| Effects of water and nitrogen interaction on root characteristics and yield of Zhengmai 9023 during grain filling stage |
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| DOI：10.7606/j.issn.1000-7601.2016.02.08 |
| Key Words: wheat water and nitrogen coupling root character yield |
| Author Name | Affiliation | | XU Guo-wei | Agricultural College, Henan University of Science and Technology, Luoyang, Henan 471003, China | | SUN Meng | Agricultural College, Henan University of Science and Technology, Luoyang, Henan 471003, China | | WANG He-zheng | Agricultural College, Henan University of Science and Technology, Luoyang, Henan 471003, China | | CHEN Ming-can | Agricultural College, Henan University of Science and Technology, Luoyang, Henan 471003, China | | LI You-jun | Agricultural College, Henan University of Science and Technology, Luoyang, Henan 471003, China |
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| Abstract: |
| The purpose of this study was to investigate leaf senescence and yield differences by three nitrogen levels and two water treatments during grain filling stage under the condition of nitrogen and water coupling. A winter wheat cultivar Zhengmai 9023 was grown in the field. Root activity, total absorbing surface area, activity absorbing surface area and total organic acid in root, as well as yield, were measured at 7 and 21 day after flowing stage. The results showed that root physiological indexes, such as root activity, total absorbing surface area, activity absorbing surface area and total organic acid content, were increased first and became decreased later with the increase of nitrogen application amount. Compared the treatment with 200 kg·hm-2 (N2), root physiological indexes including Root activity, total absorbing surface area, activity absorbing surface area and total organic acid content by 300 kg·hm-2 (N3) treatment were decreased by 13.5%, 9.0%, 8.2% and 20.9%. Compared with the control (-25 kPa), total absorbing surface area, activity absorbing surface area and total organic acid content in root became increased under -60 kPa water stress when nitrogen level remains the same. In particular, the effect was very predominant by N3 treatment. For yield, under the same water treatment, with the increase of nitrogen application, wheat yield went increased first and then became decreased. Compared with N1 treatment, wheat yields were increased by 72.1% and 61.4% by N2 and N3, respectively. Yield by N3 treatment was 6.6% lower than that by N2. With the same nitrogen fertilization, wheat production after water stress was improved, which was nevertheless significantly different from the control. Correlation analysis showed that there were significantly and extremely significant positive correlations between root activity, absorption surface area, total organic acid content and the yield, indicating that root physiological activity is enhanced by proper water stress during wheat filling stage and N2. The production can be facilitated thereby. |
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