis was based on the residual sum of squares, the Akaike information criterion, and the Schwarz criterion. The four-parameter Janoschek's model simulates best the growth pattern of T. angustifolium and M. disciformis and the four-parameter Morgan-Mercer-Flodin's model is appropriate for simulating the growth of O. caput-galli. There was not any differentiation between treatments regarding the best model selection. The suitability of models in terms of prediction is further discussed
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