›› 2017, Vol. 29 ›› Issue (3): 353-359.DOI: 10.3969/j.issn.1004-1524.2017.03.01

• Crop Science •     Next Articles

Effects of spraying organic and inorganic nitrogen on physiological characteristics of rice in dry cultivation

WU Meiyan   

  1. College of Agriculture, Yangtze University/Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Jingzhou 434025, China
  • Received:2016-08-22 Online:2017-03-20 Published:2017-03-31

Abstract: A potted culture experiment was conducted to study the effects of organic and inorganic nitrogen on physiological characteristics of rice in dry cultivation, the results would provide a scientific basis for the application of organic nitrogen in rice production and the development of organic fertilizer. The effect of spraying ammonium sulphate (AS), glycine (Gly) and glutamine (Glu) on the leaf surface of rice (Oryza sativa L., Liangyoupeijiu) in dry cultivation under drought stress at the booting stage was evaluated with water-saving management (WSM) and distilled water (DW) as the control, and the chlorophyll content, protective enzymes, osmotic regulation matters, yield and protein content of rice were measured. The results showed that chlorophyll content and yield were decreased, and content of malondialdehyde (MDA) was increased obviously compared to WSM (P<0.05). After spraying AS, Gly and Glu, the chlorophyll content, superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) of flag leaves of rice in dry cultivation under drought stress were increased, and MDA content was decreased significantly. The osmotic regulators were enhanced, such as proline (Pro), total free amino acid (TFA) and the contents of soluble protein (SP). As a result, the yield and protein content of rice in dry cultivation were improved obviously (P<0.05). The increase of kernel numbers, 1000 grain yield and seed setting rate were the key point of harvesting higher yield for these treatments. Effects of AS and Gly were better than Glu, there was no significant difference between AS and Gly. Compared to DW, the yield and protein content of rice in dry cultivation were increased by 56.3% and 20.5% for AS and 44.2% and 22.0% for Gly. It suggested that spraying exogenous organic and inorganic nitrogen on rice in dry cultivation under drought stress could help rice keeping low peroxide contents and enhance rice resistance to drought by increasing activities of antioxidant enzymes and contents of osmotic regulators.

Key words: organic nitrogen, protective enzyme, osmotic regulation, rice in dry cultivation

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