title: [Compensation effects of regulated deficit irrigation and tillering interference to winter wheat].
abstract: Pot experiments were carried out to explore the approach of optimizing crop group performance through restriction of individual growth redundancy and increasing crop yield potential. Two winter wheat varieties of 'Xiaoyan-22' (with moderate tillering ability) and 'Zhengmai-7698' (with strong tillering ability) were chosen to investigate the effects of two irrigation schedules (full irrigation and regulated deficit irrigation) and three kinds of tillering interference (only retaining the main stem and the biggest tiller at jointing stage; removing all nonbearing tillers at heading stage; and without any interference as the control treatment). Thus, we simulated the compensation effects of different water supplies and unpredictable disturbances on the physiology, growth, yield, and water use efficiency of winter wheat. The results showed that there existed growth redundancy for both varieties. Compared with 'Xiaoyan-22', 'Zhengmai-7698' had relatively higher tillering number but weak panicle traits. Regulated deficit irrigation and removing all nonbearing tillers at heading stage could reduce growth redundancy, weaken competitive ability, change source-sink relations, and optimize resources allocation. However, excessive elimination of redundancy (e.g. only retaining the main stem and the biggest tiller at jointing stage) could destroy the inherent root-shoot balance and functional structure of plant and lead to inadequate compensation. In contrast to the control treatment (full irrigation and without any disturbance), the combination of regulated deficit irrigation and removing all nonbearing tillers at heading stage could help crops sufficiently exploit and utilize their own regulation potentials at spatial and temporal scales and finally realize compensation growth. The combination above could increase the water use efficiency by 20.4% - 25.4% without remarkable impact on grain yield, and hence, could be suitable for wheat growth redundancy reduction.
authors.forename: Min-hua
authors.initials: MH
authors.lastname: Yin
authors.forename: Yuan-nong
authors.initials: YN
authors.lastname: Li
authors.forename: Chang-ming
authors.initials: CM
authors.lastname: Zhou
authors.forename: Xiao-bo
authors.initials: XB
authors.lastname: Gu
authors.forename: Tian-le
authors.initials: TL
authors.lastname: Zhang
authors.forename: Dan
authors.initials: D
authors.lastname: Yang
authors.forename: Guo-jun
authors.initials: GJ
authors.lastname: Wu
mesh_terms: D057914:Agricultural Irrigation; D002523:Edible Grain; D018547:Plant Stems / Q000502:physiology; D014908:Triticum / Q000254:growth & development* / Q000502:physiology; D014867:Water / Q000502:physiology*
chemical_list: D014867:Water