Effects of Nitrogen and Potassium Reduction on Yield and Photosynthetic Characteristics of Double Cropping Rice by Astragalus sinicus and Late Rice Straw Returning

doi:10.7668/hbnxb.20190303

Abstract

Abstract: To explore the effect of nitrogen and potassium fertilizer reduction combined with Astragalus and straw returning on the yield and photosynthetic characteristics of double cropping rice. Field plot experiments were conducted to study the effects of Astragalus sinensis combined with late rice straw returning on yield,net photosynthetic rate(Pn),stomatal conductance(Gs),intercellular CO₂ concentration(Ci),transpiration rate(Tr)and chlorophyll content(SPAD)of double-cropping rice during panicle differentiation stage,soil physical and chemical properties by reducing 20%,30%,40% fertilizer nitrogen and 40% fertilizer potassium simultaneously. The results showed that the combination of different nitrogen fertilizer reducing ratio and the return of Astragalus sinensis and late rice straw could enhance rice photosynthesis,improve soil fertility and increase annual rice yield,and the effect of reducing 30% fertilizer nitrogen and 40% fertilizer potassium treatment(T4)was better. Compared with conventional fertilization treatment,the annual yield of rice T4 increased by 4.5%,early rice by 6.8%,Pn,Gs,Tr and SPAD values of the top three leaves decreased by 7.8%,23.9%,21.0% and 9.5%,Ci increased by 19.5%. The yield of late rice increased by 2.0%,Pn,Gs,Tr and SPAD values of the top three leaves increased by 27.0%,55.3%,14.8% and 13.4%,respectively,and Ci decreased by 1.6%. The contents of available phosphorus,available potassium and organic matter were all increased. The results are of great significance for guiding the reduction of fertilizer N and K application,the increase of rice yield and the improvement of fertility in double-cropping paddy fields with Astragalus sinensis and late rice straw returning.

Key words: Double cropping rice, Reduced application of fertilizer nitrogen and potassium, Returning Astragalus straw to field, Yield, Photosynthetic characteristics

CLC Number:

S147.2

HU Kexin, LUO Zunchang, DONG Chunhua, SUN Mei, HONG Xi, XIE Yi, ZHOU Xuan, LIU Jie, SUN Geng. Effects of Nitrogen and Potassium Reduction on Yield and Photosynthetic Characteristics of Double Cropping Rice by Astragalus sinicus and Late Rice Straw Returning[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(1): 141-148. doi: 10.7668/hbnxb.20190303.

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