Journal
JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION
Volume 21, Issue 3, Pages 2083-2095Publisher
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s42729-021-00504-1
Keywords
Leaf senescence; Drought tolerance; Nitrogen supply pattern; Partial root-zone irrigation (PRI); Zea mays
Categories
Funding
- National Natural Science Fund of China [51809006]
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The combination of alternate furrow irrigation with conventional nitrogen supply or alternate synchronized nitrogen supply enhances drought tolerance in maize by improving photosynthesis, antioxidant defense system, and osmoregulation, as demonstrated in the study.
Increasing drought stress resistance by exploiting crops' potential is crucial for agricultural sustainable development. Alternate partial root-zone irrigation (PRI) shows some benefits in coping with drought stress, but there is limited information on physiological mechanism of crop in response to nitrogen supply patterns under alternate PRI. Therefore, we designed a rainproof-pond study to determine the effects of nitrogen supply methods on the physiological characteristics of maize (Zea mays L.) under alternate PRI. Two nitrogen fertilizer supply methods, including alternate nitrogen supply (AN) and conventional nitrogen supply (CN), were applied with alternate furrow irrigation (AI) and conventional furrow irrigation (CI), respectively. In addition, AIAN was applied in two ways, namely AIANS (supply of N fertilizer and irrigation water in a synchronized manner) and AIAND (supply of N fertilizer and irrigation water in a separate manner). Compared to CICN, AICN and AIANS enhanced leaf water use efficiency with a significant increase in transpiration rate, while photosynthetic rate was comparable. Also, compared to AIAND, the AIANS positively affected the most measured physiological characteristics. Greater leaf relative water content, chlorophyll and soluble protein content, and the activities of peroxidases and superoxide dismutase enzymes were found in AIANS and AICN. Moreover, the contents of malondialdehyde, proline, and soluble sugar decreased which can be attributed to enhanced root vitality in AICN and AIANS. Alternate furrow irrigation combined with conventional nitrogen supply or alternate synchronized nitrogen supply enhances the drought tolerance of maize by improving photosynthesis, antioxidant defense system, and osmoregulation.
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