Study on the impact of water deficit on agronomic characters of sunflower based on gray relational projection model

The paper applies gray relational projection model to analyze agronomic traits of water deficit at five different growth stages. The results show that an order relationship is that the water deficit scheme of seeding, eight pairs true leaf stage, maturity stage, inflorescence formation stage and flowering stage, which better reflects the critical period of sunflower. So we can allocate the limited water resource rationally and effectively and make agronomic traits achieve comprehensive optimal. At the same time, the evaluation results and the actual results are better consistent through applying gray relational projection method, which shows that the model is feasible during the analysis on water defict for agronomic traits of sunflower.