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Lanzhou University (2009)

The Relationship between Competitive Ability and Yield of Spring Wheat Varieties in Semiarid Area

Zhou Wei Jia

Titre : The Relationship between Competitive Ability and Yield of Spring Wheat Varieties in Semiarid Area

Auteur : Zhou Wei Jia

Grade : Master’s Theses 2009

Université : Lanzhou University

Using the deWit alternative family law, Daejeon and potted two experimental way. Research semi-arid regions of three spring wheat varieties explore the semi-arid regions - head monk, Longchun -8275, given the competitiveness of the West -24, water use efficiency and yield characteristics of spring wheat The relationship between competitiveness and yield. Daejeon the experimental selection monk head, Longchun -8275 as experimental material, the use of a simplified the deWit alternative series method to carry out the experimental set up two water treatments, two varieties of unicast and 1:1 mixed sowing two cultivation methods. Pot experiment, two water treatment, head monk, Longchun -8275, given the combination of two of the West -24 three varieties form three Mixed Composition, two varieties of each portfolio in accordance with the 100% S1 75% S1 25% S2, 50 ? 50% of S2, 25 ? ratio of 75% of S2 and 100% S2 seeding experiment the total processing of three varieties unicast × 2 water processing water treatments Mixed Composition 3 Mixture Proportion × 3 × 2 = 24 processing . The two parts of the experiment the following results : 1. The Daejeon experimental results show : unicast, photosynthetic rate Longchun -8275> monk head. The mixed sowing under Adequate Water Supply, Longchun -8275 photosynthetic rate greater than the head monk. Sufficient water supply under the conditions of the two species of photosynthetic rate than the drought to be high. 2. Daejeon experimental results show : two water treatment conditions, Unicast, the head monk of flag leaf chlorophyll peak in the first 15d after flowering, mixed sowing time, all appear in the first 10d, visible moisture conditions monk head of chlorophyll changes affect not large. Drought treatment, the chlorophyll content of mixed sowing varieties peak higher than the peak unicast and than the unicast peak appeared earlier. The 3. Varieties Heshangtou, Dingxi -24 aboveground biomass, root biomass, tiller number, representing more than -8275 Longchun Longchun -8275 crown root ratio, harvest index than monk head and Dingxi -24. 4 unicast yield Longchun -8275> Heshangtou> to Dingxi -24. Relatively the root the amount obtained by analyzing the mixed culture of root biomass, roots competitiveness Sort by analyzing mixed sowing yield varieties competitiveness relative yield and competitive outcomes Sort consistent : the Dingxi -24> the monk head> Longchun -8275. Water use efficiency Longchun -8275 highest, followed by Dingxi -24, the head monk. The results show that the weak a higher yield Longchun -8275 competitiveness, high water use efficiency and, lower yields Dingxi 24 and head monk competitiveness and low water use efficiency.

Mots clés : Competitiveness of roots Competitiveness Water use efficiency Growth redundancy Yield

Présentation (Dissertation Topics)

Page publiée le 25 octobre 2014, mise à jour le 11 mars 2018