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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2021, Vol. 43 ›› Issue (6): 1099-1107.doi: 10.19802/j.issn.1007-9084.2020233

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Effects of densities and planting mode on photosynthetic characteristics and yield of Cyperus esculentus during tuber growth stage

Peng ZHONG1(), Li-li MIAO1, Jie LIU1, Jian-li WANG2, Hai-yan LU1, Hong-jiu YU1, Nan ZHANG1   

  1. 1.Institute of Rural Energy & Environmental Protection, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China
    2.Institute of Pratacultural Science, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China
  • Received:2020-07-30 Online:2021-12-22 Published:2021-12-23

Abstract:

Crop yield is closely related to population structure, and rational population structure configuration is one of the effective ways to improve crop light energy utilization rate and increase yield. The effects of different population structures on photosynthetic characteristics and yield in tuber growth stage were studied to provide theoretical basis for further tapping yield potential of Cyperus esculentus in the midwestern of Heilongjiang Province. C. esculentus variety Heiyousha 2 was used as material in 2018. Three factors split-split plot design was used to study the effects of different population structures on photosynthetic characteristics and yield by analyzing canopy apparent photosynthetic (CAP), Chl(a+b) content, Fv/Fm and qP. The main plots was planting density with 90 000 plants/hm2 (A1), 110 000 plants/hm2 (A2), and 130 000 plants/hm2 (A3); split plot was planting way with 110 cm ridge 3 lines (B1), 65 cm ridge 2 lines (B2), and 45 cm ridge 1 line (B3). Split-split plot was seedling retention with rectangular (C1) and triangles (C2). Results showed that CAP increased with the planting density in tuber formative stage, and the differences among 3 treatments were significant (P< 0.05). CAP increased firstly and then decreased with the density in the middle stage of tuber growth and maturity stage. Chl(a+b) content, Fv/Fm and qP increased with the density in 0 d after tuber formative stage in canopy and lower leaves. Chl(a+b) content, Fv/Fm and qP increased firstly and then decreased with the density in 25-75 d after tuber formative stage. The changes of CAP, Chl (a+b) content, Fv/Fm and qP were in B2> B1 and B2> B3, the differences were significant (P< 0.05) under the same density and seedling retention way. The above indicators were C2>C1, the differences were significant (P< 0.05) under the same density and planting way. A2B1C2 treatment had the highest yield (7520.45 kg/hm2). Thus a reasonable planting density would be the key to increase C. esculentus yield. Under the appropriate density, reasonable wide-narrow row configuration and triangular seedling retention ways could effectively improve the population structure, CAP, Chl(a+b) content, Fv/Fm and qP, and thus would be an important way to achieve coordination between individual plants and the population, and to increase yield.

Key words: Cyperus esculentus, population structure, photosynthetic characteristics, yield

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