| Effect of water stress and foliar\|applied humic acid on physiological properties and yield formation of naked oats |
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| DOI：10.7606/j.issn.1000-7601.2020.05.11 |
| Key Words: naked oat water stress humic acid drought resistance yield formation |
| Author Name | Affiliation | | ZHAO Baoping | College of Agronomy,Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China | | HAN Wenyuan | College of Agronomy,Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China | | SUN Wen | College of Agronomy,Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China | | WU Junying | College of Agronomy,Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China | | LIU Jinghui | College of Agronomy,Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China |
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| Abstract: |
| Under the condition of rain\|proof shelter and using naked oats ‘Neiyan 5’as material, we conducted a pot cultivated experiment to test the effects of different water treatments (45% and 75% of field water capacity, FWC), and foliar\|applied humic acid (HA) and water (WT) at jointing, heading and grain\|filling stages on plant leaf morphological, physiological indices and grain yield components. The research was to clarify which growth stageis suitable for applying HA based on drought resistance and yield improvement, and to provide a theory on oats high\|yielding and drought\|resistant cultivation. The results showed that under 45% of FWC and foliar\|applied HA, the relative chlorophyll content (SPAD) in leaves was 16.7%, 7.0%, and 15.1% higher than that of WT treatment at jointing, heading and grain\|filling stage, respectively; the POD activity was 14.1%, 16.7%, and 6.3% higher than that of WT treatment, and the MDA content was 20.3%, 11.2%, and 7.8% lower than that of WT treatment, respectively (P<0.05). Under 45% and 75% of FWC, the proline content (Pro) both increased when spraying HA;the value under 45% of FWC was significantly higher than that of 75% of FWC, and reached the maximum at heading stage. Under 45% of FWC, the number of spikelet per panicle was increased significantly when spraying HA at jointing stage, while the grain number per panicle and 1000-grain weight significantly increased when spraying HA at heading stage, and the grain weight increased by more than 10% (P<0.05). Under 75% of FWC, the grain number per panicle increased significantly, and the grain weight increased most at heading stage. In summary, under water stress, spraying HA at the jointing and heading stages could significantly improve photosynthetic capacity, enhance antioxidant enzyme activity and osmotic regulation ability, thus promoting grain development and improving yield. In practice, it is recommended that spraying HA at the jointing and heading stages under drought conditions, and at the heading stage under sufficient water conditions. |
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