Acta Agriculturae Boreali-Sinica ›› 2023, Vol. 38 ›› Issue (4): 167-173. doi: 10.7668/hbnxb.20193836

Special Issue: Wheat

• Resources & Environment·Plant Protection • Previous Articles     Next Articles

Effects of Water-Limited Irrigation Period on Decay of Each Leaf Layer and Population Photosynthesis of Winter Wheat

HE Lu, ZHANG Liru, YANG Ruoqian, YANG Xi, DU Yufan, ZHENG Boyan, LI Ruiqi, WANG Hongguang   

  1. College of Agronomy,Hebei Agricultural University,State Key Laboratory of North China Crop Improvement and Regulation,Key Laboratory of Crop Growth Regulation of Hebei Province,Baoding 071001,China
  • Received:2023-03-20 Published:2023-08-28

Abstract:

In order to determine the optimal irrigation period of winter wheat under the condition of limited irrigation in spring and reduce the adverse effects of water restriction on the individual and population quality of wheat,five irrigation treatments,that irrigation at the 2nd,3rd,4th,5th and 6th spring leaf occurring stage(T2—T6)respective,were set.No irrigation treatment(W0)in the whole growth season was set as control.The Gaoyou 2018,a multi-panicle winter wheat variety was used.The effects of irrigation period on leaf area index(LAI)and SPAD of each leaf layer,canopy apparent photosynthetic rate after anthesis, dry matter accumulation and transportation, and yield were studied.The results showed that under the condition of only irrigation once in spring,the decay rate of canopy LAI by T5 and T6 decreased by 58.93% and 14.37% during 0—10 days and 20—30 days after anthesis,respectively,than that by irrigation at the 2nd, 3rd and 4th spring leaf occurring stage.The decay rate of LAI and SPAD of the top 3rd,4th and 5th leaf layers by T5 or T6 were lower significantly during 0—10 days after anthesis,and the decay rate of the flag leaf and top 2nd leaf layers by T5 or T6 were lower during 20—30 days after anthesis.Compared to early irrigation treatment, when irrigation was delayed to the 5th or 6th spring leaf age, the canopy apparent photosynthetic rate was increased by 19.89%,35.86% and 56.08%,respectively during the early,middle and late grain filling stage,the post-anthesis dry matter accumulation amount and the translocation amount from dry matter pre-anthesis to grains were both increased.The final grain yield and harvest index increased by 9.73% and 18.64%,respectively.In conclusion,under the condition of only irrigation once in spring of this study,irrigation at the 5th or 6th leaf age in spring was beneficial to delay leaf decay and increase population photosynthetic capacity and grain yield of wheat.

Key words: Winter wheat, Irrigation period, Leaf area index, Population photosynthetic rate, Accumulation and translocation of dry matter

Cite this article

HE Lu, ZHANG Liru, YANG Ruoqian, YANG Xi, DU Yufan, ZHENG Boyan, LI Ruiqi, WANG Hongguang. Effects of Water-Limited Irrigation Period on Decay of Each Leaf Layer and Population Photosynthesis of Winter Wheat[J]. Acta Agriculturae Boreali-Sinica, 2023, 38(4): 167-173. doi: 10.7668/hbnxb.20193836.

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