Prediction of sunflower grain oil concentration as a function of variety, crop management and environment using statistical models
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- 作者：Fety Nambinina Andrianasolo ; Pierre Casadebaig ; Elie Maza ; Luc Champolivier ; Pierre Maury ; Philippe Debaeke
- 关键词：GAM ; Genotype by environment interaction ; Regression model ; Sunflower oil concentration
- 刊名：European Journal of Agronomy
- 出版年：March, 2014
- 年：2014
- 卷：54
- 期：Complete
- 页码：84-96
- 全文大小：1595 K
文摘
Sunflower (Helianthus annuus L.) raises as a competitive oilseed crop in the current environmentally friendly context. To help targeting adequate management strategies, we explored statistical models as tools to understand and predict sunflower oil concentration. A trials database was built upon experiments carried out on a total of 61 varieties over the 2000-2011 period, grown in different locations in France under contrasting management conditions (nitrogen fertilization, water regime, plant density). 25 literature-based predictors of seed oil concentration were used to build 3 statistical models (multiple linear regression, generalized additive model (GAM), regression tree (RT)) and compared to the reference simple one of based on 3 variables. Performance of models was assessed by means of statistical indicators, including root mean squared error of prediction (RMSEP) and model efficiency (EF). GAM-based model performed best (RMSEP = 1.95%; EF = 0.71) while the simple model led to poor results in our database (RMSEP = 3.33%; EF = 0.09). We computed hierarchical contribution of predictors in each model by means of R2 and concluded to the leading determination of potential oil concentration (OC), followed by post-flowering canopy functioning indicators (LAD2 and MRUE2), plant nitrogen and water status and high temperatures effect. Diagnosis of error in the 4 statistical models and their domains of applicability are discussed. An improved statistical model (GAM-based) was proposed for sunflower oil prediction on a large panel of genotypes grown in contrasting environments.