• ISSN 1008-505X
  • CN 11-3996/S
LIU Wen-huan, LI Sheng-nan, HOU Ge-ge, YANG Jia-heng, DUAN Jian-zhao, ZHU Yun-ji. Effects of foliar-spraying of different nutritional mixtures on stress tolerance to dry-hot wind and yield in winter wheat[J]. Journal of Plant Nutrition and Fertilizers, 2019, 25(9): 1600-1606. DOI: 10.11674/zwyf.18365
Citation: LIU Wen-huan, LI Sheng-nan, HOU Ge-ge, YANG Jia-heng, DUAN Jian-zhao, ZHU Yun-ji. Effects of foliar-spraying of different nutritional mixtures on stress tolerance to dry-hot wind and yield in winter wheat[J]. Journal of Plant Nutrition and Fertilizers, 2019, 25(9): 1600-1606. DOI: 10.11674/zwyf.18365

Effects of foliar-spraying of different nutritional mixtures on stress tolerance to dry-hot wind and yield in winter wheat

  • Objectives Dry-hot wind always happens in wheat growing areas, it is one of the main yield decreasing factors in wheat production of China. In this experiment, two nutritional mixtures were attempted for their effect on tolerance to dry-hot wind in the early grain filling stage of winter wheat.
    Methods A field experiment was conducted using wheat cultivar Guomai301 and Yunong816 as tested crops at the Science and Technology Demonstration Park of Henan Agricultural University. Five foliarspray treatments were designed, including CK (10 mg/kg Tween 80), A (0.2% zinc sulfate, 0.3% KH2PO4, 1% urea and 10 mg/kg Tween 80), B (0.02% oligochitosan added into A), C (0.1% marine polysaccharide added into A) and D (0.3% KH2PO4 and 10 mg/kg Tween 80). The green leaf number, SPAD and betaine content of flag leaves, grain filling rate and root activity were determined every 3 days from 9 to 28 of May during grain filling stage. Yield and yield components were investigated after harvest.
    Results Under dry-hot wind stress, compared to treatment A, treatment B and C could maintain more green leaves, enhanced flag leaf SPAD and betaine contents effectively, and the effect of B was significantly higher than that of C. Compared to CK, treatment A, B and C could increase root activities during grain filling stage, although the root activates were fluctuated. Foliar-spraying of nutritional mixtures could promote grain filling rate, and treatment B had the best effect. B performed better in promoting the filling rate of superior grains and C did better in that of inferior grains. Nutritional mixtures did not impact spike number per hectare and grain number per spike, but significantly improved the 1000-grain weight. Compared to CK, the 1000-grain weights of cultivar Yunong816 and Guomai301 were increased by 4.50%–12.4% and 3.44%–13.9%, and the yields by 3.24%–15.05% and 3.11%–31.38% as result. The yield increases were in order of B > C > A > D > CK, and the differences among the treatments were all significant.
    Conclusions Under dry-hot wind stress, the addition of oligochitosan and marine polysaccharide are proved of further improving the root activity, keeping more green functional leaves, and promoting the photosynthesis efficiency of flag leaves, which contributes to delaying leaf premature senescence, accelerating grain filling, increasing thousand grain weight and achieving the goal of increasing yield. Adding oligochitosan shows better effect than adding marine polysaccharide.
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