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Chinese Journal of Applied Ecology ›› 2020, Vol. 31 ›› Issue (11): 3749-3757.doi: 10.13287/j.1001-9332.202011.029

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Effects of organic fertilizer application on flag leaf C/N ratio, photosynthetic characteristics and yield of spring wheat with full plastic film mulching

YIN Jia-de, HOU Hui-zhi, ZHANG Xu-cheng*, WANG Hong-li, YU Xian-feng, FANG Yan-jie, MA Yi-fan, ZHANG Guo-ping, LEI Kang-ning   

  1. Institute of Dry-land Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China
  • Received:2020-06-22 Accepted:2020-09-01 Online:2020-11-15 Published:2021-06-10
  • Contact: * E-mail: gszhangxuch@163.com
  • Supported by:
    the National Key Research and Development Program of China (2018YFD0200403), the National Natural Science Foundation of China (31560355), the Agricultural Science and Technology Innovation Project of the Gansu Academy of Agricultural Sciences (2017GAAS27), and the Key Research and Development Program of Gansu Province (18YF1WA092).

Abstract: A field experiment was conducted in the rain-fed semi-arid region of central Gansu in 2016 and 2017, with the treatments 1) hill-drop flat planting with full plastic film mulching (PMS), 2) hill-drop flat planting with full plastic film mulching plus organic fertilizers (PMO), and 3) hill-drop flat planting without soil mulching (CK). We investigated the relations among soil moisture, photosynthetic rate (Pn), stomatal conductance (gs) and transpiration rate (Tr), C/N ratio, and total nitrogen of flag leaf from the heading stage to the seed-filling stage in different treatments to probe into their effects on the yield and yield components of spring wheat variety ‘Longchun 27'. The results showed that organic fertilizer application could increase soil moisture at the middle and late growth stages of spring wheat. PMO increased soil water storage in 0-300 cm depth from the heading stage to the seed filling stage by 4.6% and 8.5%, decreased population canopy temperature by 0.1-1.3 ℃ and 1.4-4.9 ℃, increased net photosynthetic rate of flag leaf by 9.3% and 29.7%, stomatal conductance by 30.9% and 103.8%, transpiration rate by 5.1% and 55.0%, total nitrogen content by 6.6% and 18.9%, and decreased C/N ratio by 6.4% and 22.8%, respectively. Compared with PMS and CK, PMO significantly improved grain number per spike and 1000-grain weight, and increased grain yield by 9.1% and 53.7%, respectively. From the heading stage to filling stage, the Pn and gs of flag leaf had negative correlation with C/N, while C/N was negatively correlated with grain yield. Consequently, PMO could improve soil water storage and promote photosynthesis of flag leaf, reduce the intensity of physiological drought stress and the limitations of nitrogen absorption and assimilation in flag leaf from the heading stage to the seed-filling stage, and increase grain number and grain weight and consequently the yield of spring wheat in semi-arid region.

Key words: full plastic film mulching, organic fertilizer, soil moisture, photosynthetic characteristics, flag leaf C/N ratio