| Effects of water\|nitrogen interaction on dry matter accumulation, transport and grain filling characteristics of spring wheat |
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| DOI：10.7606/j.issn.1000-7601.2024.06.10 |
| Key Words: drip\|irrigated spring wheat water\|nitrogen interaction dry matter accumulation and transport grain filling characteristic grain weight |
| Author Name | Affiliation | | HE Fangfang | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832000, China | | YANG Longlong | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832000, China | | JIANG Guiying | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832000, China | | GUO Rougu | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832000, China | | LEI Qiqi | College of Agronomy, Shihezi University, Shihezi, Xinjiang 832000, China | | XU Hongjun | Crop Research Institute, Xinjiang Agricultural Reclamation Academy, Shihezi, Xinjiang 832000, China |
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| Abstract: |
| In order to explore the dry matter accumulation, transport and grain filling characteristics of high\|yield drip irrigated spring wheat in Yanqi area and its response mechanism to water and nitrogen interaction and clarify the water and nitrogen application rate of drip irrigated spring wheat in this area, ‘Xinchun 38’ and ‘Xinchun 45’ spring wheats were used as experimental materials. The split\|zone design was employed, with the main irrigation treatments including deficit irrigation (W1: 4 500 m3·hm-2) and optimal irrigation (W2: 6 000 m3·hm-2). Nitrogen application served as the secondary treatment, with levels of 0 (N0), 300 kg·hm-2 (N1), and 400 kg·hm-2 (N2). The dry matter accumulation and grain filling characteristics of leaves and stem sheaths in high\|yield drip\|irrigated spring wheat after flowering were compared and analyzed. The results showed that with the increase of nitrogen application rate， the dry matter accumulation, transfer amount, transfer rate and grain weight of stem sheath and leaf of the two varieties increased first and then decreased, and all of them were treated with W2N1 as the best, and the contribution rate was the best with W1N1. The end time of the rapid growth period (t2), the duration of the rapid growth period (t2-t1), the average grain filling rate (Vmean) and the maximum grain filling rate (Vmax) of the two varieties increased first and then decreased with the increase of nitrogen application rate, while the time of the rapid growth period (t1) decreased first and then increased, and the maximum grain filling rate time (tmax) continued to decrease. Correlation analysis showed that there was a significant positive correlation between stem sheath and leaf transfer amount, transfer rate, contribution rate, t2， t2-t1， Vmax and Vmean and grain weight, and the direct diameter coefficients between grain weight and average filling rate were 0.5354 and 0.5173, respectively, and 0.6752 and 0.6249， respectively, indicating that the effect of grain filling duration on grain weight was greater than that of average grain filling rate. In the production of drip irrigation spring wheat in Yanqi area, the dry matter accumulation and transport rate of stem sheaths and leaf treated of W2N1 (irrigation 6 000 m3·hm-2+nitrogen application 300 kg·hm-2) were the best, so it is recommended as a reasonable water and nitrogen supply mode in Yanqi area. |
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