ACTA AGRICULTURAE BOREALI-SINICA ›› 2020, Vol. 35 ›› Issue (5): 107-114. doi: 10.7668/hbnxb.20190392

Special Issue: Rice Soil fertilizer

• Tillage and Cultivation·Physiology and Biochemistry • Previous Articles     Next Articles

Study on Yield Change and Photosynthetic Characteristics of Double-cropping Rice under Organic Fertilizer Application and Straw Returning under Reduced Fertilizer Application

HU Kexin1,2, LUO Zunchang1,2, DONG Chunhua2, HONG Xi2, SUN Mei2, XIE Yi1,2, ZHOU Xuan2, LIU Jie2, SUN Geng2   

  1. 1. Long Ping Branch, Graduate School of Hunan University, Changsha 410125, China;
    2. Hunan Institute of Soil and Fertilizer, Changsha 410125, China
  • Received:2020-05-29 Published:2020-10-28

Abstract: In order to explore the yield change and photosynthetic characteristics of double cropping rice under the application of organic fertilizer and late rice straw. Field experiments were conducted to study the effects about reduction of 20%, 30% and 40% N fertilizer and 40% K fertilizer on the yield, Pn, Gs, Ci, Tr, SPAD and soil physical and chemical properties of double cropping rice. The results showed that reducing fertilizer nitrogen and fertilizer potassium in early and late rice could improve photosynthetic performance, soil physical and chemical properties and yield of double-cropping rice at the stage of young panicle differentiation. Compared with conventional fertilization, the annual yield of double-cropping rice increased by 6.0%, the yield of early rice increased by 7.5%, the Pn, Gs, Tr and SPAD of the first three leaves decreased by 6.8%, 22.4%, 14.6%, 11.0%, Ci increased by 17.6%, the yield of late rice increased by 4.4%, and the Pn, Gs, Tr and SPAD of the first three leaves increased by 18.5%, 31.9%, 8.6%, 22.4%, respectively, Ci decreased by 5.8%. Soil alkali-hydrolyzed nitrogen, available phosphorus, available potassium and organic matter contents increased during double cropping rice harvest. The results have important guiding significance for guiding the reduction of nitrogen and potassium fertilizer application in double cropping paddy field combined with late rice straw returning.

Key words: Double cropping rice, Fertilizer reduction, Commercial organic fertilizer, Late rice straw returning to field, Rice yield, Photosynthetic characteristics

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Cite this article

HU Kexin, LUO Zunchang, DONG Chunhua, HONG Xi, SUN Mei, XIE Yi, ZHOU Xuan, LIU Jie, SUN Geng. Study on Yield Change and Photosynthetic Characteristics of Double-cropping Rice under Organic Fertilizer Application and Straw Returning under Reduced Fertilizer Application[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(5): 107-114. doi: 10.7668/hbnxb.20190392.

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