Figures (4)  Tables (4)

    • Figure 1. 

      Development tendency of IRF in eight provinces over the past 10 years (data from the China Fishery Statistical Yearbook (2011−2020)).

    • Figure 2. 

      Change trend of rice planting area in Hubei province over the past 10 years (data from the Hubei Statistical Yearbook (2011-2020)).

    • Figure 3. 

      Relationship between total crayfish production and aquatic production of IRF in Hubei province over the past 10 years (data from the Hubei Rural Statistical Yearbook and the China Fishery Statistical Yearbook (2011-2020)).

    • Figure 4. 

      Change trend of rice planting area in Hainan province over the past 10 years (data from the Hainan Statistical Yearbook (2011-2020)).

    • ProvinceRice planting area (ha)IRF area (ha)Proportion of IRF area to
      rice planting area (%)
      Jiangsu2.18 × 1061.92 × 1058.80
      Anhui2.51 × 1062.72 × 10510.84
      Jiangxi3.35 × 1061.01 × 1053.02
      Hubei2.29 × 1064.60 × 10520.11
      Hunan3.86 × 1063.13 × 1058.12
      Sichuan1.87 × 1063.13 × 10516.73
      Guizhou6.65 × 1051.79 × 10526.98
      Yunnan8.42 × 1059.74 × 10411.57

      Table 1. 

      IRF area/rice planting area in eight provinces in 2019.

    • SeasonsGrain yield (t·ha−1)
      RMRCF (excluding culture ditch)RCF (including culture ditch)
      Early-season7.74 a6.83 b5.51 b
      Late-season3.45 b4.01 a3.24 b
      Within a row for each season, means followed by the different letters are significantly different from each other, while the means followed by the same letter are not, according to LSD (0.05).

      Table 2. 

      Comparison of grain yield in field trials.

    • SeasonsNPFP (kg·kg−1)
      RMRCF (excluding culture ditch)RCF (including culture ditch)
      Early-season64.47 b85.32 a68.92 b
      Late-season28.74 c50.13 a40.49 b
      Within a row for each season, means followed by the different letters are significantly different from each other, while the means followed by the same letter are not, according to LSD (0.05).

      Table 3. 

      Comparison of NPFP in field trials.

    • SeasonsEconomic benefits (CNY·ha−1)
      RMRCF (including
      culture ditch)
      Early-season23,208.42 b91,539.73 a
      Late-season10,345.68 b9,718.02 b
      Within a row for each season, means followed by the different letters are significantly different from each other, while the means followed by the same letter are not, according to LSD (0.05). Note: rice price was 3 CNY·kg−1, crayfish price was 50 CNY·kg−1.

      Table 4. 

      Economic benefit analysis of field trials.